Question

I am upgrading code from Autofac 1.4 to 2.1.10 Release Candidate.

My module previously performed registration like this:

builder.RegisterCollection<IExceptionHandler>()
                .As<IEnumerable<IExceptionHandler>>()
                .FactoryScoped();
builder.Register<AspNetExceptionHandler>()
                .As<IExceptionHandler>()
                .MemberOf<IEnumerable<IExceptionHandler>>()
                .FactoryScoped();

Now, RegisterCollection has no parameterless overload. I don t care about assigning it a name. Assuming it s OK to just pass in null, my code looks like this in 2.1:

builder.RegisterCollection<IExceptionHandler>(null)
                .As<IEnumerable<IExceptionHandler>>()
                .InstancePerDependency();
builder.RegisterType<AspNetExceptionHandler>()
                .As<IExceptionHandler>()
                .MemberOf<IEnumerable<IExceptionHandler>>(null)
                .InstancePerDependency();

However, when I compile, I get the following error regarding .MemberOf:

Using the generic method Autofac.RegistrationExtensions.MemberOf(Autofac.Builder.RegistrationBuilder, string) requires 3 type arguments

I tried putting in a collection name instead of null, just in case, and that had no effect.

What s the proper way to register collections in 2.1?

Answer 1

As I understand it, you just register a bunch of IExceptionHandler types, and then when you request an IEnumerable<IExceptionHandler> Autofac 2 will just take care of everything for you.

From the NewInV2 page:

builder.RegisterType<A1>().As<IA>();
builder.RegisterType<A2>().As<IA>();

var container = builder.Build();

// Contains an instance of both A1 and A2
Assert.AreEqual(2, container.Resolve<IEnumerable<IA>>().Count());

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