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());

        }

    }

}