C#获取计算机上网的公网ip和地理位置

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//===========获取计算机上网的公网ip:113.57.68.117 protected void Button2_Click(object sender, EventArgs e)        {                                  try            {                //string ip = "";                WebClient MyWebClient = new WebClient();                MyWebClient.Credentials = CredentialCache.DefaultCredentials;//获取或设置用于向Internet资源的请求进行身份验证的网络凭据                Byte[] pageData = MyWebClient.DownloadData("http://www.net.cn/static/customercare/yourip.asp"); //从指定网站下载数据                string pageHtml = Encoding.Default.GetString(pageData);  //如果获取网站页面采用的是GB2312，则使用这句                //string pageHtml = Encoding.UTF8.GetString(pageData); //如果获取网站页面采用的是UTF-8，则使用这句                //string[] str = HtmlHelper.GetElementsByTagName(pageHtml, "h2");                // string[] str1 = str[0].Replace("<h2>", "").Split(',');                //ip = str1[0];                // Response.Write(ip);                string s = GetStr(pageHtml, "<h2>", "</h2>");                Response.Write(s);            }            catch (WebException webEx)            {                webEx.Message.ToString();            }        }        public string GetStr(string Content, string start, string end)        {            var posStart = Content.IndexOf(start);            var posEnd = Content.IndexOf(end);            return Content.Substring(posStart, (posEnd - posStart + end.Length));        }//===========获取ip和地理信息         protected void Button1_Click(object sender, EventArgs e)        {            //获取ip和地理信息            string url = "http://pv.sohu.com/cityjson";            WebRequest wRequest = WebRequest.Create(url);            wRequest.Method = "GET";            wRequest.ContentType = "text/html;charset=UTF-8";            WebResponse wResponse = wRequest.GetResponse();            Stream stream = wResponse.GetResponseStream();            StreamReader reader = new StreamReader(stream, System.Text.Encoding.Default);            string str = reader.ReadToEnd();   //url返回的值              reader.Close();            wResponse.Close();            //var returnCitySN = {"cip": "113.57.68.117", "cid": "420100", "cname": "湖北省武汉市"};           // Response.Write(str);            var start = str.IndexOf('{');            var end = str.IndexOf('}');            str = str.Substring(start, (end - start) + 1);            //{"cip": "113.57.68.117", "cid": "420100", "cname": "湖北省武汉市"}            //Response.Write(str);            //湖北省武汉市            JObject jonObj = JObject.Parse(str);            Response.Write(jonObj["cname"].ToString() + "  " + jonObj["cip"].ToString());        }