C # Gets the native IP of the extranet

 /// <summary>        ///function: Get the local extranet IP address///Yellow Sea///Time: 2016-07-22/// </summary>        /// <returns></returns>        Private Static stringGetpublicip () {varUrllist =Newlist<string>            {                "http://ip.qq.com/",                "Http://pv.sohu.com/cityjson?ie=utf-8",                "Http://ip.taobao.com/service/getIpInfo2.php?ip=myip"            }; varTempip =""; foreach(varAinchurllist) {                Try                {                    varreq =WebRequest.Create (a); Req. Timeout=20000; varResponse =req.                    GetResponse (); varResstream =Response.                    GetResponseStream (); if(Resstream! =NULL)                    {                        varSR =NewStreamReader (Resstream, Encoding.UTF8); varHtmlinfo =Sr.                        ReadToEnd (); //Regular expressions that match an IP                        varR =NewRegex ("((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); varMC =R.match (Htmlinfo); //get the IP that matches toTempip = MC. groups[0].                        Value;                        Resstream.close (); Sr.                        Close (); Response.                    Dispose (); }                    returnTempip; }                Catch(Exception Err) {Console.WriteLine ("current probe URL:"+a+", error description:"+Err.                ToString ()); }            }            returnTempip; }

C # Gets the native IP of the extranet