首先引入必要的包:

	<ItemGroup><PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.2" /><PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" /><PackageReference Include="Serilog" Version="4.0.0" /><PackageReference Include="Serilog.Extensions.Logging" Version="8.0.0" /><PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" /><PackageReference Include="Serilog.Sinks.File" Version="6.0.0" /></ItemGroup>

将app.xaml 的属性-生成操作改为"页"

此时弹出:

点击"取消"

点击显示所有文件, 将app.xaml包含在项目中

此时, 在csproj中,

  <ItemGroup><ApplicationDefinition Remove="App.xaml" /></ItemGroup><ItemGroup><Page Include="App.xaml" /></ItemGroup>

在app.xaml.cs中 写入

    public partial class App : Application{[STAThread]static  void Main(string[] args){var app = new App();app.InitializeComponent();app.Run();}}

点击运行, 此时项目已经可以运行起来了

在app.xaml中 删除

             StartupUri="MainWindow.xaml"

改为

<Application x:Class="HoistWpfTest.App"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="clr-namespace:HoistWpfTest"><Application.Resources></Application.Resources>
</Application>

        [STAThread]static void Main(string[] args){using var host = CreateHostBuilder(args).Build();host.Start();var app = new App();app.InitializeComponent();app.MainWindow = host.Services.GetRequiredService<MainWindow>();//app.MainWindow.Show();app.MainWindow.Visibility = Visibility.Visible;app.Run();}private static IHostBuilder CreateHostBuilder(string[] args){return Host.CreateDefaultBuilder(args).ConfigureServices(services =>{services.AddSingleton<MainWindow>();});}

此时 已经用Host管理了wpf项目.

较为完整的配置:

using System.Windows;
using CommunityToolkit.Mvvm.Messaging;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Serilog;
using Serilog.Formatting.Json;
using WpfApp6.ViewModels;
using WpfApp6.Views;namespace WpfApp6
{/// <summary>/// Interaction logic for App.xaml/// </summary>public partial class App : Application{[STAThread]static void Main(string[] args){using IHost? host = CreateHostBuilder(args).Build();host.Start();var app = new App();app.InitializeComponent();app.MainWindow = host.Services.GetRequiredService<MainView>();//app.MainWindow.Show();app.MainWindow.Visibility = Visibility.Visible;app.Run();}private static IHostBuilder CreateHostBuilder(string[] args){return Host.CreateDefaultBuilder(args).ConfigureServices(services =>{services.AddSingleton<MainViewModel>();services.AddSingleton(sp => new MainView{DataContext = sp.GetRequiredService<MainViewModel>()});services.AddSingleton<WeakReferenceMessenger>();services.AddSingleton<IMessenger, WeakReferenceMessenger>(sp =>sp.GetRequiredService<WeakReferenceMessenger>());services.AddSingleton(_ => Current.Dispatcher);services.AddHostedService<StartupInitializationService>();}).ConfigureLogging(logging =>{logging.ClearProviders();Log.Logger  = new LoggerConfiguration().MinimumLevel.Debug().Enrich.FromLogContext().WriteTo.Console(new JsonFormatter()).WriteTo.File("log.txt",rollingInterval:RollingInterval.Day).CreateLogger();logging.AddSerilog(Log.Logger);});}}
}

    public class StartupInitializationService : IHostedLifecycleService{private readonly ILogger<StartupInitializationService> logger;public StartupInitializationService(ILogger<StartupInitializationService> logger){this.logger = logger;}public Task StartAsync(CancellationToken cancellationToken){return Task.CompletedTask;}public Task StartedAsync(CancellationToken cancellationToken){Task.Run(async () =>{while (true){logger.LogWarning($"输出日志:{DateTime.Now}");await Task.Delay(1000);}});return Task.CompletedTask;}public Task StartingAsync(CancellationToken cancellationToken){return Task.CompletedTask;}public Task StopAsync(CancellationToken cancellationToken){return Task.CompletedTask;}public Task StoppedAsync(CancellationToken cancellationToken){return Task.CompletedTask;}public Task StoppingAsync(CancellationToken cancellationToken){return Task.CompletedTask;}}