MyAvaloniaDemo/AuroraDesk/App.axaml.cs

using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using AuroraDesk.Infrastructure.Configuration;
using AuroraDesk.Infrastructure.Extensions;
using AuroraDesk.Presentation.Extensions;
using AuroraDesk.Presentation.ViewModels;
using AuroraDesk.Presentation.Views;
using ReactiveUI;
using Splat;
using System;
using System.IO;

namespace AuroraDesk;

public partial class App : Avalonia.Application
{
    private IServiceProvider? _serviceProvider;
    private ILogger<App>? _logger;

    /// <summary>
    /// 无参构造函数，用于 Avalonia 框架初始化
    /// </summary>
    public App()
    {
    }

    public override void Initialize()
    {
        AvaloniaXamlLoader.Load(this);
        
        // 注册自定义 ViewLocator
        Locator.CurrentMutable.RegisterConstant(new Presentation.Views.ViewLocator(), typeof(IViewLocator));
    }

    public override void OnFrameworkInitializationCompleted()
    {
        var host = CreateHostBuilder().Build();
        _serviceProvider = host.Services;
        _logger = _serviceProvider.GetRequiredService<ILogger<App>>();
        
        // 注册 ServiceProvider 到 Splat，以便 ViewLocator 可以使用依赖注入创建 View
        Locator.CurrentMutable.RegisterConstant(_serviceProvider, typeof(IServiceProvider));

        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        {
            var mainWindow = _serviceProvider.GetRequiredService<AuroraDesk.Presentation.Views.MainWindow>();
            desktop.MainWindow = mainWindow;
        }

        base.OnFrameworkInitializationCompleted();
    }

    private IHostBuilder CreateHostBuilder() =>
        Host.CreateDefaultBuilder()
            .ConfigureAppConfiguration((context, config) =>
            {
                config.SetBasePath(Directory.GetCurrentDirectory())
                      .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                      .AddJsonFile($"appsettings.{context.HostingEnvironment.EnvironmentName}.json", optional: true)
                      .AddEnvironmentVariables();
            })
            .ConfigureLogging((context, logging) =>
            {
                logging.ClearProviders();
                logging.AddConfiguration(context.Configuration.GetSection("Logging"));
                logging.AddConsole();
                logging.AddDebug();
            })
            .ConfigureServices((context, services) =>
            {
                services.Configure<AppSettings>(context.Configuration.GetSection("AppSettings"));
                
                // 注册服务
                services.AddBusinessServices();
                services.AddViewModels();
                services.AddNavigationService();
                services.AddReactiveUI();
                
                // 注册 MainWindowViewModel
                services.AddTransient<MainWindowViewModel>(provider =>
                    provider.GetRequiredService<AppViewModel>().MainWindowViewModel);
                
                // 注册 MainWindow
                services.AddTransient<AuroraDesk.Presentation.Views.MainWindow>(provider =>
                {
                    var loggerFactory = provider.GetRequiredService<ILoggerFactory>();
                    var logger = loggerFactory.CreateLogger<AuroraDesk.Presentation.Views.MainWindow>();
                    var viewModel = provider.GetRequiredService<MainWindowViewModel>();
                    return new AuroraDesk.Presentation.Views.MainWindow(viewModel, logger);
                });
            });
}