c# 取得ip地址和网关

 /// <summary>

        /// 得到本机IP

        /// </summary>

        private string GetLocalIP() 

        {

            //本机IP地址

            string strLocalIP = "";

            //得到计算机名

            string strPcName = Dns.GetHostName();

            //得到本机IP地址数组

            IPHostEntry ipEntry = Dns.GetHostEntry(strPcName);

            //遍历数组

            foreach(var IPadd in ipEntry.AddressList)

            {

                //判断当前字符串是否为正确IP地址

                if (IsRightIP(IPadd.ToString())) 

                {

                    //得到本地IP地址

                    strLocalIP = IPadd.ToString();

                    //结束循环

                    break;

                }

            }

            //返回本地IP地址

            return strLocalIP;

        }

        //得到网关地址

        private string GetGateway() 

        { 

            //网关地址

            string strGateway = "";

            //获取所有网卡

            NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();

            //遍历数组

            foreach (var netWork in nics)

            {

                //单个网卡的IP对象

                IPInterfaceProperties ip = netWork.GetIPProperties();

                //获取该IP对象的网关

                GatewayIPAddressInformationCollection gateways = ip.GatewayAddresses;

                foreach(var gateWay in gateways)

                {

                    //如果能够Ping通网关

                    if(IsPingIP(gateWay.Address.ToString()))

                    {

                        //得到网关地址

                        strGateway = gateWay.Address.ToString();

                        //跳出循环

                        break;

                    }

                }

                //如果已经得到网关地址

                if (strGateway.Length > 0) 

                {

                    //跳出循环

                    break;

                }

            }

            //返回网关地址

            return strGateway;

        }

        /// <summary>

        /// 判断是否为正确的IP地址

        /// </summary>

        /// <param name="strIPadd">需要判断的字符串</param>

        /// <returns>true = 是 false = 否</returns>

        public static bool IsRightIP(string strIPadd) 

        {

            //利用正则表达式判断字符串是否符合IPv4格式

            if (Regex.IsMatch(strIPadd, "[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}"))

            {

                //根据小数点分拆字符串

                string[] ips = strIPadd.Split('.');

                if (ips.Length == 4 || ips.Length == 6)

                {

                    //如果符合IPv4规则

                    if (System.Int32.Parse(ips[0]) < 256 && System.Int32.Parse(ips[1]) < 256 & System.Int32.Parse(ips[2]) < 256 & System.Int32.Parse(ips[3]) < 256)

                        //正确

                        return true;

                    //如果不符合

                    else

                        //错误

                        return false;

                }

                else

                    //错误

                    return false;

            }

            else

                //错误

                return false;

        }

        /// <summary>

        /// 尝试Ping指定IP是否能够Ping通

        /// </summary>

        /// <param name="strIP">指定IP</param>

        /// <returns>true 是 false 否</returns>

        public static bool IsPingIP(string strIP) 

        {

            try

            {

                //创建Ping对象

                Ping ping = new Ping();

                //接受Ping返回值

                PingReply reply = ping.Send(strIP, 1000);

                //Ping通

                return true;

            }

            catch 

            {

                //Ping失败

                return false;

            }

        }