如何在wpf中通过Microsoft.Extensions.Hosting执行依赖注入

public partial class App : Application
{
    private IHost _host;

    protected override void OnStartup(StartupEventArgs e)
    {
        _host = Host.CreateDefaultBuilder()
            .ConfigureServices((hostContext, services) =>
            {
                // 在这里进行依赖注入的配置
                services.AddSingleton<IMyService, MyService>();
            })
            .Build();

        _host.Start();

        // 创建主窗口并显示
        MainWindow mainWindow = _host.Services.GetRequiredService<MainWindow>();
        mainWindow.Show();
    }

    protected override void OnExit(ExitEventArgs e)
    {
        _host.StopAsync().Wait();
        _host.Dispose();

        base.OnExit(e);
    }
}

public partial class MainWindow : Window
{
    private readonly IMyService _myService;

    public MainWindow(IMyService myService)
    {
        InitializeComponent();

        _myService = myService;
    }
}