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;
            }
        }