无法覆盖应用程序 class 中的 onBackgroundActivated 和 OnSuspending 事件：Winui3

Question

I am creating a winui3 application and having the latest .net SDK 5.0403 but I'm unable to override onBackgroundActivated , OnSuspending events in the App class that extends the Application class. I have windows 10(version 19042), Windows.Foundation.UniversalApiContract (v4.0)

Answer 1

The OnLaunched method is already overridden in the App.xaml.cs file that's included in the default WinUI 3 template in Visual Studio.

And Suspending is an event that cannot be overriden but handled in the same class/file:

public partial class App : Application
{
    public App()
    {
        this.InitializeComponent();
        Suspending += OnSuspending;
    }


    protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
    {
        m_window = new MainWindow();
        m_window.Activate();
    }

    private void OnSuspending(object sender, SuspendingEventArgs e)
    {
        //...
    }

    private Window m_window;
}