XmlToJson-xml对象转换为Json对象类代码,C#代码库,德仔网

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【C#】 XmlToJson-xml对象转换为Json对象类
作者:大卫 / 发布于2016/7/27/ 255
using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Xml;  
using System.Collections;  
  
namespace Framework  
{  
    /// <summary>  
    /// 将xml转换为json  
    /// </summary>  
    public class XmlToJson  
    {  
        /// <summary>  
        /// 将xml转换为json  
        /// </summary>  
        /// <param name="xmlFile">xml文件</param>  
        /// <returns></returns>  
        public static string XmlToJSON(string xmlFile)  
        {  
            XmlDocument doc = new XmlDocument();  
            doc.Load(xmlFile);  
            return XmlToJSON(doc);  
        }  
  
        /// <summary>  
        /// 将xml转换为json  
        /// </summary>  
        /// <param name="xmlDoc">xml文档</param>  
        /// <returns></returns>  
        public 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();  
        }  
    }  
}
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