asp.net中xml转JSON的方法

许多应用程序都将数据存储为XML的格式，而且会将数据以JSON的格式发送到客户端以做进一步处理。要实现这一点，它们必须将XML格式转换为JSON格式。

XML转JSON代码

1. PRivatestaticstringXmlToJSON(XmlDocumentxmlDoc)
2. {
3. StringBuildersbJSON=newStringBuilder();
4. sbJSON.Append("{");
5. XmlToJSONnode(sbJSON,xmlDoc.DocumentElement,true);
6. sbJSON.Append("}");
7. returnsbJSON.ToString();
8. }
10. //XmlToJSONnode:OutputanXmlElement,possiblyaspartofahigherarray
11. privatestaticvoidXmlToJSONnode(StringBuildersbJSON,XmlElementnode,boolshowNodeName)
12. {
13. if(showNodeName)
14. sbJSON.Append("\\""+SafeJSON(node.Name)+"\\":");
15. sbJSON.Append("{");
16. //Buildasortedlistofkey-valuepairs
17. //wherekeyiscase-sensitivenodeName
18. //valueisanArrayListofstringorXmlElement
19. //sothatweknowwhetherthenodeNameisanarrayornot.
20. SortedListchildNodeNames=newSortedList();
22. //Addinallnodeattributes
23. if(node.Attributes!=null)
24. foreach(XmlAttributeattrinnode.Attributes)
25. StoreChildNode(childNodeNames,attr.Name,attr.InnerText);
27. //Addinallnodes
28. foreach(XmlNodecnodeinnode.ChildNodes)
29. {
30. if(cnodeisXmlText)
31. StoreChildNode(childNodeNames,"value",cnode.InnerText);
32. elseif(cnodeisXmlElement)
33. StoreChildNode(childNodeNames,cnode.Name,cnode);
34. }
36. //Nowoutputallstoredinfo
37. foreach(stringchildnameinchildNodeNames.Keys)
38. {
39. ArrayListalChild=(ArrayList)childNodeNames[childname];
40. if(alChild.Count==1)
41. OutputNode(childname,alChild[0],sbJSON,true);
42. else
43. {
44. sbJSON.Append("\\""+SafeJSON(childname)+"\\":[");
45. foreach(objectChildinalChild)
46. OutputNode(childname,Child,sbJSON,false);
47. sbJSON.Remove(sbJSON.Length-2,2);
48. sbJSON.Append("],");
49. }
50. }
51. sbJSON.Remove(sbJSON.Length-2,2);
52. sbJSON.Append("}");
53. }
55. //StoreChildNode:StoredataassociatedwitheachnodeName
56. //sothatweknowwhetherthenodeNameisanarrayornot.
57. privatestaticvoidStoreChildNode(SortedListchildNodeNames,stringnodeName,objectnodeValue)
58. {
59. //Pre-processcontractionofXmlElement-s
60. if(nodeValueisXmlElement)
61. {
62. //Convert<aa></aa>into"aa":null
63. //<aa>xx</aa>into"aa":"xx"
64. XmlNodecnode=(XmlNode)nodeValue;
65. if(cnode.Attributes.Count==0)
66. {
67. XmlNodeListchildren=cnode.ChildNodes;
68. if(children.Count==0)
69. nodeValue=null;
70. elseif(children.Count==1&&(children[0]isXmlText))
71. nodeValue=((XmlText)(children[0])).InnerText;
72. }
73. }
74. //AddnodeValuetoArrayListassociatedwitheachnodeName
75. //IfnodeNamedoesn'texistthenaddit
76. objectoValuesAL=childNodeNames[nodeName];
77. ArrayListValuesAL;
78. if(oValuesAL==null)
79. {
80. ValuesAL=newArrayList();
81. childNodeNames[nodeName]=ValuesAL;
82. }
83. else
84. ValuesAL=(ArrayList)oValuesAL;
85. ValuesAL.Add(nodeValue);
86. }
88. privatestaticvoidOutputNode(stringchildname,objectalChild,StringBuildersbJSON,boolshowNodeName)
89. {
90. if(alChild==null)
91. {
92. if(showNodeName)
93. sbJSON.Append("\\""+SafeJSON(childname)+"\\":");
94. sbJSON.Append("null");
95. }
96. elseif(alChildisstring)
97. {
98. if(showNodeName)
99. sbJSON.Append("\\""+SafeJSON(childname)+"\\":");
100. stringsChild=(string)alChild;
101. sChild=sChild.Trim();
102. sbJSON.Append("\\""+SafeJSON(sChild)+"\\"");
103. }
104. else
105. XmlToJSONnode(sbJSON,(XmlElement)alChild,showNodeName);
106. sbJSON.Append(",");
107. }
109. //MakeastringsafeforJSON
110. privatestaticstringSafeJSON(stringsIn)
111. {
112. StringBuildersbOut=newStringBuilder(sIn.Length);
113. foreach(charchinsIn)
114. {
115. if(Char.IsControl(ch)||ch=='\\'')
116. {
117. intich=(int)ch;
118. sbOut.Append(@"\\u"+ich.ToString("x4"));
119. continue;
120. }
121. elseif(ch=='\\"'||ch=='\\\\'||ch=='/')
122. {
123. sbOut.Append('\\\\');
124. }
125. sbOut.Append(ch);
126. }
127. returnsbOut.ToString();
128. }