///
        /// 通过NetworkInterface读取网卡Mac        ///
        ///
             public static string GetMacByNetworkInterface()        {            List
     
       macs = new List
      
       ();            NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();            return interfaces.Where(p => p.OperationalStatus == OperationalStatus.Up).FirstOrDefault().GetPhysicalAddress().ToString();        }