ASP.NET中XML转JSON的方法实例

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：

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(); 
}

希望本文所述对大家的asp.net程序设计有所帮助。