效果：
说明：获取本局域网的MAC地址（非本机的MAC地址）
代码：
代码如下:
///
/// 获取网卡物理地址
///
///
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;
}