App.axaml.cs

using System;
using System.IO;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Input;
using Avalonia.Markup.Xaml;
using Blacklight.Util;
using Blacklight.ViewModels;
using Blacklight.Views;
using Lightquark.NET;
using Microsoft.Extensions.DependencyInjection;

namespace Blacklight;

public partial class App : Application
{
    
    public static IServiceProvider? Services { get; set; }
    
    public override void Initialize()
    {
        AvaloniaXamlLoader.Load(this);
    }

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

        services.AddSingleton<MainWindowViewModel>();
        services.AddSingleton<ViewNavigationService>();
        services.AddSingleton<Client>();
        
        services.AddSingleton<ClientViewModel>();
        services.AddSingleton<LoginViewModel>();
        
        var serviceProvider = services.BuildServiceProvider();
        Services = serviceProvider;

        serviceProvider.GetRequiredService<ViewNavigationService>();
        var mainWindowViewModel = serviceProvider.GetRequiredService<MainWindowViewModel>();
        var loginViewModel = serviceProvider.GetRequiredService<LoginViewModel>();
        var client = serviceProvider.GetRequiredService<Client>();
        client.OnLogOut = () =>
        {
            mainWindowViewModel.CurrentViewModel = loginViewModel;
            var path = Path.Join(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "blacklight", "login.json");
            try
            {
                Console.WriteLine("Deleting login.json");
                File.Delete(path);
            }
            catch (Exception ex)
            {
                Console.Error.WriteLine(ex);
            }
        };
        var clientViewModel = serviceProvider.GetRequiredService<ClientViewModel>();
        
        switch (ApplicationLifetime)
        {
            case IClassicDesktopStyleApplicationLifetime desktopLifetime:
            {
                var mainWindow = new MainWindow
                {
                    DataContext = mainWindowViewModel
                };

                mainWindow.Closing += (_, _) =>
                {