關于Autofac中的AsSelf()具體有什么用，有點好奇查了文檔了解了下

Services vs. Components

When you register?components, you have to tell Autofac which?services?that component exposes. By default, most registrations will just expose themselves as the type registered:

// This exposes the service "CallLogger" builder.RegisterType<CallLogger>();

Components can only be?resolved?by the services they expose. In this simple example it means:

// This will work because the component // exposes the type by default: scope.Resolve<CallLogger>();// This will NOT work because we didn't // tell the registration to also expose // the ILogger interface on CallLogger: scope.Resolve<ILogger>();

You can expose a component with any number of services you like:

builder.RegisterType<CallLogger>().As<ILogger>().As<ICallInterceptor>();

Once you expose a service, you can resolve the component based on that service. Note, however, that once you expose a component as a specific service, the default service (the component type) is overridden:

// These will both work because we exposed // the appropriate services in the registration: scope.Resolve<ILogger>(); scope.Resolve<ICallInterceptor>();// This WON'T WORK anymore because we specified // service overrides on the component: scope.Resolve<CallLogger>();

If you want to expose a component as a set of services as well as using the default service, use the?AsSelf?method:

builder.RegisterType<CallLogger>().AsSelf().As<ILogger>().As<ICallInterceptor>();

Now all of these will work:

// These will all work because we exposed // the appropriate services in the registration: scope.Resolve<ILogger>(); scope.Resolve<ICallInterceptor>(); scope.Resolve<CallLogger>();

一個是一個接口有多個實現，AsSelf()的話就是設置為默認的實現了。

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