1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using HeuristicLab.Persistence.Interfaces;
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5 | using HeuristicLab.Persistence.Core;
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6 | using System.Reflection;
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7 | using HeuristicLab.Persistence.Auxiliary;
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8 | using System.Text;
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9 | using System.Reflection.Emit;
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10 |
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11 | namespace HeuristicLab.Persistence.Default.CompositeSerializers.Storable {
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12 |
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13 | internal static class StorableReflection {
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14 |
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15 | private const BindingFlags DECLARED_INSTANCE_MEMBERS =
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16 | BindingFlags.Instance |
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17 | BindingFlags.Public |
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18 | BindingFlags.NonPublic |
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19 | BindingFlags.DeclaredOnly;
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20 |
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21 | private delegate void HookWrapper<T>(T o);
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22 | public delegate void Hook(object o);
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23 |
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24 | public static IEnumerable<StorableMemberInfo> GenerateStorableMembers(Type type) {
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25 | var storableMembers = new List<StorableMemberInfo>();
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26 | if (type.BaseType != null)
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27 | storableMembers.AddRange(GenerateStorableMembers(type.BaseType));
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28 |
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29 | var storableClassAttribute = GetStorableClassAttribute(type);
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30 | if (storableClassAttribute != null) {
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31 | switch (storableClassAttribute.Type) {
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32 | case StorableClassType.MarkedOnly:
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33 | AddMarkedMembers(type, storableMembers); break;
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34 | case StorableClassType.AllFields:
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35 | AddAll(type, MemberTypes.Field, storableMembers); break;
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36 | case StorableClassType.AllProperties:
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37 | AddAll(type, MemberTypes.Property, storableMembers); break;
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38 | case StorableClassType.AllFieldsAndAllProperties:
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39 | AddAll(type, MemberTypes.Field | MemberTypes.Property, storableMembers); break;
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40 | default:
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41 | throw new PersistenceException("unsupported [StorableClassType]: " + storableClassAttribute.Type);
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42 | }
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43 | }
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44 |
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45 | return DisentangleNameMapping(storableMembers);
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46 | }
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47 |
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48 | public static bool IsEmptyOrStorableType(Type type, bool recursive) {
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49 | if (!HasStorableClassAttribute(type) && !IsEmptyType(type, false)) return false;
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50 | return !recursive || type.BaseType == null || IsEmptyOrStorableType(type.BaseType, true);
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51 | }
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52 |
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53 | private static object[] emptyArgs = new object[0];
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54 |
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55 | public static IEnumerable<Hook> CollectHooks(HookType hookType, Type type) {
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56 | if (type.BaseType != null)
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57 | foreach (var mi in CollectHooks(hookType, type.BaseType))
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58 | yield return mi;
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59 | foreach (MemberInfo memberInfo in type.GetMembers(DECLARED_INSTANCE_MEMBERS)) {
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60 | foreach (StorableHookAttribute hook in memberInfo.GetCustomAttributes(typeof(StorableHookAttribute), false)) {
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61 | if (hook != null && hook.HookType == hookType) {
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62 | MethodInfo methodInfo = memberInfo as MethodInfo;
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63 | if (memberInfo.MemberType != MemberTypes.Method || memberInfo == null)
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64 | throw new ArgumentException("Storable hooks must be methods");
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65 | DynamicMethod dm = new DynamicMethod("", null, new[] { typeof(object) }, type);
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66 | ILGenerator ilgen = dm.GetILGenerator();
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67 | ilgen.Emit(OpCodes.Ldarg_0);
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68 | ilgen.Emit(OpCodes.Callvirt, methodInfo);
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69 | ilgen.Emit(OpCodes.Ret);
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70 | yield return (Hook)dm.CreateDelegate(typeof(Hook));
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71 | }
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72 | }
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73 | }
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74 | }
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75 |
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76 | #region [Storable] helpers
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77 |
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78 | private static void AddMarkedMembers(Type type, List<StorableMemberInfo> storableMembers) {
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79 | foreach (MemberInfo memberInfo in type.GetMembers(DECLARED_INSTANCE_MEMBERS)) {
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80 | foreach (StorableAttribute attribute in memberInfo.GetCustomAttributes(typeof(StorableAttribute), false)) {
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81 | storableMembers.Add(new StorableMemberInfo(attribute, memberInfo));
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82 | }
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83 | }
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84 | }
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85 |
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86 | private static void AddAll(Type type, MemberTypes memberTypes, List<StorableMemberInfo> storableMembers) {
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87 | foreach (MemberInfo memberInfo in type.GetMembers(DECLARED_INSTANCE_MEMBERS)) {
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88 | if ((memberInfo.MemberType & memberTypes) == memberInfo.MemberType &&
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89 | !memberInfo.Name.StartsWith("<") &&
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90 | !memberInfo.Name.EndsWith("k__BackingField"))
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91 | storableMembers.Add(new StorableMemberInfo(memberInfo));
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92 | }
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93 | }
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94 |
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95 |
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96 | private static IEnumerable<StorableMemberInfo> DisentangleNameMapping(
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97 | IEnumerable<StorableMemberInfo> storableMemberInfos) {
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98 | var nameGrouping = new Dictionary<string, List<StorableMemberInfo>>();
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99 | foreach (StorableMemberInfo storable in storableMemberInfos) {
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100 | if (!nameGrouping.ContainsKey(storable.MemberInfo.Name))
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101 | nameGrouping[storable.MemberInfo.Name] = new List<StorableMemberInfo>();
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102 | nameGrouping[storable.MemberInfo.Name].Add(storable);
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103 | }
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104 | var memberInfos = new List<StorableMemberInfo>();
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105 | foreach (var storableMemberInfoGroup in nameGrouping.Values) {
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106 | if (storableMemberInfoGroup.Count == 1) {
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107 | storableMemberInfoGroup[0].SetDisentangledName(storableMemberInfoGroup[0].MemberInfo.Name);
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108 | memberInfos.Add(storableMemberInfoGroup[0]);
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109 | } else if (storableMemberInfoGroup[0].MemberInfo.MemberType == MemberTypes.Field) {
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110 | foreach (var storableMemberInfo in storableMemberInfoGroup) {
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111 | storableMemberInfo.SetDisentangledName(storableMemberInfo.FullyQualifiedMemberName);
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112 | memberInfos.Add(storableMemberInfo);
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113 | }
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114 | } else {
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115 | memberInfos.AddRange(MergePropertyAccessors(storableMemberInfoGroup));
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116 | }
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117 | }
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118 | return memberInfos;
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119 | }
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120 |
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121 | private static IEnumerable<StorableMemberInfo> MergePropertyAccessors(List<StorableMemberInfo> members) {
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122 | var uniqueAccessors = new Dictionary<Type, StorableMemberInfo>();
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123 | foreach (var member in members)
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124 | uniqueAccessors[member.GetPropertyDeclaringBaseType()] = member;
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125 | if (uniqueAccessors.Count == 1) {
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126 | var storableMemberInfo = uniqueAccessors.Values.First();
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127 | storableMemberInfo.SetDisentangledName(storableMemberInfo.MemberInfo.Name);
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128 | yield return storableMemberInfo;
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129 | } else {
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130 | foreach (var attribute in uniqueAccessors.Values) {
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131 | attribute.SetDisentangledName(attribute.FullyQualifiedMemberName);
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132 | yield return attribute;
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133 | }
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134 | }
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135 | }
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136 |
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137 | #endregion
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138 |
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139 | #region [StorableClass] helpers
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140 |
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141 | private static StorableClassAttribute GetStorableClassAttribute(Type type) {
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142 | lock (storableClassCache) {
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143 | if (storableClassCache.ContainsKey(type))
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144 | return storableClassCache[type];
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145 | StorableClassAttribute attribute = type
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146 | .GetCustomAttributes(typeof(StorableClassAttribute), false)
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147 | .SingleOrDefault() as StorableClassAttribute;
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148 | storableClassCache.Add(type, attribute);
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149 | return attribute;
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150 | }
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151 | }
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152 |
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153 | public static bool HasStorableClassAttribute(Type type) {
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154 | return GetStorableClassAttribute(type) != null;
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155 | }
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156 |
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157 | private static Dictionary<Type, StorableClassAttribute> storableClassCache =
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158 | new Dictionary<Type, StorableClassAttribute>();
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159 |
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160 | #endregion
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161 |
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162 | #region other helpers
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163 |
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164 | private static bool IsEmptyType(Type type, bool recursive) {
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165 | foreach (MemberInfo memberInfo in type.GetMembers(DECLARED_INSTANCE_MEMBERS)) {
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166 | if (IsModifiableMember(memberInfo)) return false;
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167 | }
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168 | return !recursive || type.BaseType == null || IsEmptyType(type.BaseType, true);
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169 | }
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170 |
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171 | private static bool IsModifiableMember(MemberInfo memberInfo) {
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172 | return memberInfo.MemberType == MemberTypes.Field && IsModifiableField((FieldInfo)memberInfo) ||
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173 | memberInfo.MemberType == MemberTypes.Property && IsModifiableProperty((PropertyInfo)memberInfo);
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174 | }
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175 |
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176 | private static bool IsModifiableField(FieldInfo fi) {
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177 | return !fi.IsLiteral && !fi.IsInitOnly;
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178 | }
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179 |
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180 | private static bool IsModifiableProperty(PropertyInfo pi) {
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181 | return pi.CanWrite;
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182 | }
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183 |
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184 | #endregion
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185 |
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186 | }
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187 | } |
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