Unity - Inject different classes for the same interface

Question

I have one interface: IFoo
Two classes implementing that interface: FooOne and FooTwo
And two classes ClassOne and

Answer 1

Have a look at the Unity documentation.

For a more readable config file you should define type aliases for IFoo, FooOne, FooTwo, ClassOne and ClassTwo. Then you need to register the mappings from IFoo to your implementations. You need to set a name for the mappings. For the consumers of IFoo you need to register an InjectionConstructor.

Your config will look something like this:

That's the corresponding test that shows how it works.

UnityConfigurationSection config =
  (UnityConfigurationSection) ConfigurationManager.GetSection("unity");
IUnityContainer container = new UnityContainer();
container.LoadConfiguration(config);
ClassTwo two = container.Resolve();
Assert.IsInstanceOfType(two.Foo, typeof(FooTwo));

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Update

At runtime you can do it like this

IUnityContainer container = new UnityContainer();
container.RegisterType("One");
container.RegisterType("Two");
container.RegisterType(new InjectionConstructor(
  new ResolvedParameter("One")));
container.RegisterType(new InjectionConstructor(
  new ResolvedParameter("Two")));