简单编码解码学习

 //淘宝IP地址库http://ip.taobao.com/accurancy.php
            string url = "http://ip.taobao.com/service/getIpInfo.php?ip=122.224.94.210";
            string responseText = "";
            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url);
            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.Stream responseStream = response.GetResponseStream();
            System.IO.StreamReader str = new System.IO.StreamReader(responseStream, System.Text.Encoding.GetEncoding("GBK"));
            responseText = str.ReadToEnd();
            str.Close();
            str.Dispose();
            responseStream.Close();
            Console.WriteLine(responseText);


            string value = "u676du5ddeu5e02";
            Console.WriteLine(Uri.UnescapeDataString(value));//输出：杭州市