FileTranslation/App.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Data.Core.Plugins;
using Avalonia.Markup.Xaml;
using FileTranslation.Core;
using FileTranslation.Scripts;
using FileTranslation.Services;
using FileTranslation.ViewModels;
using FileTranslation.Views;

namespace FileTranslation;

public partial class App : Application
{
    public override void Initialize()
    {
        AvaloniaXamlLoader.Load(this);
        
        if (!this.Resources.MergedDictionaries.TryGetValue(AppResources.Global, out var globalDic) || globalDic is not IResourceDictionary globalResourceDictionary)
        {
            throw new NullReferenceException(nameof(globalResourceDictionary));
        }

        AppResources.GlobalResources = globalResourceDictionary;
        if (!this.Resources.MergedDictionaries.TryGetValue(AppResources.Icons, out var iconDic) || iconDic is not IResourceDictionary iconResourceDictionary)
        {
            throw new NullReferenceException(nameof(iconResourceDictionary));
        }

        AppResources.IconResources = iconResourceDictionary;
        if (!this.Resources.MergedDictionaries.TryGetValue(AppResources.Convertors, out var convertorDic) || convertorDic is not IResourceDictionary convertersResourceDictionary)
        {
            throw new NullReferenceException(nameof(convertersResourceDictionary));
        }

        AppResources.ConvertorResources = convertersResourceDictionary;       
        if (!this.Resources.MergedDictionaries.TryGetValue(AppResources.GlobalTemplates, out var globalStylesDic) || globalStylesDic is not IResourceDictionary globalStylesResourceDictionary)
        {
            throw new NullReferenceException(nameof(globalStylesResourceDictionary));
        }

        AppResources.GlobalTemplatesResources = globalStylesResourceDictionary;
    }

    public override void OnFrameworkInitializationCompleted()
    {
        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        {
            // Line below is needed to remove Avalonia data validation.
            // Without this line you will get duplicate validations from both Avalonia and CT
            BindingPlugins.DataValidators.RemoveAt(0);
            IServices services = new Services.Services();
            Global.services = services;
            IMainService mainService = new MainService();
            ISettingService settingService = new SettingService();
            INetService netService = new NetService(services);
            services.AddSingleton(mainService);
            services.AddSingleton(settingService);
            services.AddSingleton(netService);
            services.AddSingleton((IDispatcherService)new DispatcherService());
            settingService.Load();
            desktop.MainWindow = new MainWindowView
            {
                DataContext = new MainWindowViewModel(services),
            };
        }

        base.OnFrameworkInitializationCompleted();
    }
    
}

public class Global
{
    public static IServices services { get; set; }
}