我要评论本文实例讲述了asp.net中xml转json的方法，分享给大家供大家参考。具体如下：
一般在许多应用程序中都将数据存储为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代码如下：
复制代码 代码如下:
private static string xmltojson(xmldocument xmldoc)
{
stringbuilder sbjson = new stringbuilder();
sbjson.append("{ ");
xmltojsonnode(sbjson, xmldoc.documentelement, true);
sbjson.append("}");
return sbjson.tostring();
}
// xmltojsonnode: output an xmlelement, possibly as part of a higher array
private static void xmltojsonnode(stringbuilder sbjson, xmlelement node, bool shownodename)
{
if (shownodename)
sbjson.append("\\"" + safejson(node.name) + "\\": ");
sbjson.append("{");
// build a sorted list of key-value pairs
// where key is case-sensitive nodename
// value is an arraylist of string or xmlelement
// so that we know whether the nodename is an array or not.
sortedlist childnodenames = new sortedlist();
// add in all node attributes
if( node.attributes!=null)
foreach (xmlattribute attr in node.attributes)
storechildnode(childnodenames,attr.name,attr.innertext);
// add in all nodes
foreach (xmlnode cnode in node.childnodes)
{
if (cnode is xmltext)
storechildnode(childnodenames, "value", cnode.innertext);
else if (cnode is xmlelement)
storechildnode(childnodenames, cnode.name, cnode);
}
// now output all stored info
foreach (string childname in childnodenames.keys)
{
arraylist alchild = (arraylist)childnodenames[childname];
if (alchild.count == 1)
outputnode(childname, alchild[0], sbjson, true);
else
{
sbjson.append(" \\"" + safejson(childname) + "\\": [ ");
foreach (object child in alchild)
outputnode(childname, child, sbjson, false);
sbjson.remove(sbjson.length - 2, 2);
sbjson.append(" ], ");
}
}
sbjson.remove(sbjson.length - 2, 2);
sbjson.append(" }");
}
// storechildnode: store data associated with each nodename
// so that we know whether the nodename is an array or not.
private static void storechildnode(sortedlist childnodenames, string nodename, object nodevalue)
{
// pre-process contraction of xmlelement-s
if (nodevalue is xmlelement)
{
// convert <aa></aa> into "aa":null
// <aa>xx</aa> into "aa":"xx"
xmlnode cnode = (xmlnode)nodevalue;
if( cnode.attributes.count == 0)
{
xmlnodelist children = cnode.childnodes;
if( children.count==0)
nodevalue = null;
else if (children.count == 1 && (children[0] is xmltext))
nodevalue = ((xmltext)(children[0])).innertext;
}
}
// add nodevalue to arraylist associated with each nodename
// if nodename doesn't exist then add it
object ovaluesal = childnodenames[nodename];
arraylist valuesal;
if (ovaluesal == null)
{
valuesal = new arraylist();
childnodenames[nodename] = valuesal;
}
else
valuesal = (arraylist)ovaluesal;
valuesal.add(nodevalue);
}
private static void outputnode(string childname, object alchild, stringbuilder sbjson, bool shownodename)
{
if (alchild == null)
{
if (shownodename)
sbjson.append("\\"" + safejson(childname) + "\\": ");
sbjson.append("null");
}
else if (alchild is string)
{
if (shownodename)
sbjson.append("\\"" + safejson(childname) + "\\": ");
string schild = (string)alchild;
schild = schild.trim();
sbjson.append("\\"" + safejson(schild) + "\\"");
}
else
xmltojsonnode(sbjson, (xmlelement)alchild, shownodename);
sbjson.append(", ");
}
// make a string safe for json
private static string safejson(string sin)
{
stringbuilder sbout = new stringbuilder(sin.length);
foreach (char ch in sin)
{
if (char.iscontrol(ch) || ch == '\\'')
{
int ich = (int)ch;
sbout.append(@"\\u" + ich.tostring("x4"));
continue;
}
else if (ch == '\\"' || ch == '\\\\' || ch == '/')
{
sbout.append('\\\\');
}
sbout.append(ch);
}
return sbout.tostring();
}
{
stringbuilder sbjson = new stringbuilder();
sbjson.append("{ ");
xmltojsonnode(sbjson, xmldoc.documentelement, true);
sbjson.append("}");
return sbjson.tostring();
}
// xmltojsonnode: output an xmlelement, possibly as part of a higher array
private static void xmltojsonnode(stringbuilder sbjson, xmlelement node, bool shownodename)
{
if (shownodename)
sbjson.append("\\"" + safejson(node.name) + "\\": ");
sbjson.append("{");
// build a sorted list of key-value pairs
// where key is case-sensitive nodename
// value is an arraylist of string or xmlelement
// so that we know whether the nodename is an array or not.
sortedlist childnodenames = new sortedlist();
// add in all node attributes
if( node.attributes!=null)
foreach (xmlattribute attr in node.attributes)
storechildnode(childnodenames,attr.name,attr.innertext);
// add in all nodes
foreach (xmlnode cnode in node.childnodes)
{
if (cnode is xmltext)
storechildnode(childnodenames, "value", cnode.innertext);
else if (cnode is xmlelement)
storechildnode(childnodenames, cnode.name, cnode);
}
// now output all stored info
foreach (string childname in childnodenames.keys)
{
arraylist alchild = (arraylist)childnodenames[childname];
if (alchild.count == 1)
outputnode(childname, alchild[0], sbjson, true);
else
{
sbjson.append(" \\"" + safejson(childname) + "\\": [ ");
foreach (object child in alchild)
outputnode(childname, child, sbjson, false);
sbjson.remove(sbjson.length - 2, 2);
sbjson.append(" ], ");
}
}
sbjson.remove(sbjson.length - 2, 2);
sbjson.append(" }");
}
// storechildnode: store data associated with each nodename
// so that we know whether the nodename is an array or not.
private static void storechildnode(sortedlist childnodenames, string nodename, object nodevalue)
{
// pre-process contraction of xmlelement-s
if (nodevalue is xmlelement)
{
// convert <aa></aa> into "aa":null
// <aa>xx</aa> into "aa":"xx"
xmlnode cnode = (xmlnode)nodevalue;
if( cnode.attributes.count == 0)
{
xmlnodelist children = cnode.childnodes;
if( children.count==0)
nodevalue = null;
else if (children.count == 1 && (children[0] is xmltext))
nodevalue = ((xmltext)(children[0])).innertext;
}
}
// add nodevalue to arraylist associated with each nodename
// if nodename doesn't exist then add it
object ovaluesal = childnodenames[nodename];
arraylist valuesal;
if (ovaluesal == null)
{
valuesal = new arraylist();
childnodenames[nodename] = valuesal;
}
else
valuesal = (arraylist)ovaluesal;
valuesal.add(nodevalue);
}
private static void outputnode(string childname, object alchild, stringbuilder sbjson, bool shownodename)
{
if (alchild == null)
{
if (shownodename)
sbjson.append("\\"" + safejson(childname) + "\\": ");
sbjson.append("null");
}
else if (alchild is string)
{
if (shownodename)
sbjson.append("\\"" + safejson(childname) + "\\": ");
string schild = (string)alchild;
schild = schild.trim();
sbjson.append("\\"" + safejson(schild) + "\\"");
}
else
xmltojsonnode(sbjson, (xmlelement)alchild, shownodename);
sbjson.append(", ");
}
// make a string safe for json
private static string safejson(string sin)
{
stringbuilder sbout = new stringbuilder(sin.length);
foreach (char ch in sin)
{
if (char.iscontrol(ch) || ch == '\\'')
{
int ich = (int)ch;
sbout.append(@"\\u" + ich.tostring("x4"));
continue;
}
else if (ch == '\\"' || ch == '\\\\' || ch == '/')
{
sbout.append('\\\\');
}
sbout.append(ch);
}
return sbout.tostring();
}
希望本文所述对大家的asp.net程序设计有所帮助。
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