内网

 IPAddress ipAddr = Dns.Resolve(Dns.GetHostName()).AddressList[];//获得当前IP地址

            string ip = ipAddr.ToString();

 //获取本机的公网IP

        public static string GetPublicNetworkIP()

        {

            string tempip = "";

            WebRequest request = WebRequest.Create("http://ip.qq.com");

            request.Timeout = ;

            WebResponse response = request.GetResponse();

            Stream resStream = response.GetResponseStream();

            StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);

            string htmlinfo = sr.ReadToEnd();

            //匹配IP的正则表达式

            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);

            //获取匹配到的IP

            tempip = mc.Groups[].Value;

            resStream.Close();

            sr.Close();

            return tempip;

        }