使用本文中的JSONConvert类可将任意JSON字符串转化为JSONObject或JSONArray对象，并获取需要的值，克服了.NET自带JSON类反序列化时需知道并引用序列化时使用的类的缺点。当然，也可以使用JSONConvert类进行序列化，构造出JSON字符串。

注意：如果Json数据中有空字符串，如""，则无法解析

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace TestJson
{
    /// <summary>
    /// 类  名：JSONConvert
    /// 描  述：JSON解析类
    /// 编  写：wufeng
    /// 日  期：2010-10-21
    /// 版  本：1.1.0
    /// </summary>
    public static class JSONConvert
    {
        #region 全局变量
        private static JSONObject _json = new JSONObject();//寄存器
        private static readonly string _SEMICOLON = "@semicolon";//分号转义符
        private static readonly string _COMMA = "@comma"; //逗号转义符
        #endregion
        #region 字符串转义
        /// <summary>
        /// 字符串转义,将双引号内的:和,分别转成_SEMICOLON和_COMMA
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        private static string StrEncode(string text)
        {
            MatchCollection matches = Regex.Matches(text, "\\\"[^\\\"]+\\\"");
            foreach (Match match in matches)
            {
                text = text.Replace(match.Value, match.Value.Replace(":", _SEMICOLON).Replace(",", _COMMA));
            }
            return text;
        }
        /// <summary>
        /// 字符串转义,将_SEMICOLON和_COMMA分别转成:和,
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        private static string StrDecode(string text)
        {
            return text.Replace(_SEMICOLON, ":").Replace(_COMMA, ",");
        }
        #endregion
        #region JSON最小单元解析
        /// <summary>
        /// 最小对象转为JSONObject
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        private static JSONObject DeserializeSingletonObject(string text)
        {
            JSONObject jsonObject = new JSONObject();
            MatchCollection matches = Regex.Matches(text, "(\\\"(?<key>[^\\\"]+)\\\":\\\"(?<value>[^,\\\"]*)\\\")|(\\\"(?<key>[^\\\"]+)\\\":(?<value>[^,\\\"\\}]*))");
            foreach (Match match in matches)
            {
                string value = match.Groups["value"].Value;
                jsonObject.Add(match.Groups["key"].Value, _json.ContainsKey(value) ? _json[value] : StrDecode(value));
            }
            return jsonObject;
        }
        /// <summary>
        /// 最小数组转为JSONArray
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        private static JSONArray DeserializeSingletonArray(string text)
        {
            JSONArray jsonArray = new JSONArray();
            MatchCollection matches = Regex.Matches(text, "(\\\"(?<value>[^,\\\"]+)\")|(?<value>[^,\\[\\]]+)");
            foreach (Match match in matches)
            {
                string value = match.Groups["value"].Value;
                jsonArray.Add(_json.ContainsKey(value) ? _json[value] : StrDecode(value));
            }
            return jsonArray;
        }
        /// <summary>
        /// 反序列化
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        private static string Deserialize(string text)
        {
            text = StrEncode(text);//转义;和,
            int count = 0;
            string key = string.Empty;
            string pattern = "(\\{[^\\[\\]\\{\\}]+\\})|(\\[[^\\[\\]\\{\\}]+\\])";
            while (Regex.IsMatch(text, pattern))
            {
                MatchCollection matches = Regex.Matches(text, pattern);
                foreach (Match match in matches)
                {
                    key = "___key" + count + "___";
                    if (match.Value.Substring(0, 1) == "{")
                        _json.Add(key, DeserializeSingletonObject(match.Value));
                    else
                        _json.Add(key, DeserializeSingletonArray(match.Value));
                    text = text.Replace(match.Value, key);
                    count++;
                }
            }
            return text;
        }
        #endregion
        #region 公共接口
        /// <summary>
        /// 序列化JSONObject对象
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static JSONObject DeserializeObject(string text)
        {
            return _json[Deserialize(text)] as JSONObject;
        }
        /// <summary>
        /// 序列化JSONArray对象
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static JSONArray DeserializeArray(string text)
        {
            return _json[Deserialize(text)] as JSONArray;
        }
        /// <summary>
        /// 反序列化JSONObject对象
        /// </summary>
        /// <param name="jsonObject"></param>
        /// <returns></returns>
        public static string SerializeObject(JSONObject jsonObject)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("{");
            foreach (KeyValuePair<string, object> kvp in jsonObject)
            {
                if (kvp.Value is JSONObject)
                {
                    sb.Append(string.Format("\"{0}\":{1},", kvp.Key, SerializeObject((JSONObject)kvp.Value)));
                }
                else if (kvp.Value is JSONArray)
                {
                    sb.Append(string.Format("\"{0}\":{1},", kvp.Key, SerializeArray((JSONArray)kvp.Value)));
                }
                else if (kvp.Value is String)
                {
                    sb.Append(string.Format("\"{0}\":\"{1}\",", kvp.Key, kvp.Value));
                }
                else
                {
                    sb.Append(string.Format("\"{0}\":\"{1}\",", kvp.Key, ""));
                }
            }
            if (sb.Length > 1)
                sb.Remove(sb.Length - 1, 1);
            sb.Append("}");
            return sb.ToString();
        }
        /// <summary>
        /// 反序列化JSONArray对象
        /// </summary>
        /// <param name="jsonArray"></param>
        /// <returns></returns>
        public static string SerializeArray(JSONArray jsonArray)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("[");
            for (int i = 0; i < jsonArray.Count; i++)
            {
                if (jsonArray[i] is JSONObject)
                {
                    sb.Append(string.Format("{0},", SerializeObject((JSONObject)jsonArray[i])));
                }
                else if (jsonArray[i] is JSONArray)
                {
                    sb.Append(string.Format("{0},", SerializeArray((JSONArray)jsonArray[i])));
                }
                else if (jsonArray[i] is String)
                {
                    sb.Append(string.Format("\"{0}\",", jsonArray[i]));
                }
                else
                {
                    sb.Append(string.Format("\"{0}\",", ""));
                }
            }
            if (sb.Length > 1)
                sb.Remove(sb.Length - 1, 1);
            sb.Append("]");
            return sb.ToString();
        }
        #endregion
    }
    /// <summary>
    /// 类  名：JSONObject
    /// 描  述：JSON对象类
    /// 编  写：wufeng
    /// 日  期：2010-10-21
    /// 版  本：1.1.0
    /// 更新历史：
    ///     2010-10-21  继承Dictionary<TKey, TValue>代替this[]
    /// </summary>
    public class JSONObject : Dictionary<string, object>
    { }
    /// <summary>
    /// 类  名：JSONArray
    /// 描  述：JSON数组类
    /// 编  写：wufeng
    /// 日  期：2010-10-21
    /// 版  本：1.1.0
    /// 更新历史：
    ///     2010-10-21  继承List<T>代替this[]
    /// </summary>
    public class JSONArray : List<object>
    { }
}

控制台调用示例

            //序列化
            JSONArray _array = new JSONArray();
            _array.Add("1");
            _array.Add("2");
            _array.Add("3");
            _array.Add("4");
            JSONObject _object = new JSONObject();//新建json对象作为内嵌
            _object.Add("oneKey", "one");
            _object.Add("twoArray", _array);
            JSONArray jsonArray = new JSONArray();
            jsonArray.Add("2006");
            jsonArray.Add("2007");
            jsonArray.Add("2008");
            jsonArray.Add("2009");
            jsonArray.Add("2010");
            JSONObject jsonObject = new JSONObject();
            jsonObject.Add("domain", "mzwu.com");
            jsonObject.Add("two", _object);//添加json对象
            jsonObject.Add("years", jsonArray);
            Console.WriteLine("json序列化为字符串");
            Console.WriteLine(JSONConvert.SerializeObject(jsonObject));//执行序列化
            //反序列化
            JSONObject json = JSONConvert.DeserializeObject("{"domain":"mzwu.com","two":{"oneKey":"one","twoArray":[1,2,3,4]},"years":[2006,2007,2008,2009,2010]}");//执行反序列化
            if (json != null)
            {
                Console.WriteLine("将json结构的字符串反序列化为json对象并调用");
                Console.WriteLine(json["domain"]);
                Console.WriteLine(((JSONObject)json["two"])["oneKey"]);
                Console.WriteLine(((JSONArray)((JSONObject)json["two"])["twoArray"])[0]);
                Console.WriteLine(((JSONArray)json["years"])[3]);
            }
            Console.ReadLine();

转自：http://blog.sina.com.cn/s/blog_69e8baad0100lun9.html