TreeGrid分页树形表格

[{
    "id":1,
    "name":"C",
    "size":"",
    "date":"02/19/2010",
    "children":[{
        "id":2,
        "name":"Program Files",
        "size":"120 MB",
        "date":"03/20/2010",
        "children":[{
            "id":21,
            "name":"Java",
            "size":"",
            "date":"01/13/2010",
            "state":"closed",
            "children":[{
                "id":211,
                "name":"java.exe",
                "size":"142 KB",
                "date":"01/13/2010"
            },{
                "id":212,
                "name":"jawt.dll",
                "size":"5 KB",
                "date":"01/13/2010"
            }]
        },{
            "id":22,
            "name":"MySQL",
            "size":"",
            "date":"01/13/2010",
            "state":"closed",
            "children":[{
                "id":221,
                "name":"my.ini",
                "size":"10 KB",
                "date":"02/26/2009"
            },{
                "id":222,
                "name":"my-huge.ini",
                "size":"5 KB",
                "date":"02/26/2009"
            },{
                "id":223,
                "name":"my-large.ini",
                "size":"5 KB",
                "date":"02/26/2009"
            }]
        }]
    },{
        "id":3,
        "name":"eclipse",
        "size":"",
        "date":"01/20/2010",
        "children":[{
            "id":31,
            "name":"eclipse.exe",
            "size":"56 KB",
            "date":"05/19/2009"
        },{
            "id":32,
            "name":"eclipse.ini",
            "size":"1 KB",
            "date":"04/20/2010"
        },{
            "id":33,
            "name":"notice.html",
            "size":"7 KB",
            "date":"03/17/2005"
        }]
    }] 

DAL.cs
/// <summary>
        /// 分页查询
        /// </summary>
        /// <param name="pageNumber"></param>
        /// <param name="pageSize"></param>
        /// <returns></returns>
        public DataSet GetMenuListByPage(int pageNumber, int pageSize)
        {
            StringBuilder strSql = new StringBuilder();

            strSql.Append(@"SELECT pageitem ,menuId AS id ,menuParId AS _parentId ,menuName ,menuCode ,menuUrl ,menuIcon AS iconCls ,updateBy ,sortId FROM ( SELECT ROW_NUMBER() OVER (ORDER BY sortId ASC) AS pageitem ,menuId ,menuParId ,menuName ,menuCode ,menuUrl ,menuIcon ,updateBy ,sortId FROM dbo.tb_menu  ");

            strSql.Append(@" ) a WHERE pageitem > " + pageSize * (pageNumber - 1) + "  AND   pageitem <= " + pageSize * (pageNumber) + "   ");

            strSql.Append(@"  SELECT COUNT(1) AS  itemcount  FROM  dbo.tb_menu   ");

            return DbHelperSQL.Query(strSql.ToString());
        }


BAL.cs
public List<Model_tb_menu> GetMenuListByPage(int pageNumber, int pageSize, out int itemcount)
        {
            DataSet ds = this.dal.GetMenuListByPage(pageNumber, pageSize);
            itemcount = 0;
            if (ds != null && ds.Tables.Count > 1 && ds.Tables[0].Rows.Count > 0 && ds.Tables[1].Rows.Count > 0)
            {
                itemcount = int.Parse(ds.Tables[1].Rows[0][0].ToString());
            }

            return ModelHandler<Model_tb_menu>.FillModel(ds.Tables[0]);
        }


MenuHandler.cs
private void LoadMenuDataByPage(HttpContext context)
        {
            int pageNumber = Request.GetFormInt("page", 1);
            int pageSize = Request.GetFormInt("rows", 15);
            int itemcount = 0;
            List<Model_tb_menu> list = new BLL_Menu().GetMenuListByPage(pageNumber, pageSize, out itemcount);

            var jobj = new JObject();
            jobj["total"] = itemcount;
            jobj["rows"] = (JArray)JToken.FromObject(list);

            Response.WriteJson(context, jobj.ToString());
        }