atomui/samples/AtomUI.Demo.Desktop/App.axaml.cs

using AtomUI.Demo.Desktop.Views;
using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;

namespace AtomUI.Demo.Desktop;

public class App : Application
{
    public override void Initialize()
    {
        AvaloniaXamlLoader.Load(this);
    }

    public override void OnFrameworkInitializationCompleted()
    {
        switch (ApplicationLifetime)
        {
            case IClassicDesktopStyleApplicationLifetime desktop:
                desktop.MainWindow = new MainWindow();
                break;
            case ISingleViewApplicationLifetime singleView:
                singleView.MainView = new MainView();
                break;
        }

        base.OnFrameworkInitializationCompleted();
    }
}