将 Autofac 与 ASP.Net Core 3.1 通用主机“Worker Service”应用程序一起使用

Question

在 ASP.Net Core 应用程序中，使用以下命令可以轻松配置 Autofac：

public class Program
{
  public static void Main(string[] args)
  {
    // ASP.NET Core 3.0+:
    // The UseServiceProviderFactory call attaches the
    // Autofac provider to the generic hosting mechanism.
    var host = Host.CreateDefaultBuilder(args)
        .UseServiceProviderFactory(new AutofacServiceProviderFactory())
        .ConfigureWebHostDefaults(webHostBuilder => {
          webHostBuilder
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseStartup<Startup>();
        })
        .Build();

    host.Run();
  }
}

public class Startup
{
  // Omitting extra stuff so you can see the important part...
  public void ConfigureServices(IServiceCollection services)
  {
    // Add controllers as services so they'll be resolved.
    services.AddMvc().AddControllersAsServices();
  }

  public void ConfigureContainer(ContainerBuilder builder)
  {
    // If you want to set up a controller for, say, property injection
    // you can override the controller registration after populating services.
    builder.RegisterType<MyController>().PropertiesAutowired();
  }
}

但是在通用主机中，Worker 类没有任何内置支持ConfigureServices和ConfigureContainer。

如何在非 ASP.Net Core 应用程序中为通用主机启用相同的功能？

Answer 1

在通用主机制造商也有内置的支持ConfigureContainer和ConfigureServices

var host = Host.CreateDefaultBuilder(args)
    .UseServiceProviderFactory(new AutofacServiceProviderFactory())
    .ConfigureContainer<ContainerBuilder>(builder => {

        builder.RegisterType<MyDependencyType>();

        //...
    })
    .ConfigureServices(services => {

        services.AddHostedService<Worker>();

        //...
    })
    .ConfigureWebHostDefaults(webHostBuilder => {
        webHostBuilder
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseStartup<Startup>();
    })
    .Build();

host.Run();

参考.NET 通用主机