C#获取内网和外网IP

写了个小客户端，里面用到了获取内网和外网的IP地址，代码如下：

            // InnerIP

            var ipHost = Dns.Resolve(Dns.GetHostName());

            var ipaddress = ipHost.AddressList[0];

            innerIP = ipaddress.ToString();   

        /// <summary>

        /// 获得客户端外网IP地址

        /// </summary>

        /// <returns>IP地址</returns>

        private string GetClientInternetIP()

        {

            string ip;

            using (WebClient webClient = new WebClient())

            {

                var content = webClient.DownloadString("http://www.ip138.com/ips1388.asp"); //站获得IP的网页

                //判断IP是否合法

                ip = new Regex(@"\[((\d{1,3}\.){3}\d{1,3})\]").Match(content).Groups[1].Value;

            }

            return ip;

        }