How to register many for open generic in Autofac

Question

I\'m new to Autofac (not to DI). Here is the situation:

I have these interfaces:

public interface IQuery

        

Answer 1

If you have a single concrete generic type, and don't want the scanning overhead and improve the startup performance, you can register as below:

builder.RegisterGeneric(typeof(ConcreteGenericType<>)).As(typeof(IServiceType<>);

Answer 2

You can do this with Autofac you just need to use the scanning feature and use the AsClosedTypesOf method:

AsClosedTypesOf(open) - register types that are assignable to a closed instance of the open generic type.

So your registration will look like this:

builder.RegisterAssemblyTypes(AppDomain.CurrentDomain.GetAssemblies())
       .AsClosedTypesOf(typeof (IQueryHandler<,>)).AsImplementedInterfaces();