// 获取IP
 protected string GetIP()   //获取本地IP 
        {
            IPHostEntry ipHost = Dns.Resolve(Dns.GetHostName());
            IPAddress ipAddr = ipHost.AddressList[0];
            return ipAddr.ToString();
        }
        // 获取物理地址
        public static string getMacAddr_Local()
        {
            string madAddr = null;
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc2 = mc.GetInstances();
            foreach (ManagementObject mo in moc2)
            {
                if (Convert.ToBoolean(mo["IPEnabled"]) == true)
                {
                    madAddr = mo["MacAddress"].ToString();
                    madAddr = madAddr.Replace(':', '-');
                }
                mo.Dispose();
            }
            return madAddr;
        }

------解决方案--------------------
            string ip = "127.0.0.1"; //远程IP这里定义为自己的机器
           IPAddress[] ih = Dns.GetHostAddresses(ip);  //获取IP列表
           IPAddress newip = ih[0]; //获取IP地址