pcgs-inv/PcgsInvUi/App.axaml.cs

using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using PcgsInvUi.Services;
using PcgsInvUi.ViewModels;
using PcgsInvUi.Views;

namespace PcgsInvUi;

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

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

            // Allow the application to save the database when it exits.
            desktop.Exit += (sender, args) => { coins.UpdateCollection("CollectionTable"); };
        }

        base.OnFrameworkInitializationCompleted();
    }
}