csharp: using using System.Web.Script.Serialization read json

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
//先在项目中添加System.Web.Extensions引用.net 3.5
using System.Web.Script.Serialization;
using System.Collections.Specialized;
using System.Collections.Generic;
using System.Text;
using System.Net;

namespace JSONFromCS
{
    public partial class WebForm3 : System.Web.UI.Page
    {
        /// <summary>
        /// 将json数据反序列化为Dictionary
///http://www.weather.com.cn/static/html/legend.shtml 天气图示
        /// </summary>
        /// <param name="jsonData">json数据</param>
        /// <returns></returns>
        private Dictionary<string, object> JsonToDictionary(string jsonData)
        {
            //实例化JavaScriptSerializer类的新实例
            JavaScriptSerializer jss = new JavaScriptSerializer();
            try
            {
                //将指定的 JSON 字符串转换为 Dictionary<string, object> 类型的对象
                return jss.Deserialize<Dictionary<string, object>>(jsonData);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Page_Load(object sender, EventArgs e)
        {

          string  url = "http://www.weather.com.cn/data/cityinfo/101280601.html";
            WebClient wc = new WebClient();
            wc.Encoding = System.Text.Encoding.UTF8;//定义对象语言
            string json = wc.DownloadString(url);
            //string json = "{\"weatherinfo\":{\"city\":\"深圳\",\"cityid\":\"101280601\",\"temp\":\"32\",\"WD\":\"西南风\",\"WS\":\"4级\",\"SD\":\"68%\",\"WSE\":\"4\",\"time\":\"16:40\",\"isRadar\":\"1\",\"Radar\":\"JC_RADAR_AZ9755_JB\"}}";
            StringBuilder strb = new StringBuilder();
            Dictionary<string, object> dic = JsonToDictionary(json);//将Json数据转成dictionary格式
            Dictionary<string, object> dataSet = (Dictionary<string, object>)dic["weatherinfo"];
            //使用KeyValuePair遍历数据
            foreach (KeyValuePair<string, object> item in dataSet)
            {

                strb.Append(item.Key + ":" + item.Value + "<br/>");//显示到界面             

            }

            Response.Write(strb.ToString());
        }
    }
}