pomodoro/App.axaml.cs

using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using pomodoro.ViewModels;
using pomodoro.Views;

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

  public override void OnFrameworkInitializationCompleted() {
    if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime
            desktop) {
      desktop.MainWindow = new MainWindow {
        DataContext = new MainWindowViewModel(),
      };
    }

    base.OnFrameworkInitializationCompleted();
  }
}
}