winform定制一个代码段 输出运行设备的mac码此方法获取的是运行设备上的物理网卡的MAC地址，并不包括虚拟网卡或无线网卡的MAC地址。当设备具有多个网卡时，它只返回第一个正常运行的网卡的MAC地址。如果未找到任何网卡，则返回"未找到MAC地址"。windows

  private static string GetMacAddress(){NetworkInterface[] networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();foreach (NetworkInterface networkInterface in networkInterfaces){// 排除虚拟网卡和无效网卡if (networkInterface.NetworkInterfaceType == NetworkInterfaceType.Loopback || networkInterface.OperationalStatus != OperationalStatus.Up)continue;PhysicalAddress physicalAddress = networkInterface.GetPhysicalAddress();byte[] bytes = physicalAddress.GetAddressBytes();string macAddress = BitConverter.ToString(bytes);return macAddress;}return "未找到MAC地址";}