使用公共类型的交互接口进行依赖注入（IoC），ninject，MVC3

Question

我有问题。在我第一次通过IRepository模式引入依赖注入（IoC）时，一切都很好。那时我用于每个存储库的个别界面。现在我尝试将所有接口合并到一个通用类型接口中，现在我遇到了ninject控制器factrory的问题。 GetControllerInstance方法中的“在转换时出现异常”

public interface IRepositoryEF<TAble> where TAble: class
{
    IQueryable<TAble> GetAll();

    void Add(TAble);

    TAble GetById(long id);

    TAble DeleteById(long id);
}
public interface MealsRepositoryEF: IRepositoryEF<Meal>
{
     IQueryable<Meal> GetAllAsQueryable()
     {
     }
     void Add(Meal meal)
     {
     }
     Meal GetById(long id)
     {
     }
     Meal DeleteById(long id)
     {
     }
}
public interface GoalsRepositoryEF: IRepositoryEF<Goal>
{
    IQueryable<Goal> GetAllAsQueryable()
    {
    }
    void Add(Goal goal)
    {
    }
    Patient GetById(long id)
    {
    }
    Patient DeleteById(long id)
    {
    }
}



public class NinjectControllerFactory: DefaultControllerFactory {
    private IKernel ninjectKernel;

    public NinjectControllerFactory() {
        ninjectKernel = new StandardKernel();
        AddBindings();
    }

    protected override IController GetControllerInstance(RequestContext requestContext, 
        Type controllerType)
    {
        return controllerType == null? 
            null :
            (IController)ninjectKernel.Get(controllerType);         
    }

    private void AddBindings() {
        // put additional bindings here
        ninjectKernel.Bind<IRepositoryEF<Meal>>().To(typeof(MealsRepositoryEF));
        ninjectKernel.Bind<IRepositoryEF<Goal>>().To(typeof(GoalsRepositoryEF));
    }
}
public class MealsController : Controller
{
    private  IRepositoryEF<Meal> mealsRepository;

    public PatientController(IRepositoryEF<Meal> repo)
    {
        mealsRepository= repo;
    }
}