ppiotrowicz ppiotrowicz - 4 months ago 10
C# Question

autofac's Func<T> to resolve named service

Given registered services:

builder.RegisterType<Foo1>().Named<IFoo>("one").As<IFoo>();
builder.RegisterType<Foo2>().Named<IFoo>("two").As<IFoo>();
builder.RegisterType<Foo3>().Named<IFoo>("three").As<IFoo>();


Can I retrieve named implementations of
IFoo
interface by injecting something like
Func<string, IFoo>
?

public class SomeClass(Func<string, IFoo> foo) {
var f = foo("one");
Debug.Assert(f is Foo1);

var g = foo("two");
Debug.Assert(g is Foo2);

var h = foo("three");
Debug.Assert(h is Foo3);
}


I know I can do it with
Meta<>
, but I don't want to use it.

Answer

You could register your own resolving delegate like this:

builder.Register<Func<string, IFoo>>(c =>
    {
        var cc = c.Resolve<IComponentContext>();
        return named => cc.ResolveNamed<IFoo>(named);
    });