dwz 关于查找带回，带下拉级联的问题

是一个关于查找带回，带级联的问题，下拉列表为何没有值呢？

asp代码：

客户姓名：

postField="keyword" suggestFields="userList.danhao,userList.xingming" class="required"
suggestUrl="/Module/BaoxiuGuanli/ShouHouChaZhaoDaiHui.aspx" lookupGroup="userList"/>
lookupgroup="userList">查找带回 href="#">清除选择

后台代码：
StringBuilder userList = new StringBuilder();
userList.Append("[");
int row = 0;

        foreach (tbaoxiuguanliData areaData in userList1)
        {
            row++;
            userList.Append("{\"" + "id" + "\"" + ":" + "\"" + row + "\"" + "," + "\"" + "danhao" + "\"" + ":" + "\"" +
                    areaData.Danhao + "\""+","+ "\"" + "xingming"+"\""+":"+"\""+areaData.xingming + "\"},");

        }
        //System.Web.HttpContext.Current.Response.Write(userList);
        //Response.End();

        userList.Remove(userList.ToString().LastIndexOf(','), 1);
        userList.Append("]");
        userList.ToJson();

拼出来的值肯定是对的，用断点跟过的，结构如下：

[
{"id":"1","danhao":"01133","xingming":"wang"},
{"id":"2","danhao":"01131","xingming":"wang1"},
{"id":"3","danhao":"01132","xingming":"wang2"},
{"id":"4","danhao":"01129","xingming":"李xiao英"}
]

为什么就是显示不出来呢？？明明有值啊！！！