/// <summary>         /// 获取网卡物理地址         /// </summary>         /// <returns></returns>         public static string getMAC()         {             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;         }