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annotate MetroWpf/MetroWpf.Framework/Extensions/ObjectExtensions.cs @ 15:060f02cd4591

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author stevenh7776 stevenhollidge@hotmail.com
date Mon, 12 Mar 2012 23:05:21 +0800
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15
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1 using System;
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2 using System.Collections.Generic;
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3 using System.ComponentModel;
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4
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5 namespace MetroWpf
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6 {
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7 /// <summary>
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8 /// Extension methods for the root data type object
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9 /// </summary>
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10 public static class ObjectExtensions
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11 {
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12 #region · Extensions ·
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13
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14 /// <summary>
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15 /// Determines whether the object is equal to any of the provided values.
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16 /// </summary>
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17 /// <typeparam name="T"></typeparam>
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18 /// <param name="obj">The object to be compared.</param>
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19 /// <param name="values">The values to compare with the object.</param>
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20 /// <returns></returns>
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21 public static bool EqualsAny<T>(this T obj, params T[] values)
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22 {
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23 return (Array.IndexOf(values, obj) != -1);
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24 }
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25
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26 /// <summary>
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27 /// Determines whether the object is equal to none of the provided values.
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28 /// </summary>
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29 /// <typeparam name="T"></typeparam>
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30 /// <param name="obj">The object to be compared.</param>
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31 /// <param name="values">The values to compare with the object.</param>
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32 /// <returns></returns>
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33 public static bool EqualsNone<T>(this T obj, params T[] values)
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34 {
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35 return (obj.EqualsAny(values) == false);
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36 }
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37
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38 /// <summary>
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39 /// Converts an object to the specified target type or returns the default value.
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40 /// </summary>
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41 /// <typeparam name="T"></typeparam>
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42 /// <param name="value">The value.</param>
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43 /// <returns>The target type</returns>
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44 public static T ConvertTo<T>(this object value)
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45 {
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46 return value.ConvertTo(default(T));
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47 }
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48
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49 /// <summary>
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50 /// Converts an object to the specified target type or returns the default value.
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51 /// </summary>
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52 /// <typeparam name="T"></typeparam>
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53 /// <param name="value">The value.</param>
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54 /// <param name="defaultValue">The default value.</param>
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55 /// <returns>The target type</returns>
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56 public static T ConvertTo<T>(this object value, T defaultValue)
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57 {
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58 if (value != null)
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59 {
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60 var targetType = typeof(T);
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61
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62 var converter = TypeDescriptor.GetConverter(value);
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63
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64 if (converter != null)
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65 {
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66 if (converter.CanConvertTo(targetType))
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67 {
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68 return (T)converter.ConvertTo(value, targetType);
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69 }
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70 }
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71
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72 converter = TypeDescriptor.GetConverter(targetType);
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73
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74 if (converter != null)
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75 {
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76 if (converter.CanConvertFrom(value.GetType()))
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77 {
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78 return (T)converter.ConvertFrom(value);
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79 }
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80 }
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81 }
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82
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83 return defaultValue;
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84 }
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85
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86 /// <summary>
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87 /// Converts an object to the specified target type or returns the default value. Any exceptions are optionally ignored.
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88 /// </summary>
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89 /// <typeparam name="T"></typeparam>
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90 /// <param name="value">The value.</param>
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91 /// <param name="defaultValue">The default value.</param>
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92 /// <param name="ignoreException">if set to <c>true</c> ignore any exception.</param>
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93 /// <returns>The target type</returns>
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94 public static T ConvertTo<T>(this object value, T defaultValue, bool ignoreException)
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95 {
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96 if (ignoreException)
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97 {
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98 try
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99 {
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100 return value.ConvertTo<T>();
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101 }
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102 catch
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103 {
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104 return defaultValue;
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105 }
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106 }
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107
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108 return value.ConvertTo<T>();
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109 }
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110
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111 /// <summary>
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112 /// Determines whether the value can (in theory) be converted to the specified target type.
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113 /// </summary>
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114 /// <typeparam name="T"></typeparam>
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115 /// <param name="value">The value.</param>
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116 /// <returns>
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117 /// <c>true</c> if this instance can be convert to the specified target type; otherwise, <c>false</c>.
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118 /// </returns>
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119 public static bool CanConvertTo<T>(this object value)
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120 {
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121 if (value != null)
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122 {
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123 var targetType = typeof(T);
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124
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125 var converter = TypeDescriptor.GetConverter(value);
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126
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127 if (converter != null)
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128 {
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129 if (converter.CanConvertTo(targetType))
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130 {
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131 return true;
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132 }
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133 }
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134
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135 converter = TypeDescriptor.GetConverter(targetType);
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136
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137 if (converter != null)
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138 {
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139 if (converter.CanConvertFrom(value.GetType()))
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140 {
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141 return true;
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142 }
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143 }
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144 }
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145 return false;
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146 }
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147
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148 /// <summary>
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149 /// Converts the specified value to a different type.
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150 /// </summary>
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151 /// <typeparam name="T"></typeparam>
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152 /// <param name="value">The value.</param>
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153 /// <returns>An universal converter suppliying additional target conversion methods</returns>
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154 /// <example><code>
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155 /// var value = "123";
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156 /// var numeric = value.Convert().ToInt32();
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157 /// </code></example>
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158 public static IConverter<T> Convert<T>(this T value)
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159 {
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160 return new Converter<T>(value);
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161 }
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162
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163 /// <summary>
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164 /// Dynamically invokes a method using reflection
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165 /// </summary>
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166 /// <param name="obj">The object to perform on.</param>
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167 /// <param name="methodName">The name of the method.</param>
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168 /// <param name="parameters">The parameters passed to the method.</param>
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169 /// <returns>The return value</returns>
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170 /// <example>
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171 /// <code>
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172 /// var type = Type.GetType("System.IO.FileInfo, mscorlib");
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173 /// var file = type.CreateInstance(@"c:\autoexec.bat");
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174 /// if(file.GetPropertyValue&lt;bool&gt;("Exists")) {
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175 /// var reader = file.InvokeMethod&lt;StreamReader&gt;("OpenText");
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176 /// Console.WriteLine(reader.ReadToEnd());
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177 /// reader.Close();
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178 /// }
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179 /// </code>
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180 /// </example>
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181 public static object InvokeMethod(this object obj, string methodName, params object[] parameters)
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182 {
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183 return InvokeMethod<object>(obj, methodName, parameters);
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184 }
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185
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186 /// <summary>
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187 /// Dynamically invokes a method using reflection and returns its value in a typed manner
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188 /// </summary>
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189 /// <typeparam name="T">The expected return data types</typeparam>
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190 /// <param name="obj">The object to perform on.</param>
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191 /// <param name="methodName">The name of the method.</param>
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192 /// <param name="parameters">The parameters passed to the method.</param>
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193 /// <returns>The return value</returns>
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194 /// <example>
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195 /// <code>
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196 /// var type = Type.GetType("System.IO.FileInfo, mscorlib");
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197 /// var file = type.CreateInstance(@"c:\autoexec.bat");
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198 /// if(file.GetPropertyValue&lt;bool&gt;("Exists")) {
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199 /// var reader = file.InvokeMethod&lt;StreamReader&gt;("OpenText");
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200 /// Console.WriteLine(reader.ReadToEnd());
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201 /// reader.Close();
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202 /// }
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203 /// </code>
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204 /// </example>
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205 public static T InvokeMethod<T>(this object obj, string methodName, params object[] parameters)
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206 {
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207 var type = obj.GetType();
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208 var method = type.GetMethod(methodName);
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209
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210 if (method == null)
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211 {
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212 throw new ArgumentException(string.Format("Method '{0}' not found.", methodName), methodName);
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213 }
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214
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215 var value = method.Invoke(obj, parameters);
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216
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217 return (value is T ? (T)value : default(T));
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218 }
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219
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220 /// <summary>
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221 /// Dynamically retrieves a property value.
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222 /// </summary>
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223 /// <param name="obj">The object to perform on.</param>
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224 /// <param name="propertyName">The Name of the property.</param>
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225 /// <returns>The property value.</returns>
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226 /// <example>
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227 /// <code>
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228 /// var type = Type.GetType("System.IO.FileInfo, mscorlib");
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229 /// var file = type.CreateInstance(@"c:\autoexec.bat");
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230 /// if(file.GetPropertyValue&lt;bool&gt;("Exists")) {
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231 /// var reader = file.InvokeMethod&lt;StreamReader&gt;("OpenText");
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232 /// Console.WriteLine(reader.ReadToEnd());
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233 /// reader.Close();
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234 /// }
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235 /// </code>
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236 /// </example>
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237 public static object GetPropertyValue(this object obj, string propertyName)
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238 {
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239 return GetPropertyValue<object>(obj, propertyName, null);
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240 }
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241
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242 /// <summary>
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243 /// Dynamically retrieves a property value.
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244 /// </summary>
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245 /// <typeparam name="T">The expected return data type</typeparam>
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246 /// <param name="obj">The object to perform on.</param>
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247 /// <param name="propertyName">The Name of the property.</param>
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248 /// <returns>The property value.</returns>
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249 /// <example>
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250 /// <code>
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251 /// var type = Type.GetType("System.IO.FileInfo, mscorlib");
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252 /// var file = type.CreateInstance(@"c:\autoexec.bat");
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253 /// if(file.GetPropertyValue&lt;bool&gt;("Exists")) {
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254 /// var reader = file.InvokeMethod&lt;StreamReader&gt;("OpenText");
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255 /// Console.WriteLine(reader.ReadToEnd());
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256 /// reader.Close();
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257 /// }
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258 /// </code>
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259 /// </example>
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260 public static T GetPropertyValue<T>(this object obj, string propertyName)
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261 {
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262 return GetPropertyValue<T>(obj, propertyName, default(T));
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263 }
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264
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265 /// <summary>
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266 /// Dynamically retrieves a property value.
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267 /// </summary>
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268 /// <typeparam name="T">The expected return data type</typeparam>
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269 /// <param name="obj">The object to perform on.</param>
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270 /// <param name="propertyName">The Name of the property.</param>
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271 /// <param name="defaultValue">The default value to return.</param>
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272 /// <returns>The property value.</returns>
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273 /// <example>
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274 /// <code>
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275 /// var type = Type.GetType("System.IO.FileInfo, mscorlib");
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276 /// var file = type.CreateInstance(@"c:\autoexec.bat");
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277 /// if(file.GetPropertyValue&lt;bool&gt;("Exists")) {
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278 /// var reader = file.InvokeMethod&lt;StreamReader&gt;("OpenText");
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279 /// Console.WriteLine(reader.ReadToEnd());
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280 /// reader.Close();
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281 /// }
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282 /// </code>
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283 /// </example>
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284 public static T GetPropertyValue<T>(this object obj, string propertyName, T defaultValue)
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285 {
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286 var type = obj.GetType();
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287 var property = type.GetProperty(propertyName);
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288
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289 if (property == null)
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290 {
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291 throw new ArgumentException(string.Format("Property '{0}' not found.", propertyName), propertyName);
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292 }
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293
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294 var value = property.GetValue(obj, null);
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295
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296 return (value is T ? (T)value : defaultValue);
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297 }
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298
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299 /// <summary>
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300 /// Dynamically sets a property value.
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301 /// </summary>
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302 /// <param name="obj">The object to perform on.</param>
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303 /// <param name="propertyName">The Name of the property.</param>
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304 /// <param name="value">The value to be set.</param>
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305 public static void SetPropertyValue(this object obj, string propertyName, object value)
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306 {
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307 var type = obj.GetType();
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308 var property = type.GetProperty(propertyName);
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309
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310 if (property == null)
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311 {
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312 throw new ArgumentException(string.Format("Property '{0}' not found.", propertyName), propertyName);
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313 }
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314
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315 property.SetValue(obj, value, null);
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316 }
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317
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318 /// <summary>
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319 /// Gets the first matching attribute defined on the data type.
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320 /// </summary>
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321 /// <typeparam name="T">The attribute type tp look for.</typeparam>
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322 /// <param name="obj">The object to look on.</param>
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323 /// <returns>The found attribute</returns>
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324 public static T GetAttribute<T>(this object obj) where T : Attribute
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325 {
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326 return GetAttribute<T>(obj, true);
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327 }
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328
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329 /// <summary>
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330 /// Gets the first matching attribute defined on the data type.
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331 /// </summary>
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332 /// <typeparam name="T">The attribute type tp look for.</typeparam>
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333 /// <param name="obj">The object to look on.</param>
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334 /// <param name="includeInherited">if set to <c>true</c> includes inherited attributes.</param>
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335 /// <returns>The found attribute</returns>
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336 public static T GetAttribute<T>(this object obj, bool includeInherited) where T : Attribute
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337 {
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338 var type = (obj as Type ?? obj.GetType());
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339 var attributes = type.GetCustomAttributes(typeof(T), includeInherited);
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340
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341 if ((attributes != null) && (attributes.Length > 0))
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342 {
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343 return (attributes[0] as T);
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344 }
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345
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346 return null;
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347 }
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348
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349 /// <summary>
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350 /// Gets all matching attribute defined on the data type.
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351 /// </summary>
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352 /// <typeparam name="T">The attribute type tp look for.</typeparam>
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353 /// <param name="obj">The object to look on.</param>
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354 /// <returns>The found attributes</returns>
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355 public static IEnumerable<T> GetAttributes<T>(this object obj) where T : Attribute
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356 {
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357 return GetAttributes<T>(obj);
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358 }
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359
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360 /// <summary>
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361 /// Gets all matching attribute defined on the data type.
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362 /// </summary>
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363 /// <typeparam name="T">The attribute type tp look for.</typeparam>
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364 /// <param name="obj">The object to look on.</param>
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365 /// <param name="includeInherited">if set to <c>true</c> includes inherited attributes.</param>
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366 /// <returns>The found attributes</returns>
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367 public static IEnumerable<T> GetAttributes<T>(this object obj, bool includeInherited) where T : Attribute
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368 {
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369 var type = (obj as Type ?? obj.GetType());
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370
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371 foreach (var attribute in type.GetCustomAttributes(typeof(T), includeInherited))
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372 {
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373 if (attribute is T)
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374 {
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375 yield return (T)attribute;
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376 }
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377 }
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378 }
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379
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380 #endregion
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381 }
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382 }