XML转json

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();

}

原文地址：http://www.phdcc.com/xml2json.htm