在aspnetcore的startup中如果无法访问autowired

[qinqoushui]

你好，service等，非controller，autowired无法被正确赋值，始终 为空，应该如何正确使用呢，目前没办法只好在HomeController中注入了一个属性，然后延时一段时间后再使用定时任务的方式来执行业务。

 [Service(NAutowired.Core.Models.Lifetime.Singleton)]
    public class FooService
    {
        IConfiguration _Configuration;
        public FooService(IConfiguration Configuration)
        {
            _Configuration = Configuration;
        }

        [Autowired]
        TcpServer tcpServer2 { get; set; }

        public async void Start()
        {
            await tcpServer2.Create(new Coldairarrow.DotNettySocket.BuildOption() { Port = int.Parse(_Configuration.GetSection("TCP:Port").Value) });
        }
    }

• Startup.cs

  public void ConfigureServices(IServiceCollection services)
      {
          services.AddControllersWithViews().AddControllersAsServices();
          services.Replace(ServiceDescriptor.Transient<IControllerActivator, NAutowiredControllerActivator>());
          services.AutoRegisterDependency(new List<string> { "Q.DataServer", "Q.TCP", "Q.Wigend" });
  
      }
  public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IServiceProvider serviceProvider)
      {
  ...
  //延时启动，等待HomeController实例化，可正常工作
          //  Task.Delay(60000).ContinueWith(t =>
          //{
          //    var tcpServer = app.ApplicationServices.GetRequiredService<FooService>();
          //    tcpServer.Start(serviceProvider, Configuration);
          //    Console.WriteLine("start tcpserver");
          //});
  
          //启动服务（不能正常工作，立即取得的服务中的属性未注入）
          var fooService = app.ApplicationServices.GetRequiredService<FooService>();
          var appLifetime = app.ApplicationServices.GetRequiredService<Microsoft.Extensions.Hosting.IHostApplicationLifetime>();
  
          appLifetime.ApplicationStarted.Register(() =>
        {
            fooService.Start();
        });
          appLifetime.ApplicationStopped.Register(() =>
          {
              // tcpServer.StopAsync();  //网站停止完成执行
  
          });

• HomeController.cs

  public class HomeController : Controller
  {
      private readonly ILogger<HomeController> _logger;
  
      public HomeController(ILogger<HomeController> logger)
      {
          _logger = logger;
      }
  
      [NAutowired.Core.Attributes.Autowired]
      FooService fooService;
  
  ...      
  }

[qinqoushui]

已解决 //启动服务 TcpServer tcpServer; using (var scope = serviceProvider.CreateScope()) { tcpServer = scope.ServiceProvider.GetRequiredService(); DependencyInjection.Resolve(serviceProvider, tcpServer); } var appLifetime = app.ApplicationServices.GetRequiredService(); appLifetime.ApplicationStarted.Register(async () => { await tcpServer.Create(new Coldairarrow.DotNettySocket.BuildOption() { Port = int.Parse(Configuration.GetSection("TCP:Port").Value) }); });

[FatTigerWang]

由于Autowired属性的还原是在请求进来创建控制器对象时通过钩子来进行还原的，因此在Startup.cs中，是直接通过ASP.NET Core容器直接进行还原，而这时钩子无法正常工作，因此此处无法还原。这种情况下建议使用原生的构造函数注入依赖。

[FatTigerWang]

如果是Console程序，请看NET Core Console

[qinqoushui]

Console的没有问题。构造注入也是种办法。目前问题已经解决，谢谢。

[qinqoushui]

构造函数注入的示例（此方法对于TcpServer 内部依赖的其它属性注入无效。）

public class FooService
    {
        IConfiguration _Configuration;
        TcpServer _tcpServer;
        public FooService(IConfiguration Configuration, TcpServer tcpServer)
        {
            _Configuration = Configuration;
            _tcpServer = tcpServer;

        }

        public async void Start()
        {
            await _tcpServer.Create(new Coldairarrow.DotNettySocket.BuildOption() { Port = int.Parse(_Configuration.GetSection("TCP:Port").Value) });
        }
    }

• startup.cs

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IServiceProvider serviceProvider)
        {
...
//启动服务
            var appLifetime = app.ApplicationServices.GetRequiredService<Microsoft.Extensions.Hosting.IHostApplicationLifetime>();
            //使用service进行构造注入的方式处理
            FooService fooService;
            using (var scope = serviceProvider.CreateScope())
            {
                fooService = scope.ServiceProvider.GetRequiredService<FooService>();
            }
            appLifetime.ApplicationStarted.Register(() =>
          {
              fooService.Start();
          });