Using a fingerprint in an app .Net Maui

Question

Hi all.

I want to use fingerprint in my application (Plugin.Fingerprint by Sven-Michael Stübe).

I found several use cases:

https://cedricgabrang.medium.com/biometric-authentication-in-your-net-maui-application-dc35ec0c1f92

https://www.andreasnesheim.no/how-to-use-biometric-authentication-in-net-maui/

But I want the biometric verification to be carried out not on pressing the button, but when the application starts, after the splash screen.

Answer 1

Hi ,

Here I suggest a snippet that could solve your problem:

using Plugin.Fingerprint;
using Plugin.Fingerprint.Abstractions;
using Xamarin.Forms;

public partial class App : Application
{
    public App()
    {
        InitializeComponent();
    }

    protected override async void OnStart()
    {
        await Task.Delay(2000);

        var isBiometricAvailable = await CrossFingerprint.Current.IsAvailableAsync();

        if (isBiometricAvailable)
        {
            var authResult = await CrossFingerprint.Current.AuthenticateAsync("Biometric authentication required");

            if (authResult.Authenticated)
            {
                MainPage = new MainPage();
            }
            else
            {
                MainPage = new OtherAuthenticationPage();
            }
        }
        else
        {
            MainPage = new OtherAuthenticationPage();
        }
    }
}

Regards,