Question

I am registering a type like thus:

IUnityContainer container = new UnityContainer()
                .RegisterType<IActiveDirectoryUser, ADUser>();

The class ADUser contains 2 constructors, one parameterless, and one with a single parameter. When the resolver goes to resolve it, it chooses the the one with parameters. How do I tell it to use the parameterless contrustor?

Answer 1

When registering the type, use InjectionConstructor to instruct Unity that it should use parameterless constructor:

IUnityContainer container = new UnityContainer();
container.RegisterType<IActiveDirectoryUser, ADUser>(new InjectionConstructor());

Since you are passing no types to InjectionConstructor constructor, Unity will know to use parameterless constructor when instantiating ADUser class.