c#生成json类

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Web.Script.Serialization;
namespace json
{
    /**//// <summary>
    /// JSONHelper 的摘要说明
    /// </summary>
    public class Json
    {
        public bool success = true;
        public string error = string.Empty;
        public string singleInfo = string.Empty;
        protected System.Collections.ArrayList arrData;
        protected System.Collections.ArrayList arrDataItem;
        public Json()
        {
            arrData = new ArrayList();
            arrDataItem = new ArrayList();
        }

        //重置，每次新生成一个json对象时必须执行该方法
        public void Reset()
        {
            success = true;
            error = string.Empty;
            singleInfo = string.Empty;
            arrData.Clear();
            arrDataItem.Clear();
        }

        /// <summary>
        /// 添加data数组中一个元素（js对象）的一个名值对，例如
        ///对于一个数组元素：{userName:"supNate",userId:"1"}
        ///需执行两次AddItem：
        ///AddItem("userName","supNate");
        ///AddItem("userId","1");
        ///最后执行
        ///ItemOk();
        //表示数组元素添加完毕，底下的AddItem表示另一个数组元素的开始
        /// </summary>
        /// <param name="name"></param>
        /// <param name="_value"></param>

        public void AddItem(string name, string _value)
        {
            arrDataItem.Add(name);
            arrDataItem.Add(_value.Replace("\"", "\\\""));
        }

        //一个数组元素添加完毕（data数组）
        public void ItemOk()
        {
            arrData.Add(arrDataItem);
            arrDataItem = new ArrayList();
        }

        //得到返回的json代码
        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("{");
            sb.Append("success:" + success.ToString() + ",");
            sb.Append("error:\"" + error + "\",");
            sb.Append("singleInfo:\"" + singleInfo + "\",");
            sb.Append("data:[");

            for (int i = 0; i < arrData.Count; i++)
            {
                ArrayList arr = (ArrayList)arrData[i];
                sb.Append("{");
                for (int j = 0; j < arr.Count; j += 2)
                {
                    if (j == arr.Count) break;
                    sb.Append((string)arr[j]);
                    sb.Append(":");
                    sb.Append("\"");
                    sb.Append((string)arr[j + 1]);
                    sb.Append("\"");
                    if (j < arr.Count - 2) sb.Append(",");
                }
                sb.Append("}");
                if (i < arrData.Count - 1) sb.Append(",");
            }
            sb.Append("]");
            sb.Append("}");
            return sb.ToString();
        }
    }
}