asistencia-desktop/Asistencia/App.axaml.cs

using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using Asistencia.ViewModels;
using Asistencia.Views;
using Asistencia.Data;
using Asistencia.Data.Repositories;
using Asistencia.Services;
using Microsoft.Extensions.DependencyInjection;

namespace Asistencia;

public partial class App : Application
{
    public static IServiceProvider? Services { get; private set; }

    public override void Initialize()
    {
        AvaloniaXamlLoader.Load(this);
    }

    public override void OnFrameworkInitializationCompleted()
    {
        var services = new ServiceCollection();

        services.AddDbContext<AppDbContext>();
        services.AddSingleton<ProfesorRepository>();
        services.AddSingleton<CursoRepository>();
        services.AddSingleton<AsistenciaRepository>();
        services.AddSingleton<AuthService>();
        services.AddSingleton<AsistenciaService>();
        services.AddSingleton<ConnectivityService>();
        services.AddSingleton<MainWindowViewModel>();

        Services = services.BuildServiceProvider();

        using var scope = Services.CreateScope();
        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
        db.Database.EnsureCreated();

        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        {
            var vm = Services.GetRequiredService<MainWindowViewModel>();
            desktop.MainWindow = new MainWindow
            {
                DataContext = vm
            };
        }

        base.OnFrameworkInitializationCompleted();
    }
}