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I have a couple of classes Square : Rectangle : Shape (abstract) and I have a Base Controller inheriting from ApiController that I'd like to use. public abstract class BaseController<T> : ApiController where T : class { public abstract IEnumerable<T> Get() ... } and public class DerivedController : BaseController<Rectangle> { public override IEnumerable<Rectangle> Get() ... } public class AnotherDerivedController : BaseController<Square> { public new IEnumerable<Square> Get() ... } /api/rectangle will properly call IEnumerable<Rectangle> Get() /api/square will give me an error: Multiple actions were found that match the request: System.Linq.IEnumerable`1[Square] Get() on type Web.Api.Controllers.AnotherDerivedController System.Linq.IEnumerable`1[Rectangle] Get() on type Web.Api.Controllers.DerivedController If I change public new IEnumerable<Square> Get() to public override IEnumerable<Square> Get() , I get a compile time error since the return signatures are different How do I get my code to call the proper method? Is it necessary to explicitly register each class's methods in RegisterRoutes?

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