source: branches/3140_NumberSymbol/HeuristicLab.ExtLibs/HeuristicLab.EPPlus/4.0.3/EPPlus-4.0.3/ExcelRangeBase.cs @ 18190

/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 * See the GNU Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied. 
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 * 
 * Author             Change            Date
 * ******************************************************************************
 * Jan Källman        Initial Release           2010-01-28
 * Jan Källman        License changed GPL-->LGPL  2011-12-27
 * Eyal Seagull       Conditional Formatting      2012-04-03
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Data;
using OfficeOpenXml.FormulaParsing;
using OfficeOpenXml.Style;
using System.Xml;
using System.Drawing;
using System.Globalization;
using System.Collections;
using OfficeOpenXml.Table;
using System.Text.RegularExpressions;
using System.IO;
using System.Linq;
using OfficeOpenXml.DataValidation;
using OfficeOpenXml.DataValidation.Contracts;
using System.Reflection;
using OfficeOpenXml.Style.XmlAccess;
using System.Security;
using OfficeOpenXml.ConditionalFormatting;
using OfficeOpenXml.ConditionalFormatting.Contracts;
using OfficeOpenXml.FormulaParsing.LexicalAnalysis;
namespace OfficeOpenXml
{ 
    /// <summary>
  /// A range of cells 
  /// </summary>
  public class ExcelRangeBase : ExcelAddress, IExcelCell, IEnumerable<ExcelRangeBase>
  {
    /// <summary>
    /// Reference to the worksheet
    /// </summary>
    protected ExcelWorksheet _worksheet;
    internal ExcelWorkbook _workbook = null;
    private delegate void _changeProp(_setValue method, object value);
    private delegate void _setValue(object value, int row, int col);
    private _changeProp _changePropMethod;
    private int _styleID;
        private class CopiedCell
        {
            internal int Row { get; set; }
            internal int Column { get; set; }
            internal object Value { get; set; }
            internal string Type { get; set; }
            internal object Formula { get; set; }
            internal int? StyleID { get; set; }
            internal Uri HyperLink { get; set; }
            internal ExcelComment Comment { get; set; }
            internal Byte Flag { get; set; }
        }
        //private class CopiedFlag
        //{
        //    internal int Row { get; set; }
        //    internal int Column { get; set; }
        //    internal Byte Flag { get; set; }
        //}
        #region Constructors
    internal ExcelRangeBase(ExcelWorksheet xlWorksheet)
    {
      _worksheet = xlWorksheet;
      _ws = _worksheet.Name;
            _workbook = _worksheet.Workbook;
            this.AddressChange += new EventHandler(ExcelRangeBase_AddressChange);
      SetDelegate();
    }

        void ExcelRangeBase_AddressChange(object sender, EventArgs e)
        {
            if (Table != null)
            {
                SetRCFromTable(_workbook._package, null);
            }
            SetDelegate();
        }
    internal ExcelRangeBase(ExcelWorksheet xlWorksheet, string address) :
      base(xlWorksheet == null ? "" : xlWorksheet.Name, address)
    {
      _worksheet = xlWorksheet;
            _workbook = _worksheet.Workbook;
            base.SetRCFromTable(_worksheet._package, null);
      if (string.IsNullOrEmpty(_ws)) _ws = _worksheet == null ? "" : _worksheet.Name;
            this.AddressChange += new EventHandler(ExcelRangeBase_AddressChange);
            SetDelegate();
    }
    internal ExcelRangeBase(ExcelWorkbook wb, ExcelWorksheet xlWorksheet, string address, bool isName) :
      base(xlWorksheet == null ? "" : xlWorksheet.Name, address, isName)
    {
            SetRCFromTable(wb._package, null);
            _worksheet = xlWorksheet;
      _workbook = wb;
      if (string.IsNullOrEmpty(_ws)) _ws = (xlWorksheet == null ? null : xlWorksheet.Name);
            this.AddressChange += new EventHandler(ExcelRangeBase_AddressChange);
            SetDelegate();
    }
        ~ExcelRangeBase()
        {
            this.AddressChange -= new EventHandler(ExcelRangeBase_AddressChange);
        }
    #endregion
    #region Set Value Delegates
        private void SetDelegate()
    {
      if (_fromRow == -1)
      {
        _changePropMethod = SetUnknown;
      }
      //Single cell
      else if (_fromRow == _toRow && _fromCol == _toCol && Addresses == null)
      {
        _changePropMethod = SetSingle;
      }
      //Range (ex A1:A2)
      else if (Addresses == null)
      {
        _changePropMethod = SetRange;
      }
      //Multi Range (ex A1:A2,C1:C2)
      else
      {
        _changePropMethod = SetMultiRange;
      }
    }
        /// <summary>
    /// We dont know the address yet. Set the delegate first time a property is set.
    /// </summary>
    /// <param name="valueMethod"></param>
    /// <param name="value"></param>
    private void SetUnknown(_setValue valueMethod, object value)
    {
      //Address is not set use, selected range
      if (_fromRow == -1)
      {
        SetToSelectedRange();
      }
      SetDelegate();
      _changePropMethod(valueMethod, value);
    }
    /// <summary>
    /// Set a single cell
    /// </summary>
    /// <param name="valueMethod"></param>
    /// <param name="value"></param>
    private void SetSingle(_setValue valueMethod, object value)
    {
      valueMethod(value, _fromRow, _fromCol);
    }
    /// <summary>
    /// Set a range
    /// </summary>
    /// <param name="valueMethod"></param>
    /// <param name="value"></param>
    private void SetRange(_setValue valueMethod, object value)
    {
      SetValueAddress(this, valueMethod, value);
    }
    /// <summary>
    /// Set a multirange (A1:A2,C1:C2)
    /// </summary>
    /// <param name="valueMethod"></param>
    /// <param name="value"></param>
    private void SetMultiRange(_setValue valueMethod, object value)
    {
      SetValueAddress(this, valueMethod, value);
      foreach (var address in Addresses)
      {
        SetValueAddress(address, valueMethod, value);
      }
    }
    /// <summary>
    /// Set the property for an address
    /// </summary>
    /// <param name="address"></param>
    /// <param name="valueMethod"></param>
    /// <param name="value"></param>
    private void SetValueAddress(ExcelAddress address, _setValue valueMethod, object value)
    {
      IsRangeValid("");
      if (_fromRow == 1 && _fromCol == 1 && _toRow == ExcelPackage.MaxRows && _toCol == ExcelPackage.MaxColumns)  //Full sheet (ex ws.Cells.Value=0). Set value for A1 only to avoid hanging 
      {
        throw (new ArgumentException("Can't reference all cells. Please use the indexer to set the range"));
      }
      else
      {
        for (int col = address.Start.Column; col <= address.End.Column; col++)
        {
          for (int row = address.Start.Row; row <= address.End.Row; row++)
          {
            valueMethod(value, row, col);
          }
        }
      }
    }
    #endregion
    #region Set property methods
    private void Set_StyleID(object value, int row, int col)
    {
            _worksheet._styles.SetValue(row, col, (int)value);
    }
    private void Set_StyleName(object value, int row, int col)
    {
      //_worksheet.Cell(row, col).SetNewStyleName(value.ToString(), _styleID);
            _worksheet._styles.SetValue(row, col, _styleID);
    }
    private void Set_Value(object value, int row, int col)
    {
      //ExcelCell c = _worksheet.Cell(row, col);
            var sfi = _worksheet._formulas.GetValue(row, col);
            if (sfi is int)
            {
                SplitFormulas(_worksheet.Cells[row, col]);                
            }
            if (sfi != null) _worksheet._formulas.SetValue(row, col, string.Empty);
      _worksheet._values.SetValue(row, col, value);
    }
    private void Set_Formula(object value, int row, int col)
    {
      //ExcelCell c = _worksheet.Cell(row, col);
            var f = _worksheet._formulas.GetValue(row, col);
            if (f is int && (int)f >= 0) SplitFormulas(_worksheet.Cells[row, col]);

      string formula = (value == null ? string.Empty : value.ToString());
      if (formula == string.Empty)
      {
                _worksheet._formulas.SetValue(row, col, string.Empty);
      }
      else
      {
        if (formula[0] == '=') value = formula.Substring(1, formula.Length - 1); // remove any starting equalsign.
                _worksheet._formulas.SetValue(row, col, formula);
                _worksheet._values.SetValue(row, col, null);
            }
    }
    /// <summary>
    /// Handles shared formulas
    /// </summary>
    /// <param name="value">The  formula</param>
    /// <param name="address">The address of the formula</param>
    /// <param name="IsArray">If the forumla is an array formula.</param>
    private void Set_SharedFormula(string value, ExcelAddress address, bool IsArray)
    {
      if (_fromRow == 1 && _fromCol == 1 && _toRow == ExcelPackage.MaxRows && _toCol == ExcelPackage.MaxColumns)  //Full sheet (ex ws.Cells.Value=0). Set value for A1 only to avoid hanging 
      {
        throw (new InvalidOperationException("Can't set a formula for the entire worksheet"));
      }
      else if (address.Start.Row == address.End.Row && address.Start.Column == address.End.Column && !IsArray)             //is it really a shared formula? Arrayformulas can be one cell only
      {
        //Nope, single cell. Set the formula
        Set_Formula(value, address.Start.Row, address.Start.Column);
        return;
      }
      //RemoveFormuls(address);
      CheckAndSplitSharedFormula(address);
      ExcelWorksheet.Formulas f = new ExcelWorksheet.Formulas(SourceCodeTokenizer.Default);
      f.Formula = value;
      f.Index = _worksheet.GetMaxShareFunctionIndex(IsArray);
      f.Address = address.FirstAddress;
      f.StartCol = address.Start.Column;
      f.StartRow = address.Start.Row;
      f.IsArray = IsArray;

      _worksheet._sharedFormulas.Add(f.Index, f);
            //_worksheet.Cell(address.Start.Row, address.Start.Column).SharedFormulaID = f.Index;
            //_worksheet.Cell(address.Start.Row, address.Start.Column).Formula = value;

      for (int col = address.Start.Column; col <= address.End.Column; col++)
      {
        for (int row = address.Start.Row; row <= address.End.Row; row++)
        {
          //_worksheet.Cell(row, col).SharedFormulaID = f.Index;
                    _worksheet._formulas.SetValue(row, col, f.Index);
                    _worksheet._values.SetValue(row, col, null);
        }
      }
    }
    private void Set_HyperLink(object value, int row, int col)
    {
      //_worksheet.Cell(row, col).Hyperlink = value as Uri;
            if (value is Uri)
            {
                _worksheet._hyperLinks.SetValue(row, col, (Uri)value);

                if (value is ExcelHyperLink)
                {
                    _worksheet._values.SetValue(row, col, ((ExcelHyperLink)value).Display);
                }
                else
                {
                   _worksheet._values.SetValue(row, col, ((Uri)value).OriginalString);
                }                    
            }
            else
            {
                _worksheet._hyperLinks.SetValue(row, col, (Uri)null);
                _worksheet._values.SetValue(row, col, (Uri)null);
            }
        }
    private void Set_IsRichText(object value, int row, int col)
    {
      //_worksheet.Cell(row, col).IsRichText = (bool)value;
            _worksheet._flags.SetFlagValue(row, col, (bool)value, CellFlags.RichText);
    }
    private void Exists_Comment(object value, int row, int col)
    {
      ulong cellID = GetCellID(_worksheet.SheetID, row, col);
      if (_worksheet.Comments._comments.ContainsKey(cellID))
      {
        throw (new InvalidOperationException(string.Format("Cell {0} already contain a comment.", new ExcelCellAddress(row, col).Address)));
      }

    }
    private void Set_Comment(object value, int row, int col)
    {
      string[] v = (string[])value;
      Worksheet.Comments.Add(new ExcelRangeBase(_worksheet, GetAddress(_fromRow, _fromCol)), v[0], v[1]);
      //   _worksheet.Cell(row, col).Comment = comment;
    }
    #endregion
    private void SetToSelectedRange()
    {
      if (_worksheet.View.SelectedRange == "")
      {
        Address = "A1";
      }
      else
      {
        Address = _worksheet.View.SelectedRange;
      }
    }
    private void IsRangeValid(string type)
    {
      if (_fromRow <= 0)
      {
        if (_address == "")
        {
          SetToSelectedRange();
        }
        else
        {
          if (type == "")
          {
            throw (new InvalidOperationException(string.Format("Range is not valid for this operation: {0}", _address)));
          }
          else
          {
            throw (new InvalidOperationException(string.Format("Range is not valid for {0} : {1}", type, _address)));
          }
        }
      }
    }
    #region Public Properties
    /// <summary>
    /// The styleobject for the range.
    /// </summary>
    public ExcelStyle Style
    {
      get
      {
        IsRangeValid("styling");
                int s=0;
                if(!_worksheet._styles.Exists(_fromRow,_fromCol, ref s)) //Cell exists
                {
                    if(!_worksheet._styles.Exists(_fromRow,0, ref s)) //No, check Row style
                    {
                        var c = Worksheet.GetColumn(_fromCol);
                        if (c == null)
                        {
                            s = 0;
                        }
                        else
                        {
                            s = c.StyleID;   
                        }                        
                    }
                }
        return _worksheet.Workbook.Styles.GetStyleObject(s, _worksheet.PositionID, Address);
      }
    }
    /// <summary>
    /// The named style
    /// </summary>
    public string StyleName
    {
      get
      {
        IsRangeValid("styling");
        int  xfId;
                if (_fromRow == 1 && _toRow == ExcelPackage.MaxRows)
                {
                    xfId=GetColumnStyle(_fromCol);
                }
                else if (_fromCol == 1 && _toCol == ExcelPackage.MaxColumns)
                {
                    xfId = 0;
                    if (!_worksheet._styles.Exists(_fromRow, 0, ref xfId))
                    {
                        xfId = GetColumnStyle(_fromCol);
                    }
                }
                else
                {
                    xfId = 0;
                    if(!_worksheet._styles.Exists(_fromRow, _fromCol, ref xfId))
                    {
                        if (!_worksheet._styles.Exists(_fromRow, 0, ref xfId))
                        {
                            xfId = GetColumnStyle(_fromCol);
                        }
                    }
                }
                int nsID;
                if (xfId <= 0)
                {
                    nsID=Style.Styles.CellXfs[0].XfId;
                }
                else
                {
                    nsID=Style.Styles.CellXfs[xfId].XfId;
                }
                foreach (var ns in Style.Styles.NamedStyles)
                {
                    if (ns.StyleXfId == nsID)
                    {
                        return ns.Name;
                    }
                }
                
                return "";
      }
      set
      {
        _styleID = _worksheet.Workbook.Styles.GetStyleIdFromName(value);
                int col = _fromCol;
                if (_fromRow == 1 && _toRow == ExcelPackage.MaxRows)    //Full column
        {
          ExcelColumn column;
          //Get the startcolumn
          //ulong colID = ExcelColumn.GetColumnID(_worksheet.SheetID, column);
                    var c = _worksheet.GetValue(0, _fromCol);
                    if (c==null)
          {
                        column = _worksheet.Column(_fromCol);
                        //if (_worksheet._values.PrevCell(ref row, ref col))
                        //{
                        //    var prevCol = (ExcelColumn)_worksheet._values.GetValue(row, col);
                        //    column = prevCol.Clone(_worksheet, column);
                        //    prevCol.ColumnMax = column - 1;
                        //}
          }
          else
          {
                        column = (ExcelColumn)c;
          }

                    column.StyleName = value;
                    column.StyleID = _styleID;

                    //var index = _worksheet._columns.IndexOf(colID);
                    var cols = new CellsStoreEnumerator<object>(_worksheet._values, 0, _fromCol + 1, 0, _toCol);
                    if (cols.Next())
                    {
                        col = _fromCol;
                        while (column.ColumnMin <= _toCol)
                        {
                            if (column.ColumnMax > _toCol)
                            {
                                var newCol = _worksheet.CopyColumn(column, _toCol + 1, column.ColumnMax);
                                column.ColumnMax = _toCol;
                            }

                            column._styleName = value;
                            column.StyleID = _styleID;

                            if (cols.Value == null)
                            {
                                break;
                            }
                            else
                            {
                                var nextCol = (ExcelColumn)cols.Value;
                                if(column.ColumnMax < nextCol.ColumnMax-1)
                                {
                                    column.ColumnMax = nextCol.ColumnMax - 1;
                                }
                                column = nextCol;
                                cols.Next();
                            }
                        }
                    }
                    if (column.ColumnMax < _toCol)
                    {
                        column.ColumnMax = _toCol;
                    }
                    //if (column.ColumnMin == column)
                    //{
                    //    column.ColumnMax = _toCol;
                    //}
                    //else if (column._columnMax < _toCol)
                    //{
                    //    var newCol = _worksheet.Column(column._columnMax + 1) as ExcelColumn;
                    //    newCol._columnMax = _toCol;

                    //    newCol._styleID = _styleID;
                    //    newCol._styleName = value;
                    //}
                    if (_fromCol == 1 && _toCol == ExcelPackage.MaxColumns) //FullRow
                    {
                        var rows = new CellsStoreEnumerator<object>(_worksheet._values, 1, 0, ExcelPackage.MaxRows, 0);
                        rows.Next();
                        while(rows.Value!=null)
                        {
                            _worksheet._styles.SetValue(rows.Row, 0, _styleID);
                            if (!rows.Next())
                            {
                                break;
                            }
                        }
                    }
        }
                else if (_fromCol == 1 && _toCol == ExcelPackage.MaxColumns) //FullRow
                {
                    for (int r = _fromRow; r <= _toRow; r++)
                    {
                        _worksheet.Row(r)._styleName = value;
                        _worksheet.Row(r).StyleID = _styleID;
                    }
                }

                if (!((_fromRow == 1 && _toRow == ExcelPackage.MaxRows) || (_fromCol == 1 && _toCol == ExcelPackage.MaxColumns))) //Cell specific
                {
                    for (int c = _fromCol; c <= _toCol; c++)
                    {
                        for (int r = _fromRow; r <= _toRow; r++)
                        {
                            _worksheet._styles.SetValue(r, c, _styleID);
                        }
                    }
                }
                else //Only set name on created cells. (uncreated cells is set on full row or full column).
                {
                    var cells = new CellsStoreEnumerator<object>(_worksheet._values, _fromRow, _fromCol, _toRow, _toCol);
                    while (cells.Next())
                    {
                        _worksheet._styles.SetValue(cells.Row, cells.Column, _styleID);
                    }
                }
                //_changePropMethod(Set_StyleName, value);
      }
    }

        private int GetColumnStyle(int col)
        {
            object c=null;
            if (_worksheet._values.Exists(0, col, ref c))
            {
                return (c as ExcelColumn).StyleID;
            }
            else
            {
                int row = 0;
                if (_worksheet._values.PrevCell(ref row, ref col))
                {
                    var column=_worksheet._values.GetValue(row,col) as ExcelColumn;
                    if(column.ColumnMax>=col)
                    {
                        return _worksheet._styles.GetValue(row, col);
                    }
                }
            }
            return 0;
        }
    /// <summary>
    /// The style ID. 
    /// It is not recomended to use this one. Use Named styles as an alternative.
    /// If you do, make sure that you use the Style.UpdateXml() method to update any new styles added to the workbook.
    /// </summary>
    public int StyleID
    {
      get
      {
                int s=0;
                if(!_worksheet._styles.Exists(_fromRow, _fromCol, ref s))
                {
                    if (!_worksheet._styles.Exists(_fromRow, 0, ref s))
                    {
                        s = _worksheet._styles.GetValue(0, _fromCol);
                    }
                }
                return s;
      }
      set
      {
        _changePropMethod(Set_StyleID, value);
      }
    }
    /// <summary>
    /// Set the range to a specific value
    /// </summary>
    public object Value
    {
      get
      {
        if (IsName)
        {
          if (_worksheet == null)
          {
            return _workbook._names[_address].NameValue;
          }
          else
          {
            return _worksheet.Names[_address].NameValue; 
          }
        }
        else
        {
          if (_fromRow == _toRow && _fromCol == _toCol)
          {
            return _worksheet.GetValue(_fromRow, _fromCol);
          }
          else
          {
            return GetValueArray();
          }
        }
      }
      set
      {
        if (IsName)
        {
          if (_worksheet == null)
          {
            _workbook._names[_address].NameValue = value;
          }
          else
          {
            _worksheet.Names[_address].NameValue = value;
          }
        }
        else
        {
          _changePropMethod(Set_Value, value);
        }
      }
    }

        private bool IsInfinityValue(object value)
        {
            double? valueAsDouble = value as double?;

            if(valueAsDouble.HasValue && 
                (double.IsNegativeInfinity(valueAsDouble.Value) || double.IsPositiveInfinity(valueAsDouble.Value)))
            {
                return true;
            }

            return false;
        }

    private object GetValueArray()
    {
      ExcelAddressBase addr;
      if (_fromRow == 1 && _fromCol == 1 && _toRow == ExcelPackage.MaxRows && _toCol == ExcelPackage.MaxColumns)
      {
        addr = _worksheet.Dimension;
        if (addr == null) return null;
      }
      else
      {
        addr = this;
      }
      object[,] v = new object[addr._toRow - addr._fromRow + 1, addr._toCol - addr._fromCol + 1];

      for (int col = addr._fromCol; col <= addr._toCol; col++)
      {
        for (int row = addr._fromRow; row <= addr._toRow; row++)
        {
          if (_worksheet._values.Exists(row,col))
          {
            if (IsRichText)
            {
              v[row - addr._fromRow, col - addr._fromCol] = GetRichText(row, col).Text;
            }
            else
            {
              v[row - addr._fromRow, col - addr._fromCol] = _worksheet._values.GetValue(row, col);
            }
          }
        }
      }
      return v;
    }
    private ExcelAddressBase GetAddressDim(ExcelRangeBase addr)
    {
      int fromRow, fromCol, toRow, toCol;
      var d = _worksheet.Dimension;
      fromRow = addr._fromRow < d._fromRow ? d._fromRow : addr._fromRow;
      fromCol = addr._fromCol < d._fromCol ? d._fromCol : addr._fromCol;

      toRow = addr._toRow > d._toRow ? d._toRow : addr._toRow;
      toCol = addr._toCol > d._toCol ? d._toCol : addr._toCol;

      if (addr._fromCol == fromRow && addr._fromCol == addr._fromCol && addr._toRow == toRow && addr._toCol == _toCol)
      {
        return addr;
      }
      else
      {
        if (_fromRow > _toRow || _fromCol > _toCol)
        {
          return null;
        }
        else
        {
          return new ExcelAddressBase(fromRow, fromCol, toRow, toCol);
        }
      }
    }

    private object GetSingleValue()
    {
      if (IsRichText)
      {
        return RichText.Text;
      }
      else
      {
        return _worksheet._values.GetValue(_fromRow, _fromCol);
      }
    }
    /// <summary>
    /// Returns the formatted value.
    /// </summary>
    public string Text
    {
      get
      {
        return GetFormattedText(false);
      }
    }
    /// <summary>
    /// Set the column width from the content of the range. The minimum width is the value of the ExcelWorksheet.defaultColumnWidth property.
    /// Note: Cells containing formulas are ignored since EPPlus don't have a calculation engine.
    /// Wrapped and merged cells are also ignored.
    /// </summary>
    public void AutoFitColumns()
    {
      AutoFitColumns(_worksheet.DefaultColWidth);
    }

    /// <summary>
    /// Set the column width from the content of the range.
    /// Note: Cells containing formulas are ignored if no calculation is made.
    ///       Wrapped and merged cells are also ignored.
    /// </summary>
        /// <remarks>This method will not work if you run in an environment that does not support GDI</remarks>
    /// <param name="MinimumWidth">Minimum column width</param>
    public void AutoFitColumns(double MinimumWidth)
    {
        AutoFitColumns(MinimumWidth, double.MaxValue);
    }

      /// <summary>
      /// Set the column width from the content of the range.
        /// Note: Cells containing formulas are ignored if no calculation is made.
        ///       Wrapped and merged cells are also ignored.
      /// </summary>
      /// <param name="MinimumWidth">Minimum column width</param>
      /// <param name="MaximumWidth">Maximum column width</param>
      public void AutoFitColumns(double MinimumWidth, double MaximumWidth)
    {
            if (_worksheet.Dimension == null)
            {
                return;
            }
            if (_fromCol < 1 || _fromRow < 1)
      {
        SetToSelectedRange();
      }
            var fontCache = new Dictionary<int, Font>();

          bool doAdjust = _worksheet._package.DoAdjustDrawings;
      _worksheet._package.DoAdjustDrawings = false;
      var drawWidths = _worksheet.Drawings.GetDrawingWidths();

      var fromCol = _fromCol > _worksheet.Dimension._fromCol ? _fromCol : _worksheet.Dimension._fromCol;
      var toCol = _toCol < _worksheet.Dimension._toCol ? _toCol : _worksheet.Dimension._toCol;
      if (Addresses == null)
      {
        SetMinWidth(MinimumWidth, fromCol, toCol);
      }
      else
      {
        foreach (var addr in Addresses)
        {
          fromCol = addr._fromCol > _worksheet.Dimension._fromCol ? addr._fromCol : _worksheet.Dimension._fromCol;
          toCol = addr._toCol < _worksheet.Dimension._toCol ? addr._toCol : _worksheet.Dimension._toCol;
                    SetMinWidth(MinimumWidth, fromCol, toCol);
                }
      }

      //Get any autofilter to widen these columns
      var afAddr = new List<ExcelAddressBase>();
      if (_worksheet.AutoFilterAddress != null)
      {
        afAddr.Add(new ExcelAddressBase(    _worksheet.AutoFilterAddress._fromRow,
                          _worksheet.AutoFilterAddress._fromCol,
                          _worksheet.AutoFilterAddress._fromRow,
                          _worksheet.AutoFilterAddress._toCol));
        afAddr[afAddr.Count - 1]._ws = WorkSheet;
      }
      foreach (var tbl in _worksheet.Tables)
      {
        if (tbl.AutoFilterAddress != null)
        {
          afAddr.Add(new ExcelAddressBase(tbl.AutoFilterAddress._fromRow,
                                      tbl.AutoFilterAddress._fromCol,
                                      tbl.AutoFilterAddress._fromRow,
                                      tbl.AutoFilterAddress._toCol));
          afAddr[afAddr.Count - 1]._ws = WorkSheet;
        }
      }

      var styles = _worksheet.Workbook.Styles;
      var nf = styles.Fonts[styles.CellXfs[0].FontId];
      var fs = FontStyle.Regular;
      if (nf.Bold) fs |= FontStyle.Bold;
      if (nf.UnderLine) fs |= FontStyle.Underline;
      if (nf.Italic) fs |= FontStyle.Italic;
      if (nf.Strike) fs |= FontStyle.Strikeout;
      var nfont = new Font(nf.Name, nf.Size, fs);
            
      using (var b = new Bitmap(1, 1))
      {
        using (var g = Graphics.FromImage(b))
        {
          var normalSize = (float)Math.Truncate(g.MeasureString("00", nfont).Width - g.MeasureString("0", nfont).Width);
          g.PageUnit = GraphicsUnit.Pixel;
          foreach (var cell in this)
          {
            if (cell.Merge == true || cell.Style.WrapText) continue;
            var fntID = styles.CellXfs[cell.StyleID].FontId;
              Font f;
              if (fontCache.ContainsKey(fntID))
            {
              f = fontCache[fntID];
            }
            else
            {
              var fnt = styles.Fonts[fntID];
              fs = FontStyle.Regular;
              if (fnt.Bold) fs |= FontStyle.Bold;
              if (fnt.UnderLine) fs |= FontStyle.Underline;
              if (fnt.Italic) fs |= FontStyle.Italic;
              if (fnt.Strike) fs |= FontStyle.Strikeout;
              f = new Font(fnt.Name, fnt.Size, fs);
              fontCache.Add(fntID, f);
            }

            //Truncate(({pixels}-5)/{Maximum Digit Width} * 100+0.5)/100

                        var size = g.MeasureString(cell.TextForWidth, f);
                        double width;
                        double r = styles.CellXfs[cell.StyleID].TextRotation;
                        if (r <= 0 )
                        {
                            width = (size.Width + 5) / normalSize;
                        }
                        else
                        {
                            r = (r <= 90 ? r : r - 90);
                            width = (((size.Width - size.Height) * Math.Abs(System.Math.Cos(System.Math.PI * r / 180.0)) + size.Height) + 5) / normalSize;
                        }

            foreach (var a in afAddr)
            {
              if (a.Collide(cell) != eAddressCollition.No)
              {
                width += 2.25;
                break;
              }
            }

            if (width > _worksheet.Column(cell._fromCol).Width)
            {
              _worksheet.Column(cell._fromCol).Width = width > MaximumWidth ? MaximumWidth : width;
            }
          }
        }
      }
      _worksheet.Drawings.AdjustWidth(drawWidths);
      _worksheet._package.DoAdjustDrawings = doAdjust;
    }

        private void SetMinWidth(double minimumWidth, int fromCol, int toCol)
        {
            var iterator = new CellsStoreEnumerator<object>(_worksheet._values, 0, fromCol, 0, toCol);
            var prevCol = fromCol;
            foreach (ExcelColumn col in iterator)
            {
                col.Width = minimumWidth;
                if (_worksheet.DefaultColWidth > minimumWidth && col.ColumnMin > prevCol)
                {
                    var newCol = _worksheet.Column(prevCol);
                    newCol.ColumnMax = col.ColumnMin - 1;
                    newCol.Width = minimumWidth;
                }
                prevCol = col.ColumnMax + 1;
            }
            if (_worksheet.DefaultColWidth > minimumWidth && prevCol<toCol)
            {
                var newCol = _worksheet.Column(prevCol);
                newCol.ColumnMax = toCol;
                newCol.Width = minimumWidth;
            }
        }

        internal string TextForWidth
    {
      get
      {
        return GetFormattedText(true);
      }
    }
    private string GetFormattedText(bool forWidthCalc)
    {
      object v = Value;
      if (v == null) return "";
      var styles = Worksheet.Workbook.Styles;
      var nfID = styles.CellXfs[StyleID].NumberFormatId;
      ExcelNumberFormatXml.ExcelFormatTranslator nf = null;
      for (int i = 0; i < styles.NumberFormats.Count; i++)
      {
        if (nfID == styles.NumberFormats[i].NumFmtId)
        {
          nf = styles.NumberFormats[i].FormatTranslator;
          break;
        }
      }

      string format, textFormat;
      if (forWidthCalc)
      {
        format = nf.NetFormatForWidth;
        textFormat = nf.NetTextFormatForWidth;
      }
      else
      {
        format = nf.NetFormat;
        textFormat = nf.NetTextFormat;
      }

            return FormatValue(v, nf, format, textFormat);
    }

        internal static string FormatValue(object v, ExcelNumberFormatXml.ExcelFormatTranslator nf, string format, string textFormat)
        {
      if (v is decimal || v.GetType().IsPrimitive)
      {
        double d;
        try
        {
          d = Convert.ToDouble(v);
        }
        catch
        {
          return "";
        }

        if (nf.DataType == ExcelNumberFormatXml.eFormatType.Number)
        {
          if (string.IsNullOrEmpty(nf.FractionFormat))
          {
            return d.ToString(format, nf.Culture);
          }
          else
          {
            return nf.FormatFraction(d);
          }
        }
        else if (nf.DataType == ExcelNumberFormatXml.eFormatType.DateTime)
        {
          var date = DateTime.FromOADate(d);
          return date.ToString(format, nf.Culture);
        }
      }
      else if (v is DateTime)
      {
        if (nf.DataType == ExcelNumberFormatXml.eFormatType.DateTime)
        {
          return ((DateTime)v).ToString(format, nf.Culture);
        }
        else
        {
          double d = ((DateTime)v).ToOADate();
          if (string.IsNullOrEmpty(nf.FractionFormat))
          {
            return d.ToString(format, nf.Culture);
          }
          else
          {
            return nf.FormatFraction(d);
          }
        }
      }
      else if (v is TimeSpan)
      {
        if (nf.DataType == ExcelNumberFormatXml.eFormatType.DateTime)
        {
          return new DateTime(((TimeSpan)v).Ticks).ToString(format, nf.Culture);
        }
        else
        {
          double d = (new DateTime(((TimeSpan)v).Ticks)).ToOADate();
          if (string.IsNullOrEmpty(nf.FractionFormat))
          {
            return d.ToString(format, nf.Culture);
          }
          else
          {
            return nf.FormatFraction(d);
          }
        }
      }
      else
      {
        if (textFormat == "")
        {
          return v.ToString();
        }
        else
        {
          return string.Format(textFormat, v);
        }
      }
      return v.ToString();
}
    /// <summary>
    /// Gets or sets a formula for a range.
    /// </summary>
    public string Formula
    {
      get
      {
        if (IsName)
        {
          if (_worksheet == null)
          {
            return _workbook._names[_address].NameFormula;
          }
          else
          {
            return _worksheet.Names[_address].NameFormula;
          }
        }
        else
        {
          return _worksheet.GetFormula(_fromRow, _fromCol);                    
        }
      }
      set
      {
        if (IsName)
        {
          if (_worksheet == null)
          {
            _workbook._names[_address].NameFormula = value;
          }
          else
          {
            _worksheet.Names[_address].NameFormula = value;
          }
        }
        else
        {
          if(value==null || value.Trim()=="")
                    {
                        //Set the cells to null
                        Value = null;
                    }                    
                    else if (_fromRow == _toRow && _fromCol == _toCol)
          {
            Set_Formula(value, _fromRow, _fromCol);
          }
          else
          {
            Set_SharedFormula(value, this, false);
            if (Addresses != null)
            {
              foreach (var address in Addresses)
              {
                Set_SharedFormula(value, address, false);
              }
            }
          }
        }
      }
    }
    /// <summary>
    /// Gets or Set a formula in R1C1 format.
    /// </summary>
    public string FormulaR1C1
    {
      get
      {
        IsRangeValid("FormulaR1C1");
        return _worksheet.GetFormulaR1C1(_fromRow, _fromCol);
      }
      set
      {
        IsRangeValid("FormulaR1C1");
                if (value.Length > 0 && value[0] == '=') value = value.Substring(1, value.Length - 1); // remove any starting equalsign.

                if (value == null || value.Trim() == "")
                {
                    //Set the cells to null
                    _worksheet.Cells[ExcelCellBase.TranslateFromR1C1(value, _fromRow, _fromCol)].Value = null;    
                }
        else if (Addresses == null)
        {
          Set_SharedFormula(ExcelCellBase.TranslateFromR1C1(value, _fromRow, _fromCol), this, false);
        }
        else
        {
          Set_SharedFormula(ExcelCellBase.TranslateFromR1C1(value, _fromRow, _fromCol), new ExcelAddress(WorkSheet, FirstAddress), false);
          foreach (var address in Addresses)
          {
            Set_SharedFormula(ExcelCellBase.TranslateFromR1C1(value, address.Start.Row, address.Start.Column), address, false);
          }
        }
      }
    }
    /// <summary>
    /// Set the hyperlink property for a range of cells
    /// </summary>
    public Uri Hyperlink
    {
      get
      {
        IsRangeValid("formulaR1C1");
        return _worksheet._hyperLinks.GetValue(_fromRow, _fromCol);
      }
      set
      {
        _changePropMethod(Set_HyperLink, value);
      }
    }
    /// <summary>
    /// If the cells in the range are merged.
    /// </summary>
    public bool Merge
    {
      get
      {
        IsRangeValid("merging");
        for (int col = _fromCol; col <= _toCol; col++)
        {
          for (int row = _fromRow; row <= _toRow; row++)
          {
                        if(_worksheet.MergedCells[row, col]==null)
                        {
                            return false;
                        }
                        //if (!_worksheet._flags.GetFlagValue(row, col, CellFlags.Merged))
                        //{
                        //    return false;
                        //}
          }
        }
        return true;
      }
      set
      {
        IsRangeValid("merging");
        //SetMerge(value, FirstAddress);
          if (value)
          {
              _worksheet.MergedCells.Add(new ExcelAddressBase(FirstAddress), true);
              if (Addresses != null)
              {
                  foreach (var address in Addresses)
                  {
                      _worksheet.MergedCells.Add(address, true);
                      //SetMerge(value, address._address);
                  }
              }
          }
          else
          {
              _worksheet.MergedCells.Delete(this);
                    if (Addresses != null)
              {
                  foreach (var address in Addresses)
                  {
                            _worksheet.MergedCells.Delete(address); ;
                  }
              }
              
          }
      }
    }

        //private void SetMerge(bool value, string address)
        //{
        //    if (!value)
        //    {
        //        if (_worksheet.MergedCells.List.Contains(address))
        //        {
        //            SetCellMerge(false, address);
        //            _worksheet.MergedCells.List.Remove(address);
        //        }
        //        else if (!CheckMergeDiff(false, address))
        //        {
        //            throw (new Exception("Range is not fully merged.Specify the exact range"));
        //        }
        //    }
        //    else
        //    {
        //        if (CheckMergeDiff(false, address))
        //        {
        //            SetCellMerge(true, address);
        //            _worksheet.MergedCells.List.Add(address);
        //        }
        //        else
        //        {
        //            if (!_worksheet.MergedCells.List.Contains(address))
        //            {
        //                throw (new Exception("Cells are already merged"));
        //            }
        //        }
        //    }
        //}
    /// <summary>
    /// Set an autofilter for the range
    /// </summary>
    public bool AutoFilter
    {
      get
      {
        IsRangeValid("autofilter");
        ExcelAddressBase address = _worksheet.AutoFilterAddress;
        if (address == null) return false;
        if (_fromRow >= address.Start.Row
            &&
            _toRow <= address.End.Row
            &&
            _fromCol >= address.Start.Column
            &&
            _toCol <= address.End.Column)
        {
          return true;
        }
        return false;
      }
      set
      {
        IsRangeValid("autofilter");
        _worksheet.AutoFilterAddress = this;
        if (_worksheet.Names.ContainsKey("_xlnm._FilterDatabase"))
        {
          _worksheet.Names.Remove("_xlnm._FilterDatabase");
        }
        var result = _worksheet.Names.Add("_xlnm._FilterDatabase", this);
        result.IsNameHidden = true;
      }
    }
    /// <summary>
    /// If the value is in richtext format.
    /// </summary>
    public bool IsRichText
    {
      get
      {
        IsRangeValid("richtext");
        return _worksheet._flags.GetFlagValue(_fromRow, _fromCol,CellFlags.RichText);
      }
      set
      {
        _changePropMethod(Set_IsRichText, value);
      }
    }
    /// <summary>
    /// Is the range a part of an Arrayformula
    /// </summary>
    public bool IsArrayFormula
    {
      get
      {
        IsRangeValid("arrayformulas");
                return _worksheet._flags.GetFlagValue(_fromRow, _fromCol, CellFlags.ArrayFormula);
      }
    }
    ExcelRichTextCollection _rtc = null;
    /// <summary>
    /// Cell value is richtext formated. 
    /// </summary>
    public ExcelRichTextCollection RichText
    {
      get
      {
        IsRangeValid("richtext");
        if (_rtc == null)
        {
          _rtc = GetRichText(_fromRow, _fromCol);
        }
        return _rtc;
      }
    }

    private ExcelRichTextCollection GetRichText(int row, int col)
    {
      XmlDocument xml = new XmlDocument();
            var v = _worksheet._values.GetValue(row, col);
            var isRt = _worksheet._flags.GetFlagValue(row, col, CellFlags.RichText);
            if (v != null)
      {
        if (isRt)
        {
                    XmlHelper.LoadXmlSafe(xml, "<d:si xmlns:d=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\" >" + v.ToString() + "</d:si>", Encoding.UTF8);
        }
        else
        {
          xml.LoadXml("<d:si xmlns:d=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\" ><d:r><d:t>" + SecurityElement.Escape(v.ToString()) + "</d:t></d:r></d:si>");
        }
      }
      else
      {
        xml.LoadXml("<d:si xmlns:d=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\" />");
      }
      var rtc = new ExcelRichTextCollection(_worksheet.NameSpaceManager, xml.SelectSingleNode("d:si", _worksheet.NameSpaceManager), this);
            if (rtc.Count == 1 && isRt == false)
      {
        IsRichText = true;
                var s = _worksheet._styles.GetValue(row, col);
                //var fnt = cell.Style.Font;
                var fnt = _worksheet.Workbook.Styles.GetStyleObject(s, _worksheet.PositionID, ExcelAddressBase.GetAddress(row, col)).Font;
        rtc[0].PreserveSpace = true;
        rtc[0].Bold = fnt.Bold;
        rtc[0].FontName = fnt.Name;
        rtc[0].Italic = fnt.Italic;
        rtc[0].Size = fnt.Size;
        rtc[0].UnderLine = fnt.UnderLine;

        int hex;
        if (fnt.Color.Rgb != "" && int.TryParse(fnt.Color.Rgb, NumberStyles.HexNumber, null, out hex))
        {
          rtc[0].Color = Color.FromArgb(hex);
        }

      }
      return rtc;
    }
    /// <summary>
    /// returns the comment object of the first cell in the range
    /// </summary>
    public ExcelComment Comment
    {
      get
      {
        IsRangeValid("comments");
        ulong cellID = GetCellID(_worksheet.SheetID, _fromRow, _fromCol);
        if (_worksheet.Comments._comments.ContainsKey(cellID))
        {
          return _worksheet._comments._comments[cellID] as ExcelComment;
        }
        return null;
      }
    }
    /// <summary>
    /// WorkSheet object 
    /// </summary>
    public ExcelWorksheet Worksheet
    {
      get
      {
        return _worksheet;
      }
    }
    /// <summary>
    /// Address including sheetname
    /// </summary>
    public string FullAddress
    {
      get
      {
        string fullAddress = GetFullAddress(_worksheet.Name, _address);
        if (Addresses != null)
        {
          foreach (var a in Addresses)
          {
            fullAddress += "," + GetFullAddress(_worksheet.Name, a.Address); ;
          }
        }
        return fullAddress;
      }
    }
    /// <summary>
    /// Address including sheetname
    /// </summary>
    public string FullAddressAbsolute
    {
      get
      {
        string wbwsRef = string.IsNullOrEmpty(base._wb) ? base._ws : "[" + base._wb.Replace("'", "''") + "]" + _ws;
        string fullAddress = GetFullAddress(wbwsRef, GetAddress(_fromRow, _fromCol, _toRow, _toCol, true));
        if (Addresses != null)
        {
          foreach (var a in Addresses)
          {
            fullAddress += "," + GetFullAddress(wbwsRef, GetAddress(a.Start.Row, a.Start.Column, a.End.Row, a.End.Column, true)); ;
          }
        }
        return fullAddress;
      }
    }
        /// <summary>
        /// Address including sheetname
        /// </summary>
        internal string FullAddressAbsoluteNoFullRowCol
        {
            get
            {
                string wbwsRef = string.IsNullOrEmpty(base._wb) ? base._ws : "[" + base._wb.Replace("'", "''") + "]" + _ws;
                string fullAddress = GetFullAddress(wbwsRef, GetAddress(_fromRow, _fromCol, _toRow, _toCol, true), false);
                if (Addresses != null)
                {
                    foreach (var a in Addresses)
                    {
                        fullAddress += "," + GetFullAddress(wbwsRef, GetAddress(a.Start.Row, a.Start.Column, a.End.Row, a.End.Column, true),false); ;
                    }
                }
                return fullAddress;
            }
        }
    #endregion
    #region Private Methods
        ///// <summary>
        ///// Check if the range is partly merged
        ///// </summary>
        ///// <param name="startValue">the starting value</param>
        ///// <param name="address">the address</param>
        ///// <returns></returns>
        //private bool CheckMergeDiff(bool startValue, string address)
        //{
        //    ExcelAddress a = new ExcelAddress(address);
        //    for (int col = a.column; col <= a._toCol; col++)
        //    {
        //        for (int row = a._fromRow; row <= a._toRow; row++)
        //        {
        //            if (_worksheet._flags.GetFlagValue(row, col, CellFlags.Merged) != startValue)
        //            {
        //                return false;
        //            }
        //        }
        //    }
        //    return true;
        //}
        ///// <summary>
        ///// Set the merge flag for the range
        ///// </summary>
        ///// <param name="value"></param>
        ///// <param name="address"></param>
        //internal void SetCellMerge(bool value, string address)
        //{
        //    ExcelAddress a = new ExcelAddress(address);
        //    for (int col = a.column; col <= a._toCol; col++)
        //    {
        //        for (int row = a._fromRow; row <= a._toRow; row++)
        //        {
        //            _worksheet._flags.SetFlagValue(row, col,value,CellFlags.Merged);
        //        }
        //    }
        //}
    /// <summary>
    /// Set the value without altering the richtext property
    /// </summary>
    /// <param name="value">the value</param>
    internal void SetValueRichText(object value)
    {
      if (_fromRow == 1 && _fromCol == 1 && _toRow == ExcelPackage.MaxRows && _toCol == ExcelPackage.MaxColumns)  //Full sheet (ex ws.Cells.Value=0). Set value for A1 only to avoid hanging 
      {
        //_worksheet.Cell(1, 1).SetValueRichText(value);
                SetValue(value, 1, 1);
      }
      else
      {
        for (int col = _fromCol; col <= _toCol; col++)
        {
          for (int row = _fromRow; row <= _toRow; row++)
          {
            //_worksheet.Cell(row, col).SetValueRichText(value);
                        SetValue(value, row,col);
          }
        }
      }
    }

        private void SetValue(object value, int row, int col)
        {
            _worksheet.SetValue(row, col, value);
           // if (value is string) _worksheet._types.SetValue(row, col, "S"); else _worksheet._types.SetValue(row, col, "");
            _worksheet._formulas.SetValue(row, col, "");
        }
    /// <summary>
    /// Removes a shared formula
    /// </summary>
        //private void RemoveFormuls(ExcelAddress address)
        //{
        //    List<int> removed = new List<int>();
        //    int fFromRow, fFromCol, fToRow, fToCol;
        //    foreach (int index in _worksheet._sharedFormulas.Keys)
        //    {
        //        ExcelWorksheet.Formulas f = _worksheet._sharedFormulas[index];
        //        ExcelCellBase.GetRowColFromAddress(f.Address, out fFromRow, out fFromCol, out fToRow, out fToCol);
        //        if (((fFromCol >= address.Start.Column && fFromCol <= address.End.Column) ||
        //             (fToCol >= address.Start.Column && fToCol <= address.End.Column)) &&
        //             ((fFromRow >= address.Start.Row && fFromRow <= address.End.Row) ||
        //             (fToRow >= address.Start.Row && fToRow <= address.End.Row)))
        //        {
        //            for (int col = fFromCol; col <= fToCol; col++)
        //            {
        //                for (int row = fFromRow; row <= fToRow; row++)
        //                {
        //                    _worksheet._formulas.SetValue(row, col, int.MinValue);
        //                }
        //            }
        //            removed.Add(index);
        //        }
        //    }
        //    foreach (int index in removed)
        //    {
        //        _worksheet._sharedFormulas.Remove(index);
        //    }
        //}
    internal void SetSharedFormulaID(int id)
    {
      for (int col = _fromCol; col <= _toCol; col++)
      {
        for (int row = _fromRow; row <= _toRow; row++)
        {
                    _worksheet._formulas.SetValue(row, col, id);
        }
      }
    }
    private void CheckAndSplitSharedFormula(ExcelAddressBase address)
    {
            for (int col = address._fromCol; col <= address._toCol; col++)
      {
                for (int row = address._fromRow; row <= address._toRow; row++)
        {
                    var f = _worksheet._formulas.GetValue(row, col);
                    if (f is int && (int)f >= 0)
          {
            SplitFormulas(address);
            return;
          }
        }
      }
    }

    private void SplitFormulas(ExcelAddressBase address)
    {
      List<int> formulas = new List<int>();
            for (int col = address._fromCol; col <= address._toCol; col++)
      {
                for (int row = address._fromRow; row <= address._toRow; row++)
        {
          var f = _worksheet._formulas.GetValue(row, col);
                    if (f is int)
                    {
                        int id = (int)f;
                        if (id >= 0 && !formulas.Contains(id))
                        {
                            if (_worksheet._sharedFormulas[id].IsArray &&
                                    Collide(_worksheet.Cells[_worksheet._sharedFormulas[id].Address]) == eAddressCollition.Partly) // If the formula is an array formula and its on the inside the overwriting range throw an exception
                            {
                                throw (new InvalidOperationException("Can not overwrite a part of an array-formula"));
                            }
                            formulas.Add(id);
                        }
                    }                    
        }
      }

      foreach (int ix in formulas)
      {
                SplitFormula(address, ix);
      }
        
            ////Delete any formula references inside the refered range
            //_worksheet._formulas.Delete(address._fromRow, address._toRow, address._toRow - address._fromRow + 1, address._toCol - address.column + 1);
        }

    private void SplitFormula(ExcelAddressBase address, int ix)
    {
      var f = _worksheet._sharedFormulas[ix];
      var fRange = _worksheet.Cells[f.Address];
            var collide = address.Collide(fRange);

            //The formula is inside the currenct range, remove it
      if (collide == eAddressCollition.Equal || collide == eAddressCollition.Inside)
      {
        _worksheet._sharedFormulas.Remove(ix);
                return;
        //fRange.SetSharedFormulaID(int.MinValue); 
      }
            var firstCellCollide = address.Collide(new ExcelAddressBase(fRange._fromRow, fRange._fromCol, fRange._fromRow, fRange._fromCol));
            if (collide == eAddressCollition.Partly && (firstCellCollide == eAddressCollition.Inside || firstCellCollide == eAddressCollition.Equal)) //Do we need to split? Only if the functions first row is inside the new range.
            {
                //The formula partly collides with the current range
                bool fIsSet = false;
                string formulaR1C1 = fRange.FormulaR1C1;
                //Top Range
                if (fRange._fromRow < _fromRow)
                {
                    f.Address = ExcelCellBase.GetAddress(fRange._fromRow, fRange._fromCol, _fromRow - 1, fRange._toCol);
                    fIsSet = true;
                }
                //Left Range
                if (fRange._fromCol < address._fromCol)
                {
                    if (fIsSet)
                    {
                        f = new ExcelWorksheet.Formulas(SourceCodeTokenizer.Default);
                        f.Index = _worksheet.GetMaxShareFunctionIndex(false);
                        f.StartCol = fRange._fromCol;
                        f.IsArray = false;
                        _worksheet._sharedFormulas.Add(f.Index, f);
                    }
                    else
                    {
                        fIsSet = true;
                    }
                    if (fRange._fromRow < address._fromRow)
                        f.StartRow = address._fromRow;
                    else
                    {
                        f.StartRow = fRange._fromRow;
                    }
                    if (fRange._toRow < address._toRow)
                    {
                        f.Address = ExcelCellBase.GetAddress(f.StartRow, f.StartCol,
                                fRange._toRow, address._fromCol - 1);
                    }
                    else
                    {
                        f.Address = ExcelCellBase.GetAddress(f.StartRow, f.StartCol,
                             address._toRow, address._fromCol - 1);
                    }
                    f.Formula = TranslateFromR1C1(formulaR1C1, f.StartRow, f.StartCol);
                    _worksheet.Cells[f.Address].SetSharedFormulaID(f.Index);
                }
                //Right Range
                if (fRange._toCol > address._toCol)
                {
                    if (fIsSet)
                    {
                        f = new ExcelWorksheet.Formulas(SourceCodeTokenizer.Default);
                        f.Index = _worksheet.GetMaxShareFunctionIndex(false);
                        f.IsArray = false;
                        _worksheet._sharedFormulas.Add(f.Index, f);
                    }
                    else
                    {
                        fIsSet = true;
                    }
                    f.StartCol = address._toCol + 1;
                    if (address._fromRow < fRange._fromRow)
                        f.StartRow = fRange._fromRow;
                    else
                    {
                        f.StartRow = address._fromRow;
                    }

                    if (fRange._toRow < address._toRow)
                    {
                        f.Address = ExcelCellBase.GetAddress(f.StartRow, f.StartCol,
                                fRange._toRow, fRange._toCol);
                    }
                    else
                    {
                        f.Address = ExcelCellBase.GetAddress(f.StartRow, f.StartCol,
                                address._toRow, fRange._toCol);
                    }
                    f.Formula = TranslateFromR1C1(formulaR1C1, f.StartRow, f.StartCol);
                    _worksheet.Cells[f.Address].SetSharedFormulaID(f.Index);
                }
                //Bottom Range
                if (fRange._toRow > address._toRow)
                {
                    if (fIsSet)
                    {
                        f = new ExcelWorksheet.Formulas(SourceCodeTokenizer.Default);
                        f.Index = _worksheet.GetMaxShareFunctionIndex(false);
                        f.IsArray = false;
                        _worksheet._sharedFormulas.Add(f.Index, f);
                    }

                    f.StartCol = fRange._fromCol;
                    f.StartRow = _toRow + 1;

                    f.Formula = TranslateFromR1C1(formulaR1C1, f.StartRow, f.StartCol);

                    f.Address = ExcelCellBase.GetAddress(f.StartRow, f.StartCol,
                            fRange._toRow, fRange._toCol);
                    _worksheet.Cells[f.Address].SetSharedFormulaID(f.Index);

                }
            }
    }
    private object ConvertData(ExcelTextFormat Format, string v, int col, bool isText)
    {
      if (isText && (Format.DataTypes == null || Format.DataTypes.Length < col)) return v;

      double d;
      DateTime dt;
      if (Format.DataTypes == null || Format.DataTypes.Length <= col || Format.DataTypes[col] == eDataTypes.Unknown)
      {
        string v2 = v.EndsWith("%") ? v.Substring(0, v.Length - 1) : v;
        if (double.TryParse(v2, NumberStyles.Any, Format.Culture, out d))
        {
          if (v2 == v)
          {
            return d;
          }
          else
          {
            return d / 100;
          }
        }
        if (DateTime.TryParse(v, Format.Culture, DateTimeStyles.None, out dt))
        {
          return dt;
        }
        else
        {
          return v;
        }
      }
      else
      {
        switch (Format.DataTypes[col])
        {
          case eDataTypes.Number:
            if (double.TryParse(v, NumberStyles.Any, Format.Culture, out d))
            {
              return d;
            }
            else
            {
              return v;
            }
          case eDataTypes.DateTime:
            if (DateTime.TryParse(v, Format.Culture, DateTimeStyles.None, out dt))
            {
              return dt;
            }
            else
            {
              return v;
            }
          case eDataTypes.Percent:
            string v2 = v.EndsWith("%") ? v.Substring(0, v.Length - 1) : v;
            if (double.TryParse(v2, NumberStyles.Any, Format.Culture, out d))
            {
              return d / 100;
            }
            else
            {
              return v;
            }

          default:
            return v;

        }
      }
    }
    #endregion
    #region Public Methods
    #region ConditionalFormatting
    /// <summary>
    /// Conditional Formatting for this range.
    /// </summary>
    public IRangeConditionalFormatting ConditionalFormatting
    {
      get
      {
        return new RangeConditionalFormatting(_worksheet, new ExcelAddress(Address));
      }
    }
    #endregion
    #region DataValidation
    /// <summary>
    /// Data validation for this range.
    /// </summary>
    public IRangeDataValidation DataValidation
    {
      get
      {
                return new RangeDataValidation(_worksheet, Address);
      }
    }
    #endregion
        #region LoadFromDataReader
      /// <summary>
      /// Load the data from the datareader starting from the top left cell of the range
      /// </summary>
      /// <param name="Reader">The datareader to loadfrom</param>
      /// <param name="PrintHeaders">Print the column caption property (if set) or the columnname property if not, on first row</param>
      /// <param name="TableName">The name of the table</param>
      /// <param name="TableStyle">The table style to apply to the data</param>
      /// <returns>The filled range</returns>
      public ExcelRangeBase LoadFromDataReader(IDataReader Reader, bool PrintHeaders, string TableName, TableStyles TableStyle = TableStyles.None)
      {
          var r = LoadFromDataReader(Reader, PrintHeaders);

            int rows = r.Rows - 1;
          if (rows >= 0 && r.Columns > 0)
          {
              var tbl = _worksheet.Tables.Add(new ExcelAddressBase(_fromRow, _fromCol, _fromRow + (rows <= 0 ? 1 : rows), _fromCol + r.Columns - 1), TableName);
              tbl.ShowHeader = PrintHeaders;
              tbl.TableStyle = TableStyle;
          }
          return r;
      }

      /// <summary>
      /// Load the data from the datareader starting from the top left cell of the range
      /// </summary>
      /// <param name="Reader">The datareader to load from</param>
      /// <param name="PrintHeaders">Print the caption property (if set) or the columnname property if not, on first row</param>
      /// <returns>The filled range</returns>
      public ExcelRangeBase LoadFromDataReader(IDataReader Reader, bool PrintHeaders)
      {
          if (Reader == null)
          {
              throw (new ArgumentNullException("Reader", "Reader can't be null"));
          }
          int fieldCount = Reader.FieldCount;
    
          int col = _fromCol, row = _fromRow;
          if (PrintHeaders)
          {
              for (int i = 0; i < fieldCount; i++)
              {
                  // If no caption is set, the ColumnName property is called implicitly.
                  _worksheet._values.SetValue(row, col++, Reader.GetName(i));
              }
              row++;
              col = _fromCol;
          }
          while(Reader.Read())
          {
              for (int i = 0; i < fieldCount; i++)
              {
                  _worksheet._values.SetValue(row, col++, Reader.GetValue(i));
              }
              row++;
              col = _fromCol;
          }
          return _worksheet.Cells[_fromRow, _fromCol, row - 1, _fromCol + fieldCount - 1];
      }
      #endregion
    #region LoadFromDataTable
    /// <summary>
    /// Load the data from the datatable starting from the top left cell of the range
    /// </summary>
    /// <param name="Table">The datatable to load</param>
    /// <param name="PrintHeaders">Print the column caption property (if set) or the columnname property if not, on first row</param>
    /// <param name="TableStyle">The table style to apply to the data</param>
    /// <returns>The filled range</returns>
    public ExcelRangeBase LoadFromDataTable(DataTable Table, bool PrintHeaders, TableStyles TableStyle)
    {
      var r = LoadFromDataTable(Table, PrintHeaders);

            int rows = (Table.Rows.Count == 0 ? 1 : Table.Rows.Count) + (PrintHeaders ? 1 : 0);
            if (rows >= 0 && Table.Columns.Count>0)
      {
                var tbl = _worksheet.Tables.Add(new ExcelAddressBase(_fromRow, _fromCol, _fromRow + rows - 1, _fromCol + Table.Columns.Count-1), Table.TableName);
        tbl.ShowHeader = PrintHeaders;
        tbl.TableStyle = TableStyle;
      }
        return r;
    }
    /// <summary>
    /// Load the data from the datatable starting from the top left cell of the range
    /// </summary>
    /// <param name="Table">The datatable to load</param>
    /// <param name="PrintHeaders">Print the caption property (if set) or the columnname property if not, on first row</param>
    /// <returns>The filled range</returns>
    public ExcelRangeBase LoadFromDataTable(DataTable Table, bool PrintHeaders)
    {
      if (Table == null)
      {
        throw (new ArgumentNullException("Table can't be null"));
      }

      int col = _fromCol, row = _fromRow;
      if (PrintHeaders)
      {
        foreach (DataColumn dc in Table.Columns)
        {
                    // If no caption is set, the ColumnName property is called implicitly.
          _worksheet._values.SetValue(row, col++, dc.Caption);
        }
        row++;
        col = _fromCol;
      }
      foreach (DataRow dr in Table.Rows)
      {
        foreach (object value in dr.ItemArray)
        {
                    if (value != null && value != DBNull.Value && !string.IsNullOrEmpty(value.ToString()))
                    {
                        _worksheet._values.SetValue(row, col++, value);
                    }
                    else
                    {
                        col++;
                    }
                }
        row++;
        col = _fromCol;
      }
            return _worksheet.Cells[_fromRow, _fromCol, (row == _fromRow ? _fromRow : row - 1), _fromCol + Table.Columns.Count - 1];
    }
    #endregion
    #region LoadFromArrays
    /// <summary>
    /// Loads data from the collection of arrays of objects into the range, starting from
    /// the top-left cell.
    /// </summary>
    /// <param name="Data">The data.</param>
    public ExcelRangeBase LoadFromArrays(IEnumerable<object[]> Data)
    {
      //thanx to Abdullin for the code contribution
      if (Data == null) throw new ArgumentNullException("data");

      int column = _fromCol, row = _fromRow;

      foreach (var rowData in Data)
      {
        column = _fromCol;
        foreach (var cellData in rowData)
        {
          _worksheet._values.SetValue(row, column, cellData);
          column += 1;
        }
        row += 1;
      }
      return _worksheet.Cells[_fromRow, _fromCol, row - 1, column - 1];
    }
    #endregion
    #region LoadFromCollection
    /// <summary>
    /// Load a collection into a the worksheet starting from the top left row of the range.
    /// </summary>
    /// <typeparam name="T">The datatype in the collection</typeparam>
    /// <param name="Collection">The collection to load</param>
    /// <returns>The filled range</returns>
    public ExcelRangeBase LoadFromCollection<T>(IEnumerable<T> Collection)
    {
      return LoadFromCollection<T>(Collection, false, TableStyles.None, BindingFlags.Public | BindingFlags.Instance, null);
    }
    /// <summary>
    /// Load a collection of T into the worksheet starting from the top left row of the range.
    /// Default option will load all public instance properties of T
    /// </summary>
    /// <typeparam name="T">The datatype in the collection</typeparam>
    /// <param name="Collection">The collection to load</param>
        /// <param name="PrintHeaders">Print the property names on the first row. If the property is decorated with a <see cref="DisplayNameAttribute"/> or a <see cref="DescriptionAttribute"/> that attribute will be used instead of the reflected member name.</param>
    /// <returns>The filled range</returns>
    public ExcelRangeBase LoadFromCollection<T>(IEnumerable<T> Collection, bool PrintHeaders)
    {
      return LoadFromCollection<T>(Collection, PrintHeaders, TableStyles.None, BindingFlags.Public | BindingFlags.Instance, null);
    }
    /// <summary>
    /// Load a collection of T into the worksheet starting from the top left row of the range.
    /// Default option will load all public instance properties of T
    /// </summary>
    /// <typeparam name="T">The datatype in the collection</typeparam>
    /// <param name="Collection">The collection to load</param>
        /// <param name="PrintHeaders">Print the property names on the first row. If the property is decorated with a <see cref="DisplayNameAttribute"/> or a <see cref="DescriptionAttribute"/> that attribute will be used instead of the reflected member name.</param>
    /// <param name="TableStyle">Will create a table with this style. If set to TableStyles.None no table will be created</param>
    /// <returns>The filled range</returns>
    public ExcelRangeBase LoadFromCollection<T>(IEnumerable<T> Collection, bool PrintHeaders, TableStyles TableStyle)
    {
      return LoadFromCollection<T>(Collection, PrintHeaders, TableStyle, BindingFlags.Public | BindingFlags.Instance, null);
    }
    /// <summary>
    /// Load a collection into the worksheet starting from the top left row of the range.
    /// </summary>
    /// <typeparam name="T">The datatype in the collection</typeparam>
    /// <param name="Collection">The collection to load</param>
    /// <param name="PrintHeaders">Print the property names on the first row. Any underscore in the property name will be converted to a space. If the property is decorated with a <see cref="DisplayNameAttribute"/> or a <see cref="DescriptionAttribute"/> that attribute will be used instead of the reflected member name.</param>
    /// <param name="TableStyle">Will create a table with this style. If set to TableStyles.None no table will be created</param>
    /// <param name="memberFlags">Property flags to use</param>
    /// <param name="Members">The properties to output. Must be of type T</param>
    /// <returns>The filled range</returns>
    public ExcelRangeBase LoadFromCollection<T>(IEnumerable<T> Collection, bool PrintHeaders, TableStyles TableStyle, BindingFlags memberFlags, MemberInfo[] Members)
    {
      var type = typeof(T);
      if (Members == null)
      {
        Members = type.GetProperties(memberFlags);
      }
      else
      {
        foreach (var t in Members)
        {
                    if (t.DeclaringType!=null && t.DeclaringType != type && !t.DeclaringType.IsSubclassOf(type))
          {
            throw new InvalidCastException("Supplied properties in parameter Properties must be of the same type as T (or an assignable type from T");
          }
        }
      }

      int col = _fromCol, row = _fromRow;
      if (Members.Length > 0 && PrintHeaders)
      {
        foreach (var t in Members)
        {
                    var descriptionAttribute = t.GetCustomAttributes(typeof(DescriptionAttribute), false).FirstOrDefault() as DescriptionAttribute;
            var header = string.Empty;
                    if (descriptionAttribute != null)
                    {
                        header = descriptionAttribute.Description;
                    }
                    else
                    {
                        var displayNameAttribute =
                            t.GetCustomAttributes(typeof (DisplayNameAttribute), false).FirstOrDefault() as
                            DisplayNameAttribute;
                        if (displayNameAttribute != null)
                        {
                            header = displayNameAttribute.DisplayName;
                        }
                        else
                        {
                            header = t.Name.Replace('_', ' ');
                        }
                    }
                    _worksheet._values.SetValue(row, col++, header);
        }
        row++;
      }

      if (Members.Length == 0)
      {
        foreach (var item in Collection)
        {
          _worksheet.Cells[row++, col].Value = item;
        }
      }
      else
      {
        foreach (var item in Collection)
        {
          col = _fromCol;
                    if (item is string || item is decimal || item is DateTime || item.GetType().IsPrimitive)
                    {
                        _worksheet.Cells[row, col++].Value = item;
                    }
                    else
                    {
                        foreach (var t in Members)
                        {
                            if (t is PropertyInfo)
                            {
                                _worksheet.Cells[row, col++].Value = ((PropertyInfo)t).GetValue(item, null);
                            }
                            else if (t is FieldInfo)
                            {
                                _worksheet.Cells[row, col++].Value = ((FieldInfo)t).GetValue(item);
                            }
                            else if (t is MethodInfo)
                            {
                                _worksheet.Cells[row, col++].Value = ((MethodInfo)t).Invoke(item, null);
                            }
                        }
                    }
          row++;
        }
      }

            if (_fromRow == row-1 && PrintHeaders)
            {
                row++;
            }

            var r = _worksheet.Cells[_fromRow, _fromCol, row - 1, Members.Length==0 ? col : col - 1];

      if (TableStyle != TableStyles.None)
      {
        var tbl = _worksheet.Tables.Add(r, "");
        tbl.ShowHeader = PrintHeaders;
        tbl.TableStyle = TableStyle;
      }
      return r;
    }
    #endregion
    #region LoadFromText
    /// <summary>
    /// Loads a CSV text into a range starting from the top left cell.
    /// Default settings is Comma separation
    /// </summary>
    /// <param name="Text">The Text</param>
    /// <returns>The range containing the data</returns>
    public ExcelRangeBase LoadFromText(string Text)
    {
      return LoadFromText(Text, new ExcelTextFormat());
    }
    /// <summary>
    /// Loads a CSV text into a range starting from the top left cell.
    /// </summary>
    /// <param name="Text">The Text</param>
    /// <param name="Format">Information how to load the text</param>
    /// <returns>The range containing the data</returns>
    public ExcelRangeBase LoadFromText(string Text, ExcelTextFormat Format)
    {
            if (string.IsNullOrEmpty(Text))
            {
                var r = _worksheet.Cells[_fromRow, _fromCol];
                r.Value = "";
                return r;
            }
            
            if (Format == null) Format = new ExcelTextFormat();

            string[] lines = Regex.Split(Text, Format.EOL);
      int row = _fromRow;
      int col = _fromCol;
      int maxCol = col;
      int lineNo = 1;
      foreach (string line in lines)
      {
        if (lineNo > Format.SkipLinesBeginning && lineNo <= lines.Length - Format.SkipLinesEnd)
        {
          col = _fromCol;
          string v = "";
          bool isText = false, isQualifier = false;
          int QCount = 0;
          foreach (char c in line)
          {
            if (Format.TextQualifier != 0 && c == Format.TextQualifier)
            {
              if (!isText && v != "")
              {
                throw (new Exception(string.Format("Invalid Text Qualifier in line : {0}", line)));
              }
              isQualifier = !isQualifier;
              QCount += 1;
              isText = true;
            }
            else
            {
                            if (QCount > 1 && !string.IsNullOrEmpty(v))
              {
                v += new string(Format.TextQualifier, QCount / 2);
              }
                            else if(QCount>2 && string.IsNullOrEmpty(v))
                            {
                                v += new string(Format.TextQualifier, (QCount-1) / 2);
                            }

              if (isQualifier)
              {
                v += c;
              }
              else
              {
                if (c == Format.Delimiter)
                {
                    _worksheet.SetValue(row, col, ConvertData(Format, v, col - _fromCol, isText));
                  v = "";
                  isText = false;
                  col++;
                }
                else
                {
                  if (QCount % 2 == 1)
                  {
                    throw (new Exception(string.Format("Text delimiter is not closed in line : {0}", line)));
                  }
                  v += c;
                }
              }
              QCount = 0;
            }
          }
          if (QCount > 1)
          {
            v += new string(Format.TextQualifier, QCount / 2);
          }

            _worksheet._values.SetValue(row, col, ConvertData(Format, v, col - _fromCol, isText));
          if (col > maxCol) maxCol = col;
          row++;
        }
        lineNo++;
      }
      return _worksheet.Cells[_fromRow, _fromCol, row - 1, maxCol];
    }
    /// <summary>
    /// Loads a CSV text into a range starting from the top left cell.
    /// </summary>
    /// <param name="Text">The Text</param>
    /// <param name="Format">Information how to load the text</param>
    /// <param name="TableStyle">Create a table with this style</param>
    /// <param name="FirstRowIsHeader">Use the first row as header</param>
    /// <returns></returns>
    public ExcelRangeBase LoadFromText(string Text, ExcelTextFormat Format, TableStyles TableStyle, bool FirstRowIsHeader)
    {
      var r = LoadFromText(Text, Format);

      var tbl = _worksheet.Tables.Add(r, "");
      tbl.ShowHeader = FirstRowIsHeader;
      tbl.TableStyle = TableStyle;

      return r;
    }
    /// <summary>
    /// Loads a CSV file into a range starting from the top left cell.
    /// </summary>
    /// <param name="TextFile">The Textfile</param>
    /// <returns></returns>
    public ExcelRangeBase LoadFromText(FileInfo TextFile)
    {
      return LoadFromText(File.ReadAllText(TextFile.FullName, Encoding.ASCII));
    }
    /// <summary>
    /// Loads a CSV file into a range starting from the top left cell.
    /// </summary>
    /// <param name="TextFile">The Textfile</param>
    /// <param name="Format">Information how to load the text</param>
    /// <returns></returns>
    public ExcelRangeBase LoadFromText(FileInfo TextFile, ExcelTextFormat Format)
    {
      return LoadFromText(File.ReadAllText(TextFile.FullName, Format.Encoding), Format);
    }
    /// <summary>
    /// Loads a CSV file into a range starting from the top left cell.
    /// </summary>
    /// <param name="TextFile">The Textfile</param>
    /// <param name="Format">Information how to load the text</param>
    /// <param name="TableStyle">Create a table with this style</param>
    /// <param name="FirstRowIsHeader">Use the first row as header</param>
    /// <returns></returns>
    public ExcelRangeBase LoadFromText(FileInfo TextFile, ExcelTextFormat Format, TableStyles TableStyle, bool FirstRowIsHeader)
    {
      return LoadFromText(File.ReadAllText(TextFile.FullName, Format.Encoding), Format, TableStyle, FirstRowIsHeader);
    }
    #endregion
    #region GetValue
    /// <summary>
    /// Get the strongly typed value of the cell.
    /// </summary>
    /// <typeparam name="T">The type</typeparam>
    /// <returns>The value. If the value can't be converted to the specified type, the default value will be returned</returns>
    public T GetValue<T>()
    {
      return _worksheet.GetTypedValue<T>(Value);
    }
    #endregion
    /// <summary>
    /// Get a range with an offset from the top left cell.
    /// The new range has the same dimensions as the current range
    /// </summary>
    /// <param name="RowOffset">Row Offset</param>
    /// <param name="ColumnOffset">Column Offset</param>
    /// <returns></returns>
    public ExcelRangeBase Offset(int RowOffset, int ColumnOffset)
    {
      if (_fromRow + RowOffset < 1 || _fromCol + ColumnOffset < 1 || _fromRow + RowOffset > ExcelPackage.MaxRows || _fromCol + ColumnOffset > ExcelPackage.MaxColumns)
      {
        throw (new ArgumentOutOfRangeException("Offset value out of range"));
      }
      string address = GetAddress(_fromRow + RowOffset, _fromCol + ColumnOffset, _toRow + RowOffset, _toCol + ColumnOffset);
      return new ExcelRangeBase(_worksheet, address);
    }
    /// <summary>
    /// Get a range with an offset from the top left cell.
    /// </summary>
    /// <param name="RowOffset">Row Offset</param>
    /// <param name="ColumnOffset">Column Offset</param>
    /// <param name="NumberOfRows">Number of rows. Minimum 1</param>
    /// <param name="NumberOfColumns">Number of colums. Minimum 1</param>
    /// <returns></returns>
    public ExcelRangeBase Offset(int RowOffset, int ColumnOffset, int NumberOfRows, int NumberOfColumns)
    {
      if (NumberOfRows < 1 || NumberOfColumns < 1)
      {
        throw (new Exception("Number of rows/columns must be greater than 0"));
      }
      NumberOfRows--;
      NumberOfColumns--;
      if (_fromRow + RowOffset < 1 || _fromCol + ColumnOffset < 1 || _fromRow + RowOffset > ExcelPackage.MaxRows || _fromCol + ColumnOffset > ExcelPackage.MaxColumns ||
         _fromRow + RowOffset + NumberOfRows < 1 || _fromCol + ColumnOffset + NumberOfColumns < 1 || _fromRow + RowOffset + NumberOfRows > ExcelPackage.MaxRows || _fromCol + ColumnOffset + NumberOfColumns > ExcelPackage.MaxColumns)
      {
        throw (new ArgumentOutOfRangeException("Offset value out of range"));
      }
      string address = GetAddress(_fromRow + RowOffset, _fromCol + ColumnOffset, _fromRow + RowOffset + NumberOfRows, _fromCol + ColumnOffset + NumberOfColumns);
      return new ExcelRangeBase(_worksheet, address);
    }
    /// <summary>
    /// Adds a new comment for the range.
    /// If this range contains more than one cell, the top left comment is returned by the method.
    /// </summary>
    /// <param name="Text"></param>
    /// <param name="Author"></param>
    /// <returns>A reference comment of the top left cell</returns>
    public ExcelComment AddComment(string Text, string Author)
    {
      //Check if any comments exists in the range and throw an exception
      _changePropMethod(Exists_Comment, null);
      //Create the comments
      _changePropMethod(Set_Comment, new string[] { Text, Author });

      return _worksheet.Comments[new ExcelCellAddress(_fromRow, _fromCol)];
    }

        ///// <summary>
        ///// Copies the range of cells to an other range
        ///// </summary>
        ///// <param name="Destination">The start cell where the range will be copied.</param>
        public void Copy(ExcelRangeBase Destination)
        {
            bool sameWorkbook = Destination._worksheet.Workbook == _worksheet.Workbook;
            ExcelStyles sourceStyles = _worksheet.Workbook.Styles,
                        styles = Destination._worksheet.Workbook.Styles;
            Dictionary<int, int> styleCashe = new Dictionary<int, int>();

            //Delete all existing cells; 
            int toRow = _toRow - _fromRow + 1,
                toCol = _toCol - _fromCol + 1;

            string s = "";
            int i=0;
            object o = null;
            byte flag=0;
            Uri hl = null;
            ExcelComment comment=null;

            var cse = new CellsStoreEnumerator<object>(_worksheet._values, _fromRow, _fromCol, _toRow, _toCol);
            var copiedValue = new List<CopiedCell>();
            while (cse.Next())
            {
                var row=cse.Row;
                var col = cse.Column;       //Issue 15070
                var cell = new CopiedCell
                {
                    Row = Destination._fromRow + (row - _fromRow),
                    Column = Destination._fromCol + (col - _fromCol),
                    Value=cse.Value
                };

                //Destination._worksheet._values.SetValue(row, col, cse.Value);

                if (_worksheet._types.Exists(row, col, ref s))
                {
                    //Destination._worksheet._types.SetValue(row, col,s);
                    cell.Type=s;
                }

                if (_worksheet._formulas.Exists(row, col, ref o))
                {
                    if (o is int)
                    {
                       // Destination._worksheet._formulas.SetValue(row, col, _worksheet.GetFormula(cse.Row, cse.Column));    //Shared formulas, set the formula per cell to simplify
                        cell.Formula=_worksheet.GetFormula(cse.Row, cse.Column);
                    }
                    else
                    {
                        //Destination._worksheet._formulas.SetValue(row, col, o);
                        cell.Formula=o;
                    }
                }
                if(_worksheet._styles.Exists(row, col, ref i))
                {
                    if (sameWorkbook)
                    {
                        //Destination._worksheet._styles.SetValue(row, col, i);
                        cell.StyleID=i;
                    }
                    else
                    {
                        if (styleCashe.ContainsKey(i))
                        {
                            i = styleCashe[i];
                        }
                        else
                        {
                            var oldStyleID = i;
                            i = styles.CloneStyle(sourceStyles, i);
                            styleCashe.Add(oldStyleID, i);
                        }
                        //Destination._worksheet._styles.SetValue(row, col, i);
                        cell.StyleID=i;
                    }
                }
                
                if (_worksheet._hyperLinks.Exists(row, col, ref hl))
                {
                    //Destination._worksheet._hyperLinks.SetValue(row, col, hl);
                    cell.HyperLink=hl;
                }

                if(_worksheet._commentsStore.Exists(row, col, ref comment))
                {
                    cell.Comment=comment;
                }

                if (_worksheet._flags.Exists(row, col, ref flag))
                {
                    cell.Flag = flag;
                }
                copiedValue.Add(cell);
            }

            //Copy styles with no cell value
            var cses = new CellsStoreEnumerator<int>(_worksheet._styles, _fromRow, _fromCol, _toRow, _toCol);
            while (cses.Next())
            {
                if (!_worksheet._values.Exists(cses.Row, cses.Column))
                {
                    var row = Destination._fromRow + (cses.Row - _fromRow);
                    var col = Destination._fromCol + (cses.Column - _fromCol);
                    var cell = new CopiedCell
                    {
                        Row = row,
                        Column = col,
                        Value = null
                    };

                    i = cses.Value;
                    if (sameWorkbook)
                    {
                        cell.StyleID = i;
                    }
                    else
                    {
                        if (styleCashe.ContainsKey(i))
                        {
                            i = styleCashe[i];
                        }
                        else
                        {
                            var oldStyleID = i;
                            i = styles.CloneStyle(sourceStyles, i);
                            styleCashe.Add(oldStyleID, i);
                        }
                        //Destination._worksheet._styles.SetValue(row, col, i);
                        cell.StyleID = i;
                    }
                    copiedValue.Add(cell);
                }
            }
            var copiedMergedCells = new Dictionary<int, ExcelAddress>();
            //Merged cells
            var csem = new CellsStoreEnumerator<int>(_worksheet.MergedCells._cells, _fromRow, _fromCol, _toRow, _toCol);
            while (csem.Next())
            {
                if(!copiedMergedCells.ContainsKey(csem.Value))
                {
                    var adr = new ExcelAddress(_worksheet.Name, _worksheet.MergedCells.List[csem.Value]);
                    if(this.Collide(adr)==eAddressCollition.Inside)
                    {                        
                        copiedMergedCells.Add(csem.Value, new ExcelAddress(
                            Destination._fromRow + (adr.Start.Row - _fromRow),
                            Destination._fromCol + (adr.Start.Column - _fromCol),
                            Destination._toRow + (adr.End.Row - _fromRow),
                            Destination._toCol + (adr.End.Column - _fromCol)));
                    }
                    else
                    {
                        //Partial merge of the address ignore.
                        copiedMergedCells.Add(csem.Value, null);
                    }
                }
            }

            Destination._worksheet.MergedCells.Delete(new ExcelAddressBase(Destination._fromRow, Destination._fromCol, Destination._fromRow+toRow, Destination._fromCol+toCol));

            Destination._worksheet._values.Clear(Destination._fromRow, Destination._fromCol, toRow, toCol);
            Destination._worksheet._formulas.Clear(Destination._fromRow, Destination._fromCol, toRow, toCol);
            Destination._worksheet._styles.Clear(Destination._fromRow, Destination._fromCol, toRow, toCol);
            Destination._worksheet._types.Clear(Destination._fromRow, Destination._fromCol, toRow, toCol);
            Destination._worksheet._hyperLinks.Clear(Destination._fromRow, Destination._fromCol, toRow, toCol);
            Destination._worksheet._flags.Clear(Destination._fromRow, Destination._fromCol, toRow, toCol);
            Destination._worksheet._commentsStore.Clear(Destination._fromRow, Destination._fromCol, toRow, toCol);
           
            foreach(var cell in copiedValue)
            {
                Destination._worksheet._values.SetValue(cell.Row, cell.Column, cell.Value);

                if(cell.Type!=null)
                {
                    Destination._worksheet._types.SetValue(cell.Row, cell.Column, cell.Type);
                }

                if(cell.StyleID!=null)
                {
                    Destination._worksheet._styles.SetValue(cell.Row, cell.Column, cell.StyleID.Value);
                }

                if(cell.Formula!=null)
                {
                    cell.Formula = UpdateFormulaReferences(cell.Formula.ToString(), Destination._fromRow - _fromRow, Destination._fromCol - _fromCol, 0, 0, true);
                    Destination._worksheet._formulas.SetValue(cell.Row, cell.Column, cell.Formula);
                }
                if(cell.HyperLink!=null)
                {
                    Destination._worksheet._hyperLinks.SetValue(cell.Row, cell.Column, cell.HyperLink);
                }

                if (cell.Comment != null)
                {
                    //Destination._worksheet._commentsStore.SetValue(cell.Row, cell.Column, cell.Comment);
                }
            }

            //Add merged cells
            foreach(var m in copiedMergedCells.Values)
            {
                if(m!=null)
                {
                    Destination._worksheet.MergedCells.Add(m, true);
                }
            }


            //Clone the cell
                //var copiedCell = (_worksheet._cells[GetCellID(_worksheet.SheetID, cell._fromRow, cell.column)] as ExcelCell);

                //var newCell = copiedCell.Clone(Destination._worksheet,
                //        Destination._fromRow + (copiedCell.Row - _fromRow),
                //        Destination.column + (copiedCell.Column - column));

        //        newCell.MergeId = _worksheet.GetMergeCellId(copiedCell.Row, copiedCell.Column);


        //        if (!string.IsNullOrEmpty(newCell.Formula))
        //        {
        //            newCell.Formula = ExcelCell.UpdateFormulaReferences(newCell.Formula, newCell.Row - copiedCell.Row, (newCell.Column - copiedCell.Column), 1, 1);
        //        }

        //        //If its not the same workbook we must copy the styles to the new workbook.
        //        if (!sameWorkbook)
        //        {
        //            if (styleCashe.ContainsKey(cell.StyleID))
        //            {
        //                newCell.StyleID = styleCashe[cell.StyleID];
        //            }
        //            else
        //            {
        //                newCell.StyleID = styles.CloneStyle(sourceStyles, cell.StyleID);
        //                styleCashe.Add(cell.StyleID, newCell.StyleID);
        //            }
        //        }
        //        newCells.Add(newCell);
        //        if (newCell.Merge) mergedCells.Add(newCell.CellID, newCell);
        //    }

        //    //Now clear the destination.
        //    Destination.Offset(0, 0, (_toRow - _fromRow) + 1, (_toCol - column) + 1).Clear();

        //    //And last add the new cells to the worksheet
        //    foreach (var cell in newCells)
        //    {
        //        Destination.Worksheet._cells.Add(cell);
        //    }
        //    //Add merged cells
        //    if (mergedCells.Count > 0)
        //    {
        //        List<ExcelAddressBase> mergedAddresses = new List<ExcelAddressBase>();
        //        foreach (var cell in mergedCells.Values)
        //        {
        //            if (!IsAdded(cell, mergedAddresses))
        //            {
        //                int startRow = cell.Row, startCol = cell.Column, endRow = cell.Row, endCol = cell.Column + 1;
        //                while (mergedCells.ContainsKey(ExcelCell.GetCellID(Destination.Worksheet.SheetID, endRow, endCol)))
        //                {
        //                    ExcelCell next = mergedCells[ExcelCell.GetCellID(Destination.Worksheet.SheetID, endRow, endCol)];
        //                    if (cell.MergeId != next.MergeId)
        //                    {
        //                        break;
        //                    }
        //                    endCol++;
        //                }

        //                while (IsMerged(mergedCells, Destination.Worksheet, endRow, startCol, endCol - 1, cell))
        //                {
        //                    endRow++;
        //                }

        //                mergedAddresses.Add(new ExcelAddressBase(startRow, startCol, endRow - 1, endCol - 1));
        //            }
        //        }
        //        Destination.Worksheet.MergedCells.List.AddRange((from r in mergedAddresses select r.Address));
        //    }
        //}

        //private bool IsAdded(ExcelCell cell, List<ExcelAddressBase> mergedAddresses)
        //{
        //    foreach (var address in mergedAddresses)
        //    {
        //        if (address.Collide(new ExcelAddressBase(cell.CellAddress)) == eAddressCollition.Inside)
        //        {
        //            return true;
        //        }
        //    }
        //    return false;
        //}

        //private bool IsMerged(Dictionary<ulong, ExcelCell> mergedCells, ExcelWorksheet worksheet, int row, int startCol, int endCol, ExcelCell cell)
        //{
        //    for (int col = startCol; col <= endCol; col++)
        //    {
        //        if (!mergedCells.ContainsKey(ExcelCell.GetCellID(worksheet.SheetID, row, col)))
        //        {
        //            return false;
        //        }
        //        else
        //        {
        //            ExcelCell next = mergedCells[ExcelCell.GetCellID(worksheet.SheetID, row, col)];
        //            if (cell.MergeId != next.MergeId)
        //            {
        //                return false;
        //            }
        //        }
        //    }
        //    return true;
        }

    /// <summary>
    /// Clear all cells
    /// </summary>
    public void Clear()
    {
      Delete(this, false);
    }
    /// <summary>
    /// Creates an array-formula.
    /// </summary>
    /// <param name="ArrayFormula">The formula</param>
    public void CreateArrayFormula(string ArrayFormula)
    {
      if (Addresses != null)
      {
        throw (new Exception("An Arrayformula can not have more than one address"));
      }
      Set_SharedFormula(ArrayFormula, this, true);
    }
        //private void Delete(ExcelAddressBase Range)
        //{
        //    Delete(Range, true);
        //}
        internal void Delete(ExcelAddressBase Range, bool shift)
    {
            //DeleteCheckMergedCells(Range);
            _worksheet.MergedCells.Delete(Range);
      //First find the start cell
            var rows=Range._toRow-Range._fromRow+1;
            var cols=Range._toCol - Range._fromCol+1;
            
            _worksheet._values.Delete(Range._fromRow, Range._fromCol, rows, cols, shift);
            _worksheet._types.Delete(Range._fromRow, Range._fromCol, rows, cols, shift);
            _worksheet._styles.Delete(Range._fromRow, Range._fromCol, rows, cols, shift);
            _worksheet._formulas.Delete(Range._fromRow, Range._fromCol, rows, cols, shift);
            _worksheet._hyperLinks.Delete(Range._fromRow, Range._fromCol, rows, cols, shift);
            _worksheet._flags.Delete(Range._fromRow, Range._fromCol, rows, cols, shift);
            _worksheet._commentsStore.Delete(Range._fromRow, Range._fromCol, rows, cols, shift);

            //if(shift)
            //{
            //    _worksheet.AdjustFormulasRow(Range._fromRow, rows);
            //}

      //Delete multi addresses as well
      if (Addresses != null)
      {
        foreach (var sub in Addresses)
        {
          Delete(sub, shift);
        }
            }
        }

        private void DeleteCheckMergedCells(ExcelAddressBase Range)
        {
            var removeItems = new List<string>();
            foreach (var addr in Worksheet.MergedCells)
            {
                var addrCol = Range.Collide(new ExcelAddress(Range.WorkSheet, addr));
                if (addrCol != eAddressCollition.No)
                {
                    if (addrCol == eAddressCollition.Inside)
                    {
                        removeItems.Add(addr);
                    }
                    else
                    {
                        throw (new InvalidOperationException("Can't remove/overwrite a part of cells that are merged"));
                    }
                }
            }
            foreach (var item in removeItems)
            {
                Worksheet.MergedCells.Remove(item);
      }
    }
    #endregion
    #region IDisposable Members

    public void Dispose()
    {
      //_worksheet = null;            
    }

    #endregion
    #region "Enumerator"
        //int _index;
        //ulong _toCellId;
        //int _enumAddressIx;
        CellsStoreEnumerator<object> cellEnum;
    public IEnumerator<ExcelRangeBase> GetEnumerator()
    {
            return new ExcelRangeBaseEnumerator(this);
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
            return new ExcelRangeBaseEnumerator(this);
    }

    /// <summary>
    /// The current range when enumerating
    /// </summary>
        public class ExcelRangeBaseEnumerator : IEnumerator<ExcelRangeBase> {
            private CellsStoreEnumerator<object> _cellEnum;
            private int _enumAddressIx = -1;
            private ExcelRangeBase _range;
            private ExcelRangeBase _current;

            /// <summary>
            /// The current range when enumerating
            /// </summary>
            public ExcelRangeBase Current {
                get {
                    return _current;
                }
            }

            /// <summary>
            /// The current range when enumerating
            /// </summary>
            object IEnumerator.Current {
                get {
                    return _current;
                }
            }

            public ExcelRangeBaseEnumerator(ExcelRangeBase range) {
                this._range = range;
                Reset();
            }
            public bool MoveNext() {
                if (_cellEnum.Next()) {
                    _current._fromCol = _cellEnum.Column;
                    _current._fromRow = _cellEnum.Row;
                    _current._toCol = _cellEnum.Column;
                    _current._toRow = _cellEnum.Row;
                    _current.Address = GetAddress(_current._fromRow, _current._fromCol);
                    return true;
                }
                else if (_range._addresses != null) {
                    _enumAddressIx++;
                    if (_enumAddressIx < _range._addresses.Count) {
                        _cellEnum = new CellsStoreEnumerator<object>(_range._worksheet._values,
                            _range._addresses[_enumAddressIx]._fromRow,
                            _range._addresses[_enumAddressIx]._fromCol,
                            _range._addresses[_enumAddressIx]._toRow,
                            _range._addresses[_enumAddressIx]._toCol);
                        return MoveNext();
                    }
                    else {
                        return false;
                    }
                }
                return false;
            }

            public void Reset() {
                _enumAddressIx = -1;
                _cellEnum = new CellsStoreEnumerator<object>(_range._worksheet._values, _range._fromRow, _range._fromCol, _range._toRow, _range._toCol);
                _current = new ExcelRangeBase(_range._worksheet, ExcelAddressBase.GetAddress(_cellEnum.Row, _cellEnum.Column));
            }

            public void Dispose() {
                if (_cellEnum != null) {
                    _cellEnum.Dispose();
                    _cellEnum = null;
                }
            }

        }

        //private void GetNextIndexEnum(int fromRow, int fromCol, int toRow, int toCol)
        //{
        //    if (_index >= _worksheet._cells.Count) return;
        //    ExcelCell cell = _worksheet._cells[_index] as ExcelCell;
        //    while (cell.Column > toCol || cell.Column < fromCol)
        //    {
        //        if (cell.Column < fromCol)
        //        {
        //            _index = _worksheet._cells.IndexOf(ExcelAddress.GetCellID(_worksheet.SheetID, cell.Row, fromCol));
        //        }
        //        else
        //        {
        //            _index = _worksheet._cells.IndexOf(ExcelAddress.GetCellID(_worksheet.SheetID, cell.Row + 1, fromCol));
        //        }

        //        if (_index < 0)
        //        {
        //            _index = ~_index;
        //        }
        //        if (_index >= _worksheet._cells.Count || _worksheet._cells[_index].RangeID > _toCellId)
        //        {
        //            break;
        //        }
        //        cell = _worksheet._cells[_index] as ExcelCell;
        //    }
        //}

        //private void GetStartIndexEnum(int fromRow, int fromCol, int toRow, int toCol)
        //{
        //    _index = _worksheet._cells.IndexOf(ExcelCellBase.GetCellID(_worksheet.SheetID, fromRow, fromCol));
        //    _toCellId = ExcelCellBase.GetCellID(_worksheet.SheetID, toRow, toCol);
        //    if (_index < 0)
        //    {
        //        _index = ~_index;
        //    }
        //    _index--;
        //}
    #endregion
    }
}