MVC 3 beta + Dependency Resolver + Unity = got problem

Question

I'm tried to use Dependency Resolver with Unity, and got some problem when my Controller creating. Here example of controller:

public class AccountController : Controller
{
    private readonly ICourseService _courseService;

    public AccountController(ICourseService courseService)
    {
         _courseService = courseService;
    }
}

But, when Controller try to create - i got an exception "No parameterless constructor defined for this object." I even try to add default constructor for this controller, but courseService didn't create. Also try to add property with [Dependency] attribute - nothing happened. Here is Dependency Resolver class:

public class UnityDependencyResolver : IDependencyResolver
{
    private readonly IUnityContainer _container;
    public UnityDependencyResolver(IUnityContainer container)
    {
        _container = container;
    }

    public object GetService(Type serviceType)
    {
        return _container.IsRegistered(serviceType) ? _container.Resolve(serviceType) : null;
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return _container.IsRegistered(serviceType) ? _container.ResolveAll(serviceType) : new List<object>();
    }
}

and Global.asax.cs:

    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();

        RegisterGlobalFilters(GlobalFilters.Filters);
        RegisterRoutes(RouteTable.Routes);

        var container = new UnityContainer();
        container.RegisterType<ICourseService, CourseService>();

        DependencyResolver.SetResolver(new UnityDependencyResolver(container));
    }

Can anyone help me ?

Answer 1

Old post but these other answers are flat out wrong. Had this problem myself today, and you definitely do not need to register the controllers or a controller factory. This message just means that something in the dependency hierarchy for the controller is not registered. E.g. If your controller requires IService in it's constructor and IService requires IRepository in its constructor, but you forgot to register IRepository you will get this error.

Answer 2

Your IDependencyResolver implementation requires that AccountController is registered. Try adding this registation otherwise it will return null and MVC will try to create the controller with the Activator which requires a parameterless ctor.