Autofac 程序集扫描 - .NET Core

Question

我一直在尝试让程序集扫描在我的 .NET core 2.0 项目中工作。

我遇到的异常

Autofac.Core.Registration.ComponentNotRegisteredException
  HResult=0x80131500
  Message=The requested service 'Microsoft.AspNetCore.Hosting.Internal.WebHostOptions' has not been registered. To avoid this exception, either register a component to provide the service, check for service registration using IsRegistered(), or use the ResolveOptional() method to resolve an optional dependency.
  Source=Autofac
  StackTrace:
   at Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable`1 parameters)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
   at Microsoft.AspNetCore.Hosting.WebHostExtensions.<RunAsync>d__4.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host)
   at Track4Corp.VehicleDatabase.Server.Program.Main(String[] args) in C:\Users\Admin\source\repos\VehicleDatabase-server\src\Track4Corp.VehicleDatabase.Server\Program.cs:line 10

程序.cs

using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;

namespace Track4Corp.VehicleDatabase.Server
{
  public class Program
  {
    public static void Main(string[] args)
    {
      CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>();
  }
}

启动类

public class Startup
  {
    public Autofac.IContainer ApplicationContainer { get; private set; }

    public IConfigurationRoot Configuration { get; private set; }

    public IServiceProvider ConfigureServices(IServiceCollection services)
    {
//TODO: Move out of code before release
      services.AddDbContext<UserDBContext>(options => options.UseSqlServer("Server=DESKTOP-9L9IGFE;Database=DB;Trusted_Connection=True;"));

      //Autofac Assembly Registration
      ApplicationContainer = AutoFacAssemblyRegistration.RegisterAllAssemblies();

      return new AutofacServiceProvider(ApplicationContainer);
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
      if (env.IsDevelopment())
      {
        app.UseDeveloperExceptionPage();
      }

      app.Run(async (context) =>
      {
       await context.Response.WriteAsync("Hello World!");
      });

所以我的实际构建器我转移到另一个项目，我现在在我知道所有 dll 文件所在的硬编码路径上扫描。我在调试模式下运行它并看到它们都在那里。

  public class AutoFacAssemblyRegistration
  {
    public static IContainer RegisterAllAssemblies()
    {
      var builder = new ContainerBuilder();
      string executingDirectory = Directory.GetCurrentDirectory();
      // string[] files = Directory.GetFiles(executingDirectory, "*.dll");
      string[] files = Directory.GetFiles(@"PATH_HERE", "*.dll");

      var listOfAssemblies = new List<Assembly>();
      foreach (string item in files)
      {
        listOfAssemblies.Add(item: Assembly.LoadFile(item));
      }
      builder.RegisterAssemblyTypes(listOfAssemblies.ToArray()).AsImplementedInterfaces().InstancePerLifetimeScope();
      //builder.RegisterAssemblyModules(listOfAssemblies.ToArray());

      return builder.Build();
    }
  }

我还尝试了不同类型的解决方案来注册程序集，例如

foreach (Assembly item in listOfAssemblies)
{
  System.Type[] assemblyType = item.GetTypes();
  foreach (System.Type typeItem in assemblyType)
  {
    if (typeItem.IsInterface)
    {
      Autofac.Builder.IRegistrationBuilder<object, Autofac.Builder.ConcreteReflectionActivatorData,
        Autofac.Builder.SingleRegistrationStyle> registration =
        builder.RegisterType(typeItem).AsImplementedInterfaces();

      if (typeItem.GetInterfaces().Any(i => i.IsAssignableFrom(typeof(ISingletonDependency))))
      {
        registration.SingleInstance();
      }
      else
      {
        registration.InstancePerRequest();
      }
    }
  }
}

我想知道我是否做错了什么，或者这在 .NET core 2.1 项目中是不可能的？

如果有人能提示我正确的方向，如何解决我的问题，那就太好了。

Answer 1

有一个类似的问题并通过在添加containerBuilder.Populate(serviceCollection) 之前添加containerBuilder.Build() 来解决它。

按照您在问题中提供的示例，它看起来像这样 -

  public class AutoFacAssemblyRegistration
  {
    public static IContainer RegisterAllAssemblies(IServiceCollection services)
    {
      var builder = new ContainerBuilder();
      builder.Populate(services);
      string executingDirectory = Directory.GetCurrentDirectory();
      // string[] files = Directory.GetFiles(executingDirectory, "*.dll");
      string[] files = Directory.GetFiles(@"PATH_HERE", "*.dll");

      var listOfAssemblies = new List<Assembly>();
      foreach (string item in files)
      {
        listOfAssemblies.Add(item: Assembly.LoadFile(item));
      }
      builder.RegisterAssemblyTypes(listOfAssemblies.ToArray()).AsImplementedInterfaces().InstancePerLifetimeScope();
      //builder.RegisterAssemblyModules(listOfAssemblies.ToArray());

      return builder.Build();
    }
  }