1 | /*--------------------------------------------------------------------------
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2 | * DynamicJson
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3 | * ver 1.2.0.0 (May. 21th, 2010)
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4 | *
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5 | * created and maintained by neuecc <ils@neue.cc>
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6 | * licensed under Microsoft Public License(Ms-PL)
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7 | * http://neue.cc/
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8 | * http://dynamicjson.codeplex.com/
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9 | *--------------------------------------------------------------------------*/
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10 | using System;
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11 | using System.Collections;
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12 | using System.Collections.Generic;
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13 | using System.Diagnostics;
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14 | using System.Dynamic;
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15 | using System.IO;
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16 | using System.Linq;
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17 | using System.Reflection;
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18 | using System.Runtime.Serialization.Json;
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19 | using System.Text;
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20 | using System.Xml;
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21 | using System.Xml.Linq;
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22 |
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23 | namespace Codeplex.Data
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24 | {
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25 | public class DynamicJson : DynamicObject
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26 | {
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27 | private enum JsonType
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28 | {
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29 | @string, number, boolean, @object, array, @null
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30 | }
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31 |
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32 | // public static methods
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33 |
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34 | /// <summary>from JsonSring to DynamicJson</summary>
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35 | public static dynamic Parse(string json)
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36 | {
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37 | return Parse(json, Encoding.Unicode);
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38 | }
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39 |
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40 | /// <summary>from JsonSring to DynamicJson</summary>
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41 | public static dynamic Parse(string json, Encoding encoding)
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42 | {
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43 | using (var reader = JsonReaderWriterFactory.CreateJsonReader(encoding.GetBytes(json), XmlDictionaryReaderQuotas.Max))
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44 | {
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45 | return ToValue(XElement.Load(reader));
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46 | }
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47 | }
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48 |
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49 | /// <summary>from JsonSringStream to DynamicJson</summary>
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50 | public static dynamic Parse(Stream stream)
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51 | {
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52 | using (var reader = JsonReaderWriterFactory.CreateJsonReader(stream, XmlDictionaryReaderQuotas.Max))
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53 | {
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54 | return ToValue(XElement.Load(reader));
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55 | }
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56 | }
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57 |
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58 | /// <summary>from JsonSringStream to DynamicJson</summary>
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59 | public static dynamic Parse(Stream stream, Encoding encoding)
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60 | {
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61 | using (var reader = JsonReaderWriterFactory.CreateJsonReader(stream, encoding, XmlDictionaryReaderQuotas.Max, _ => { }))
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62 | {
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63 | return ToValue(XElement.Load(reader));
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64 | }
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65 | }
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66 |
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67 | /// <summary>create JsonSring from primitive or IEnumerable or Object({public property name:property value})</summary>
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68 | public static string Serialize(object obj)
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69 | {
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70 | return CreateJsonString(new XStreamingElement("root", CreateTypeAttr(GetJsonType(obj)), CreateJsonNode(obj)));
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71 | }
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72 |
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73 | // private static methods
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74 |
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75 | private static dynamic ToValue(XElement element)
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76 | {
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77 | var type = (JsonType)Enum.Parse(typeof(JsonType), element.Attribute("type").Value);
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78 | switch (type)
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79 | {
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80 | case JsonType.boolean:
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81 | return (bool)element;
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82 | case JsonType.number:
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83 | return (double)element;
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84 | case JsonType.@string:
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85 | return (string)element;
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86 | case JsonType.@object:
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87 | case JsonType.array:
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88 | return new DynamicJson(element, type);
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89 | case JsonType.@null:
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90 | default:
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91 | return null;
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92 | }
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93 | }
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94 |
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95 | private static JsonType GetJsonType(object obj)
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96 | {
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97 | if (obj == null) return JsonType.@null;
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98 |
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99 | switch (Type.GetTypeCode(obj.GetType()))
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100 | {
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101 | case TypeCode.Boolean:
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102 | return JsonType.boolean;
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103 | case TypeCode.String:
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104 | case TypeCode.Char:
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105 | case TypeCode.DateTime:
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106 | return JsonType.@string;
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107 | case TypeCode.Int16:
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108 | case TypeCode.Int32:
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109 | case TypeCode.Int64:
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110 | case TypeCode.UInt16:
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111 | case TypeCode.UInt32:
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112 | case TypeCode.UInt64:
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113 | case TypeCode.Single:
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114 | case TypeCode.Double:
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115 | case TypeCode.Decimal:
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116 | case TypeCode.SByte:
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117 | case TypeCode.Byte:
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118 | return JsonType.number;
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119 | case TypeCode.Object:
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120 | return (obj is IEnumerable) ? JsonType.array : JsonType.@object;
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121 | case TypeCode.DBNull:
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122 | case TypeCode.Empty:
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123 | default:
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124 | return JsonType.@null;
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125 | }
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126 | }
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127 |
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128 | private static XAttribute CreateTypeAttr(JsonType type)
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129 | {
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130 | return new XAttribute("type", type.ToString());
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131 | }
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132 |
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133 | private static object CreateJsonNode(object obj)
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134 | {
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135 | var type = GetJsonType(obj);
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136 | switch (type)
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137 | {
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138 | case JsonType.@string:
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139 | case JsonType.number:
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140 | return obj;
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141 | case JsonType.boolean:
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142 | return obj.ToString().ToLower();
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143 | case JsonType.@object:
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144 | return CreateXObject(obj);
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145 | case JsonType.array:
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146 | return CreateXArray(obj as IEnumerable);
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147 | case JsonType.@null:
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148 | default:
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149 | return null;
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150 | }
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151 | }
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152 |
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153 | private static IEnumerable<XStreamingElement> CreateXArray<T>(T obj) where T : IEnumerable
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154 | {
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155 | return obj.Cast<object>()
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156 | .Select(o => new XStreamingElement("item", CreateTypeAttr(GetJsonType(o)), CreateJsonNode(o)));
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157 | }
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158 |
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159 | private static IEnumerable<XStreamingElement> CreateXObject(object obj)
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160 | {
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161 | return obj.GetType()
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162 | .GetProperties(BindingFlags.Public | BindingFlags.Instance)
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163 | .Select(pi => new { Name = pi.Name, Value = pi.GetValue(obj, null) })
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164 | .Select(a => new XStreamingElement(a.Name, CreateTypeAttr(GetJsonType(a.Value)), CreateJsonNode(a.Value)));
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165 | }
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166 |
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167 | private static string CreateJsonString(XStreamingElement element)
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168 | {
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169 | using (var ms = new MemoryStream())
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170 | using (var writer = JsonReaderWriterFactory.CreateJsonWriter(ms, Encoding.Unicode))
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171 | {
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172 | element.WriteTo(writer);
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173 | writer.Flush();
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174 | return Encoding.Unicode.GetString(ms.ToArray());
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175 | }
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176 | }
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177 |
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178 | // dynamic structure represents JavaScript Object/Array
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179 |
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180 | readonly XElement xml;
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181 | readonly JsonType jsonType;
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182 |
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183 | /// <summary>create blank JSObject</summary>
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184 | public DynamicJson()
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185 | {
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186 | xml = new XElement("root", CreateTypeAttr(JsonType.@object));
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187 | jsonType = JsonType.@object;
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188 | }
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189 |
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190 | private DynamicJson(XElement element, JsonType type)
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191 | {
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192 | Debug.Assert(type == JsonType.array || type == JsonType.@object);
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193 |
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194 | xml = element;
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195 | jsonType = type;
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196 | }
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197 |
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198 | public bool IsObject { get { return jsonType == JsonType.@object; } }
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199 |
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200 | public bool IsArray { get { return jsonType == JsonType.array; } }
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201 |
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202 | /// <summary>has property or not</summary>
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203 | public bool IsDefined(string name)
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204 | {
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205 | return IsObject && (xml.Element(name) != null);
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206 | }
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207 |
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208 | /// <summary>has property or not</summary>
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209 | public bool IsDefined(int index)
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210 | {
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211 | return IsArray && (xml.Elements().ElementAtOrDefault(index) != null);
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212 | }
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213 |
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214 | /// <summary>delete property</summary>
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215 | public bool Delete(string name)
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216 | {
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217 | var elem = xml.Element(name);
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218 | if (elem != null)
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219 | {
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220 | elem.Remove();
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221 | return true;
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222 | }
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223 | else return false;
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224 | }
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225 |
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226 | /// <summary>delete property</summary>
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227 | public bool Delete(int index)
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228 | {
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229 | var elem = xml.Elements().ElementAtOrDefault(index);
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230 | if (elem != null)
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231 | {
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232 | elem.Remove();
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233 | return true;
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234 | }
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235 | else return false;
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236 | }
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237 |
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238 | /// <summary>mapping to Array or Class by Public PropertyName</summary>
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239 | public T Deserialize<T>()
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240 | {
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241 | return (T)Deserialize(typeof(T));
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242 | }
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243 |
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244 | private object Deserialize(Type type)
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245 | {
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246 | return (IsArray) ? DeserializeArray(type) : DeserializeObject(type);
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247 | }
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248 |
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249 | private dynamic DeserializeValue(XElement element, Type elementType)
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250 | {
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251 | var value = ToValue(element);
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252 | if (value is DynamicJson)
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253 | {
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254 | value = ((DynamicJson)value).Deserialize(elementType);
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255 | }
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256 | return Convert.ChangeType(value, elementType);
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257 | }
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258 |
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259 | private object DeserializeObject(Type targetType)
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260 | {
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261 | var result = Activator.CreateInstance(targetType);
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262 | var dict = targetType.GetProperties(BindingFlags.Public | BindingFlags.Instance)
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263 | .Where(p => p.CanWrite)
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264 | .ToDictionary(pi => pi.Name, pi => pi);
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265 | foreach (var item in xml.Elements())
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266 | {
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267 | PropertyInfo propertyInfo;
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268 | if (!dict.TryGetValue(item.Name.LocalName, out propertyInfo)) continue;
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269 | var value = DeserializeValue(item, propertyInfo.PropertyType);
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270 | propertyInfo.SetValue(result, value, null);
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271 | }
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272 | return result;
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273 | }
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274 |
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275 | private object DeserializeArray(Type targetType)
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276 | {
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277 | if (targetType.IsArray) // Foo[]
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278 | {
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279 | var elemType = targetType.GetElementType();
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280 | dynamic array = Array.CreateInstance(elemType, xml.Elements().Count());
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281 | var index = 0;
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282 | foreach (var item in xml.Elements())
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283 | {
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284 | array[index++] = DeserializeValue(item, elemType);
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285 | }
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286 | return array;
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287 | }
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288 | else // List<Foo>
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289 | {
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290 | var elemType = targetType.GetGenericArguments()[0];
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291 | dynamic list = Activator.CreateInstance(targetType);
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292 | foreach (var item in xml.Elements())
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293 | {
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294 | list.Add(DeserializeValue(item, elemType));
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295 | }
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296 | return list;
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297 | }
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298 | }
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299 |
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300 | // Delete
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301 | public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
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302 | {
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303 | result = (IsArray)
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304 | ? Delete((int)args[0])
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305 | : Delete((string)args[0]);
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306 | return true;
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307 | }
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308 |
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309 | // IsDefined, if has args then TryGetMember
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310 | public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
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311 | {
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312 | if (args.Length > 0)
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313 | {
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314 | result = null;
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315 | return false;
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316 | }
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317 |
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318 | result = IsDefined(binder.Name);
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319 | return true;
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320 | }
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321 |
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322 | // Deserialize or foreach(IEnumerable)
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323 | public override bool TryConvert(ConvertBinder binder, out object result)
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324 | {
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325 | if (binder.Type == typeof(IEnumerable) || binder.Type == typeof(object[]))
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326 | {
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327 | var ie = (IsArray)
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328 | ? xml.Elements().Select(x => ToValue(x))
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329 | : xml.Elements().Select(x => (dynamic)new KeyValuePair<string, object>(x.Name.LocalName, ToValue(x)));
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330 | result = (binder.Type == typeof(object[])) ? ie.ToArray() : ie;
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331 | }
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332 | else
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333 | {
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334 | result = Deserialize(binder.Type);
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335 | }
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336 | return true;
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337 | }
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338 |
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339 | private bool TryGet(XElement element, out object result)
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340 | {
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341 | if (element == null)
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342 | {
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343 | result = null;
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344 | return false;
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345 | }
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346 |
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347 | result = ToValue(element);
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348 | return true;
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349 | }
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350 |
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351 | public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
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352 | {
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353 | return (IsArray)
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354 | ? TryGet(xml.Elements().ElementAtOrDefault((int)indexes[0]), out result)
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355 | : TryGet(xml.Element((string)indexes[0]), out result);
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356 | }
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357 |
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358 | public override bool TryGetMember(GetMemberBinder binder, out object result)
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359 | {
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360 | return (IsArray)
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361 | ? TryGet(xml.Elements().ElementAtOrDefault(int.Parse(binder.Name)), out result)
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362 | : TryGet(xml.Element(binder.Name), out result);
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363 | }
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364 |
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365 | private bool TrySet(string name, object value)
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366 | {
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367 | var type = GetJsonType(value);
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368 | var element = xml.Element(name);
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369 | if (element == null)
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370 | {
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371 | xml.Add(new XElement(name, CreateTypeAttr(type), CreateJsonNode(value)));
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372 | }
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373 | else
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374 | {
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375 | element.Attribute("type").Value = type.ToString();
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376 | element.ReplaceNodes(CreateJsonNode(value));
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377 | }
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378 |
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379 | return true;
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380 | }
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381 |
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382 | private bool TrySet(int index, object value)
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383 | {
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384 | var type = GetJsonType(value);
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385 | var e = xml.Elements().ElementAtOrDefault(index);
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386 | if (e == null)
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387 | {
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388 | xml.Add(new XElement("item", CreateTypeAttr(type), CreateJsonNode(value)));
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389 | }
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390 | else
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391 | {
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392 | e.Attribute("type").Value = type.ToString();
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393 | e.ReplaceNodes(CreateJsonNode(value));
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394 | }
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395 |
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396 | return true;
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397 | }
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398 |
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399 | public override bool TrySetIndex(SetIndexBinder binder, object[] indexes, object value)
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400 | {
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401 | return (IsArray)
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402 | ? TrySet((int)indexes[0], value)
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403 | : TrySet((string)indexes[0], value);
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404 | }
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405 |
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406 | public override bool TrySetMember(SetMemberBinder binder, object value)
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407 | {
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408 | return (IsArray)
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409 | ? TrySet(int.Parse(binder.Name), value)
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410 | : TrySet(binder.Name, value);
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411 | }
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412 |
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413 | public override IEnumerable<string> GetDynamicMemberNames()
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414 | {
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415 | return (IsArray)
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416 | ? xml.Elements().Select((x, i) => i.ToString())
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417 | : xml.Elements().Select(x => x.Name.LocalName);
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418 | }
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419 |
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420 | /// <summary>Serialize to JsonString</summary>
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421 | public override string ToString()
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422 | {
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423 | // <foo type="null"></foo> is can't serialize. replace to <foo type="null" />
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424 | foreach (var elem in xml.Descendants().Where(x => x.Attribute("type").Value == "null"))
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425 | {
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426 | elem.RemoveNodes();
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427 | }
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428 | return CreateJsonString(new XStreamingElement("root", CreateTypeAttr(jsonType), xml.Elements()));
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429 | }
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430 | }
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431 | }
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