presence/Presence.Desktop/App.axaml.cs

using System;
using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using Microsoft.Extensions.DependencyInjection;
using Presence.Desktop.DI;
using Presence.Desktop.ViewModels;
using Presence.Desktop.Views;

namespace Presence.Desktop
{
    public partial class App : Application
    {
        public static IServiceProvider? ServiceProvider { get; private set; }
        public override void Initialize()
        {
            AvaloniaXamlLoader.Load(this);
        }

        public override void OnFrameworkInitializationCompleted()
        {
            var serviceCollection = new ServiceCollection();
            serviceCollection.AddCommonService();
            ServiceProvider = serviceCollection.BuildServiceProvider();

            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
            {
                desktop.MainWindow = new MainWindow()
                {
                    DataContext = new MainWindowViewModel(ServiceProvider),
                };
            }

            base.OnFrameworkInitializationCompleted();
        }
    }
}

// using System;
// using Avalonia.Controls.ApplicationLifetimes;
// using Microsoft.Extensions.DependencyInjection;
// using Presence.Desktop.DI;
// using Presence.Desktop.ViewModels;
// using Presence.Desktop.Views;
// using static System.Net.Mime.MediaTypeNames;

// namespace Presence.Desktop
// {
//     public partial class App : Application
//     {
//         public static IServiceProvider? ServiceProvider { get; private set; }

//         public override void OnFrameworkInitializationCompleted()
//         {
//             var serviceCollection = new ServiceCollection();
//             serviceCollection.AddCommonService(); // Зарегистрируйте свои сервисы
//             ServiceProvider = serviceCollection.BuildServiceProvider();

//             if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
//             {
//                 desktop.MainWindow = new MainWindow
//                 {
//                     DataContext = new MainWindowViewModel(ServiceProvider),
//                 };
//             }

//             base.OnFrameworkInitializationCompleted();
//         }
//     }
// }