Registering a different generic type as scanned

Question

I try to register a generic type Repository<T> with the interface IRepository<T> where T is IEntity .

builder.RegisterAssemblyTypes(assemblies)
       .Where(t => typeof(IEntity).IsAssignableFrom(t))
       .WithMetadata("Type", (t) => t)
       .AsImplementedInterfaces()
       .InstancePerLifetimeScope();

The question is now how to register for each IEntity found my class

Repository<T>: IRepository<T> where T: IEntity

Answer 1

Actually, you don't need to register the entities, you only have to register the repository. Autofac have excellent support for generics, both open and closed types. From the OpenGenerics documentation, register the open generic type of your repository:

builder.RegisterGeneric(typeof(Repository<>))
    .As(typeof(IRepository<>));

You can now resolve closed repository types like this:

var userRepo = container.Resolve<IRepository<User>>();