C#獲取公網IP

借用搜狐的接口實現獲取公網IP

public string GetIP()
{
     string tempip = "";
     WebRequest request = WebRequest.Create("http://pv.sohu.com/cityjson?ie=utf-8");
     request.Timeout = 10000;
     WebResponse response = request.GetResponse();
     Stream resStream = response.GetResponseStream();
     StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
     string htmlinfo = sr.ReadToEnd();
     Regex r = new Regex("((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]\\d|[1-9])", RegexOptions.None);
     Match mc = r.Match(htmlinfo);
     tempip = mc.Groups[0].Value;
     resStream.Close();
     sr.Close();
     return tempip;
 }