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第一步 得学会 在aspnetcore 项目如何快速使用autofac

请参考官方教程(里面详细区分了ASP.NET Core 1.1 - 2.2 和 ASP.NET Core 3+ 的使用方式)：

https://autofaccn.readthedocs.io/en/latest/integration/aspnetcore.html?highlight=aspnetcore

第二步 启动打标签模式

按照第一步搞定后

miniapi 如何启用

var builder = WebApplication.CreateBuilder(args);

// 设置使用autofac作为DI容器
builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory());

// 设置DI容器 添加注解功能
builder.Host.ConfigureContainer<ContainerBuilder>((c, containerBuilder) =>
{
    // 在这里 在这里 在这里
    containerBuilder.RegisterModule(new AutofacAnnotationModule());
});

// 如果希望设置Controller实例的生成也交给autofac
// builder.Host.ConfigureServices(services => { services.Replace(ServiceDescriptor.Transient<IControllerActivator, ServiceBasedControllerActivator>()); 
// 如果希望PageModel的实例的生成也交给autofac
// builder.Host.ConfigureServices(services => { services.Replace(ServiceDescriptor.Transient<IPageModelActivatorProvider, ServiceBasedPageModelActivatorProvider>()); });
});

ASP.NET Core 3+ 如何启用

  // ConfigureContainer is where you can register things directly
  // with Autofac. This runs after ConfigureServices so the things
  // here will override registrations made in ConfigureServices.
  // Don't build the container; that gets done for you by the factory.
  public void ConfigureContainer(ContainerBuilder builder)
  {
    // 在这里 在这里 在这里
    builder.RegisterModule(new AutofacAnnotationModule());
  }

ASP.NET Core 1.1 - 2.2 的话 如何启用：

  // ConfigureServices is where you register dependencies and return an `IServiceProvider` implemented by `AutofacServiceProvider`.
  // This is the old, not recommended way, and is NOT SUPPORTED in ASP.NET Core 3.0+.
  public IServiceProvider ConfigureServices(IServiceCollection services)
  {
    // Add services to the collection
    services.AddOptions();

    // Create a container-builder and register dependencies
    var builder = new ContainerBuilder();

    // Populate the service-descriptors added to `IServiceCollection`
    // BEFORE you add things to Autofac so that the Autofac
    // registrations can override stuff in the `IServiceCollection`
    // as needed
    builder.Populate(services);

    // 在这里 在这里 在这里
    builder.RegisterModule(new AutofacAnnotationModule());

    AutofacContainer = builder.Build();

    // this will be used as the service-provider for the application!
    return new AutofacServiceProvider(AutofacContainer);
  }

AutofacAnnotationModule 这个类

有2种构造方法

• 空的构造方法 默认会自动加载你项目里面的所有引用
• 传Assembly(一个或多个)进去，仅仅扫描加载指定的Assembly