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annotate MetroWpf/MetroWpf.Framework/Extensions/XmlNodeExtensions.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.Xml;
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3
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4 namespace MetroWpf
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5 {
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6 /// <summary>
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7 /// Extension methods for the XmlNode / XmlDocument classes and its sub classes
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8 /// </summary>
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9 public static class XmlNodeExtensions
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10 {
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11 #region · Extensions ·
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12
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13 /// <summary>
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14 /// Appends a child to a XML node
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15 /// </summary>
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16 /// <param name="parentNode">The parent node.</param>
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17 /// <param name="name">The name of the child node.</param>
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18 /// <returns>The newly cerated XML node</returns>
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19 public static XmlNode CreateChildNode(this XmlNode parentNode, string name)
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20 {
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21 XmlDocument document = (parentNode is XmlDocument ? (XmlDocument)parentNode : parentNode.OwnerDocument);
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22 XmlNode node = document.CreateElement(name);
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23
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24 parentNode.AppendChild(node);
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25
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26 return node;
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27 }
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28
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29 /// <summary>
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30 /// Appends a child to a XML node
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31 /// </summary>
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32 /// <param name="parentNode">The parent node.</param>
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33 /// <param name="name">The name of the child node.</param>
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34 /// <param name="namespaceUri">The node namespace.</param>
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35 /// <returns>The newly cerated XML node</returns>
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36 public static XmlNode CreateChildNode(this XmlNode parentNode, string name, string namespaceUri)
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37 {
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38 XmlDocument document = (parentNode is XmlDocument ? (XmlDocument)parentNode : parentNode.OwnerDocument);
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39 XmlNode node = document.CreateElement(name, namespaceUri);
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40
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41 parentNode.AppendChild(node);
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42
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43 return node;
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44 }
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45
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46 /// <summary>
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47 /// Appends a CData section to a XML node
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48 /// </summary>
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49 /// <param name="parentNode">The parent node.</param>
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50 /// <returns>The created CData Section</returns>
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51 public static XmlCDataSection CreateCDataSection(this XmlNode parentNode)
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52 {
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53 return parentNode.CreateCDataSection(string.Empty);
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54 }
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55
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56 /// <summary>
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57 /// Appends a CData section to a XML node and prefills the provided data
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58 /// </summary>
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59 /// <param name="parentNode">The parent node.</param>
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60 /// <param name="data">The CData section value.</param>
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61 /// <returns>The created CData Section</returns>
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62 public static XmlCDataSection CreateCDataSection(this XmlNode parentNode, string data)
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63 {
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64 XmlDocument document = (parentNode is XmlDocument ? (XmlDocument)parentNode : parentNode.OwnerDocument);
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65 XmlCDataSection node = document.CreateCDataSection(data);
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66
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67 parentNode.AppendChild(node);
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68
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69 return node;
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70 }
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71
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72 /// <summary>
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73 /// Returns the value of a nested CData section.
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74 /// </summary>
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75 /// <param name="parentNode">The parent node.</param>
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76 /// <returns>The CData section content</returns>
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77 public static string GetCDataSection(this XmlNode parentNode)
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78 {
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79 foreach (var node in parentNode.ChildNodes)
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80 {
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81 if (node is XmlCDataSection)
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82 {
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83 return ((XmlCDataSection)node).Value;
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84 }
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85 }
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86
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87 return null;
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88 }
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89
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90 /// <summary>
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91 /// Gets an attribute value
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92 /// </summary>
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93 /// <param name="node">The node.</param>
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94 /// <param name="attributeName">The Name of the attribute.</param>
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95 /// <returns>The attribute value</returns>
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96 public static string GetAttribute(this XmlNode node, string attributeName)
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97 {
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98 return GetAttribute(node, attributeName, null);
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99 }
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100
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101 /// <summary>
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102 /// Gets an attribute value
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103 /// </summary>
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104 /// <param name="node">The node.</param>
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105 /// <param name="attributeName">The Name of the attribute.</param>
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106 /// <param name="defaultValue">The default value to be returned if no matching attribute exists.</param>
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107 /// <returns>The attribute value</returns>
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108 public static string GetAttribute(this XmlNode node, string attributeName, string defaultValue)
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109 {
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110 XmlAttribute attribute = node.Attributes[attributeName];
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111
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112 return (attribute != null ? attribute.InnerText : defaultValue);
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113 }
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114
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115 /// <summary>
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116 /// Gets an attribute value converted to the specified data type
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117 /// </summary>
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118 /// <typeparam name="T">The desired return data type</typeparam>
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119 /// <param name="node">The node.</param>
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120 /// <param name="attributeName">The Name of the attribute.</param>
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121 /// <returns>The attribute value</returns>
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122 public static T GetAttribute<T>(this XmlNode node, string attributeName)
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123 {
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124 return GetAttribute<T>(node, attributeName, default(T));
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125 }
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126
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127 /// <summary>
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128 /// Gets an attribute value converted to the specified data type
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129 /// </summary>
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130 /// <typeparam name="T">The desired return data type</typeparam>
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131 /// <param name="node">The node.</param>
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132 /// <param name="attributeName">The Name of the attribute.</param>
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133 /// <param name="defaultValue">The default value to be returned if no matching attribute exists.</param>
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134 /// <returns>The attribute value</returns>
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135 public static T GetAttribute<T>(this XmlNode node, string attributeName, T defaultValue)
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136 {
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137 var value = GetAttribute(node, attributeName);
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138
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139 return (value.IsNotEmpty() ? value.ConvertTo<T>(defaultValue) : defaultValue);
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140 }
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141
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142 /// <summary>
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143 /// Creates or updates an attribute with the passed value.
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144 /// </summary>
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145 /// <param name="node">The node.</param>
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146 /// <param name="name">The name.</param>
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147 /// <param name="value">The value.</param>
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148 public static void SetAttribute(this XmlNode node, string name, object value)
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149 {
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150 SetAttribute(node, name, value != null ? value.ToString() : null);
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151 }
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152
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153 /// <summary>
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154 /// Creates or updates an attribute with the passed value.
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155 /// </summary>
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156 /// <param name="node">The node.</param>
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157 /// <param name="name">The name.</param>
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158 /// <param name="value">The value.</param>
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159 public static void SetAttribute(this XmlNode node, string name, string value)
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160 {
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161 if (node != null)
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162 {
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163 var attribute = node.Attributes[name, node.NamespaceURI];
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164
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165 if (attribute == null)
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166 {
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167 attribute = node.OwnerDocument.CreateAttribute(name, node.OwnerDocument.NamespaceURI);
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168 node.Attributes.Append(attribute);
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169 }
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170
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171 attribute.InnerText = value;
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172 }
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173 }
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174
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175 #endregion
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176 }
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177 }