.NET MAUI device MAC address

I am trying to get the MAC address of the current device in .NET MAUI. This is on Android/Windows and iOS.

It looks like NetworkInterfaces is not working as it was.

Consider this code:

public string get_mac()
{
    int c = 0;

    try
    {
        NetworkInterface[] ni = NetworkInterface.GetAllNetworkInterfaces();
        for (c = 0; c < ni.Length; c++)
        {
            if (ni[c].NetworkInterfaceType == NetworkInterfaceType.Ethernet)
            {
                PhysicalAddress pa = ni[c].GetPhysicalAddress();
                return pa.ToString();
            }
        }
        return "!Ethernet Not Found!";
    }
    catch(Exception ex)
    {
        Globals.log.add(ex);
        return "!" + ex.Message;
    }
}

It looks like all of the interfaces are set to a type of "Unknown" and the physical address (MAC) of each is set to "". It looks like it is properly getting the network name.

Is NetworkInterface even valid in .NET MAUI?

My answer is no.

For iOS, the iOS sandbox prevents an app from getting the device's MAC address. You could refer to MAC Address of the iPhone and File system access in Xamarin.iOS.

For Android, now we cannot. You could refer to this issue: How can I get the MAC address from an Android device with OS 11? and the official documentation Don't work with MAC addresses.

For the Windows platform, this code works properly;

string macAddress = (from nic in NetworkInterface.GetAllNetworkInterfaces()
                         where nic.OperationalStatus == OperationalStatus.Up
                         select nic.GetPhysicalAddress().ToString()
                    ).FirstOrDefault();

It's a bit problematic for Android and iOS, as Liqun Shen-MSFT said.