从数据库里面取值绑定到Ztree

<script src="/common/jquery-1.8.3.min.js" type="text/javascript"></script>
<link href="/Admin/tree/zTreeStyle.css" rel="stylesheet" type="text/css" />    
<script src="/Admin/tree/jquery.ztree.core-3.5.js" type="text/javascript"></script> 

<div style="margin:0 auto;border:1px solid #617775;background:#f0f6e4;578px;height:460px;  overflow:auto;">
    <ul   class="ztree"></ul>
</div>

<script type="text/javascript">
        var setting = {
            data: {
                key: {
                    //将treeNode的ItemName属性当做节点名称
                    name: "ItemName"        
                },
                simpleData: {
                    //是否使用简单数据模式
                    enable: true,
                    //当前节点id属性  
                    idKey: "Id",
                    //当前节点的父节点id属性 
                    pIdKey: "pItemId",
                    //用于修正根节点父节点数据，即pIdKey指定的属性值
                    rootPId: 0
                }
            },
            view: {
                //是否支持同时选中多个节点
                selectedMulti: false
            }
        };

        $(function () {
            $.post("test.aspx", function (json) {
                var treeObj = $.fn.zTree.init($("#tree"), setting, json);               
           //默认展开所有节点
                treeObj.expandAll(true);                
            });
        });       
    </script>

using System;
using System.Collections.Generic;
using System.Data;

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {        
        //在服务器端判断request来自Ajax请求(异步)还是传统请求(同步)
        if (Request.Headers["X-Requested-With"] != null && Request.Headers["X-Requested-With"].ToLower() == "XMLHttpRequest".ToLower())
        {           
            //清除缓冲区流中的所有内容输出
            Response.Clear();
            //设置输出流的HTTP MIMEl类型
            Response.ContentType = "application/json";
            //将一个字符串写入HTTP相应输出流
        　 Response.Write(GetJson());
        　//将当前所有缓冲的输出发送到客户端，停止该页的执行
            Response.End();
        }     
    }
    //序列化，将对象转化为JSON字符串
    protected string GetJson()
    {
        //为启用 AFAX 的应用程序提供序列化和反序列化功能
        System.Web.Script.Serialization.JavaScriptSerializer json = new System.Web.Script.Serialization.JavaScriptSerializer();
        List<Express.Model.AdminLeft> list = new List<Express.Model.AdminLeft>();
        //获取管理员模块列表
        list = Express.BLL.AdminLeft.GetList();
        //将对象转换为JSON字符串      
        return json.Serialize(list);       
    }
}

  /// <summary>
        /// 获取所有名称不为空的栏目
        /// </summary>
        public List<Model.AdminLeft> GetList()
        {
            string sql = string.Format("select * from AdminLeft where itemName<>'' order by case when pItemId=0 then Id*10000 else pItemId*10000+Id end");
            List<Model.AdminLeft> list = new List<Model.AdminLeft>();
            using (SqlDataReader dr = DBUtility.SqlHelper.ExecuteReader(ConnString.connReadonly, CommandType.Text, sql, null))
            {
                while (dr.Read())
                {
                    Model.AdminLeft model = new Model.AdminLeft();
                    object obj;
                    obj = dr["Id"];
                 if (obj != null && obj != DBNull.Value)
                    {
                        model.Id = (int)obj;
                    }
                    obj = dr["pItemId"];
                 if (obj != null && obj != DBNull.Value)
                    {
                        model.pItemId = (int)obj;
                    }                   
                    model.ItemName = dr["ItemName"].ToString();                  
                    list.Add(model);
                }
            }
            return list;
        }