AMessanger-Avalonia-Client/AMessanger/Program.cs

using Microsoft.Extensions.DependencyInjection;
using Avalonia;
using System;
using AMessanger.ViewModels;
using AMessanger.Services;
using System.IO;
using System.Linq;

namespace AMessanger;

sealed class Program
{
    public static IServiceProvider Services { get; private set; } = null!;

    // Initialization code. Don't use any Avalonia, third-party APIs or any
    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
    // yet and stuff might break.
    [STAThread]
    public static void Main(string[] args)
    {
        var services = new ServiceCollection();

        services.AddSingleton(p =>
        {
            var url = File
                .ReadAllLines("ConnectionUrl")
                .First(l => !string.IsNullOrWhiteSpace(l)
                    && !l.TrimStart().StartsWith('#'));
            
            var chat = new ChatService(url);
            chat.ConnectAsync();

            return chat;
        });

        // ViewModels
        services.AddTransient<MainViewModel>();

        Services = services.BuildServiceProvider();

        BuildAvaloniaApp()
            .StartWithClassicDesktopLifetime(args);
    }

    // Avalonia configuration, don't remove; also used by visual designer.
    public static AppBuilder BuildAvaloniaApp()
        => AppBuilder.Configure<App>()
            .UsePlatformDetect()
#if DEBUG
            .WithDeveloperTools()
#endif
            .WithInterFont()
            .LogToTrace();
}