I'm new to Autofac (not to DI). Here is the situation:
I have these interfaces:
public interface IQuery<out TResult> : IQuery { }
public interface IQueryHandler<in TQuery, out TResult> where TQuery : IQuery<TResult> {
TResult Handle(TQuery query);
}
and there is a lot of implementation of them in my solution:
class GetPersonQuery : IQuery<PersonModel> { }
class GetPersonQueryHandler : IQueryHandler<GetPersonQuery, PersonModel> { }
class GetArticleQuery : IQuery<ArticleModel> { }
class GetArticleQueryHandler : IQueryHandler<GetArticleQuery, ArticleModel> { }
class GetSomethingQuery : IQuery<IEnumerable<SomeModel>> { }
class GetSomethingQueryHandler : IQueryHandler<GetSomethingQuery, IEnumerable<SomeModel>> { }
and so on. I'm currently registering them like this:
builder.RegisterType<GetPersonQueryHandler>()
.As<IQueryHandler<GetPersonQuery, PersonModel>>();
builder.RegisterType<GetArticleQueryHandler>()
.As<IQueryHandler<GetArticleQuery, ArticleModel>>();
builder.RegisterType<GetSomethingQueryHandler>()
.As<IQueryHandler<GetSomethingQuery, SomeModel>>();
// blah blah blah
As you can see, I have a many same registrations. In SimpleInjector
(which I was using before), I could register all of them by a single line:
container.RegisterManyForOpenGeneric(
typeof(IQueryHandler<,>),
AppDomain.CurrentDomain.GetAssemblies());
Is it possible to do this stuff in Autofac?
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();