Asp.net生成Extjs-Tree数据格式的json类

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
//using System.Web.Script.Serialization;
using System.Runtime.Serialization;

///
/// JSONHelper 的摘要说明
///
public class DTreeJSONHelper
{
    //对应JSON的singleInfo成员
    public string singleInfo = string.Empty;

    protected string _error = string.Empty;
    protected bool _success = true;
    protected long _totalCount = 0;
    protected System.Collections.ArrayList arrData = new ArrayList();
    protected System.Collections.ArrayList arrDataItem = new ArrayList();

    public DTreeJSONHelper()
    {

    }

    //public static string ToJSON(object obj)
    //{
    //    JavaScriptSerializer serializer = new JavaScriptSerializer();
    //    return serializer.Serialize(obj);
    //}

    //public static string ToJSON(object obj, int recursionDepth)
    //{
    //    JavaScriptSerializer serializer = new JavaScriptSerializer();
    //    serializer.RecursionLimit = recursionDepth;
    //    return serializer.Serialize(obj);
    //}

    //对应于JSON的success成员
    public bool success
    {
        get
        {
            return _success;
        }
        set
        {
            //如设置为true则清空error
            if (success) _error = string.Empty;
            _success = value;
        }
    }

    //对应于JSON的error成员
    public string error
    {
        get
        {
            return _error;
        }
        set
        {
            //如设置error，则自动设置success为false
            if (value != "") _success = false;
            _error = value;
        }
    }

    public long totlalCount
    {
        get { return _totalCount; }
        set { _totalCount = value; }
    }

    //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();
    }

 

    public void AddItem(string name, string value)
    {
        if (name == "checked" && value == "1")
        {
            value = "true";
            arrData.Add("'" + name + "':" + "" + value + "");
        }
        else if (name == "checked" && value == "0")
        {
            value = "false";
            arrData.Add("'" + name + "':" + "" + value + "");
        }
        else if (name == "leaf" && value=="1")
        {
            value = "true";
            arrData.Add("'" + name + "':" + "" + value + "");
        }
        else if (name == "leaf" && value == "0")
        {
            value = "false";
            arrData.Add("'" + name + "':" + "" + value + "");
        }
        else
        {
            arrData.Add("'" + name + "':\"" + "" + value + "\"");
        }
      
    }

 

    public void ItemOk()
    {
        arrData.Add("
");
        //返回总记录条数
        totlalCount++;
    }

    //序列化JSON对象，得到返回的JSON代码
    public override string ToString()
    {
        StringBuilder sb = new StringBuilder();
        sb.Append("[");
      
        int index = 0;
        sb.Append("{");
        if (arrData.Count <= 0)
        {
            sb.Append("}");
        }
        else
        {
            foreach (string val in arrData)
            {
              

                index++;

                if (val != "
")
                {
                    sb.Append(val + ",");
                }
                else
                {
                    sb = sb.Replace(",", "", sb.Length - 1, 1);
                    sb.Append("},");
                    if (index < arrData.Count)
                    {
                        sb.Append("{");
                    }
                }

            }
            sb = sb.Replace(",", "", sb.Length - 1, 1);
            sb.Append("");
        }

        sb.Append("]");
        return sb.ToString();
    }
}

//=============================================调用例子=============================

using System;
using System.Collections.Generic;
using System.Text;
//using Model;
using DAL;
using System.Data;

namespace BLL
{
    public class MenuTree
    {
        private DataSet ds;
        DAL.MenuTree dao = new DAL.MenuTree();

        //查询权限树信息
        public string GetDtreeInfos(string parentID)
        {
            string DTreeJSON="";
            DTreeJSONHelper json = new DTreeJSONHelper();
            try
            {
                ds=dao.getDTreeInfo(parentID);
                json.success = true;
                foreach(DataRow dr in ds.Tables[0].Rows)
                {
                    json.AddItem("href", dr["href"].ToString());
                    json.AddItem("hrefTarget", "MainFram");
                    json.AddItem("id", dr["id"].ToString());
                    //json.AddItem("parentid", dr["parentid"].ToString());
                    json.AddItem("text", dr["title"].ToString());
                    json.AddItem("leaf", dr["leaf"].ToString());
                    //json.AddItem("icon", dr["icon"].ToString());
                    //json.AddItem("number", dr["number"].ToString());
                    json.AddItem("qtip", dr["title"].ToString());
                    //json.AddItem("checked", "1");
                  
                    json.ItemOk();
                }
                DTreeJSON = json.ToString();
            }
            catch (Exception)
            {
               
                throw;
            }
            return DTreeJSON;
        }
    }
}