Get all registered implementations of an interface in Autofac

Question

I need to get, from an IComponentContext, a list of registered Type's that implement a particular interface.

I don't want actual instances of the types, but rather a list of Type of which I could get instances.

I want to use this list to generate subscriptions on a message bus.

How do I get all registered implementations of an interface in Autofac?

Answer 1

I figured this out --

var types = scope.ComponentRegistry.Registrations
    .SelectMany(r => r.Services.OfType<IServiceWithType>(), (r, s) => new { r, s })
    .Where(rs => rs.s.ServiceType.Implements<T>())
    .Select(rs => rs.r.Activator.LimitType);