C#使用Jquery zTree实现树状结构显示 异步数据加载

<link href="zTree_v3-master/css/zTreeStyle/zTreeStyle.css" rel="stylesheet" />
 <script src="zTree_v3-master/js/jquery.ztree.core.js" type="text/javascript"></script>
 <script language="JavaScript" type="text/javascript">
 var setting = {
  async: {
   enable: true,
   url: "../Handler/ShoppingHandler.ashx", //请求的一般处理程序
   autoParam: ["id"],       //自带参数id--来自于节点id
   otherParam: { "type": "GetUserLevelList" }, //其他参数自定义
   dataFilter: filter, //数据过滤
   type: "post" //请求方式
  }
 };

 function filter(treeId, parentNode, childNodes) {
  if (!childNodes) return null;
  for (var i = 0, l = childNodes.length; i < l; i++) {
   childNodes[i].name = childNodes[i].name.replace(/\.n/g, '.');
  }
  return childNodes;
 }

 $(document).ready(function () {
  $.fn.zTree.init($("#treeDemo"), setting); //渲染树结构
 });
 </script>
<div class="zTreeDemoBackground left">
  <ul id="treeDemo" class="ztree"></ul>
</div>

using MobileBusiness.Common.Data;
using MobileBusiness.Library.Passport;
using MobileBusiness.Shopping.Data;
using MobileBusiness.Shopping.Data.Common;
using MobileBusiness.Shopping.Data.Entity;
using MobileBusiness.Web.Library.Script;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using ShoppingData = MobileBusiness.Shopping.Data.Entity;

namespace MobileBusiness.Shopping.BusinessManage.Handler
{
 /// <summary>
 /// Shopping 的摘要说明
 /// </summary>
 public class ShoppingHandler : IHttpHandler
 {
  //当前登录用户信息
  WeChatUser weChatUser = WeChatIdentity.CurrentUser;

  public void ProcessRequest(HttpContext context)
  {
   string result = "";
   if (context.Request["type"] != null)
   {
    string requestType = context.Request["type"];

    try
    {
     switch (requestType)
     {
      //获取用户信息等级列表
      case "GetUserLevelList":
       result = this.GetUserLevelList(context); break;
      default:
       break;
     }
    }
    catch (Exception ex)
    {
     result = ex.Message;
    }
   }

   context.Response.ContentType = "text/html";
   context.Response.Write(result);
   context.Response.End();
  }

  private string GetUserLevelList(HttpContext context)
  {
   string parentUserPhone = context.Request["id"];
   return GetUserCollByPhone(parentUserPhone);
  }
  private string GetUserCollByPhone(string phone)
  {
   //编码，父编码，名称，是否打开，打开图片，关闭图片
   //{ id:1, pId:0, name:"展开、折叠 自定义图标不同", open:true, iconOpen:"../../../css/zTreeStyle/img/diy/1_open.png", iconClose:"../../../css/zTreeStyle/img/diy/1_close.png"},
   //编码，父编码，名称，是否打开，显示图片
   //{ id: 11, pId: 1, name: "叶子节点1", icon: "../../../css/zTreeStyle/img/diy/2.png"},
   List<object> result = new List<object>();

   ShoppingData.UserInfoCollection userColl = ShoppingData.UserInfoAdapter.Instance.LoadByParentUserPhone(phone);
   userColl.ForEach(user =>
   {
    result.Add(new
    {
     id = user.Phone,
     pid = phone,
     name = user.UserName,
     isParent = ShoppingData.UserInfoAdapter.Instance.LoadByParentUserPhone(user.Phone).Count > 0 ? true : false
    });
   });
   return JsonConvert.SerializeObject(result);
  }
  public bool IsReusable
  {
   get
   {
    return false;
   }
  }
 }
}