Cannot resolve the controller - asp.net

Question

Previously I was not using an interface for my generic repository. When I extracted the interface from my generic repository, I added two constructors: a parameterless and a parameterized constructors I am getting the following error:
{"Resolution of the dependency failed, type = \"NascoBenefitBuilder.Controllers.ODSController\", name = \"(none)\".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The current type, ControllerLib.Models.Generic.IGenericRepository, is an interface and cannot be constructed. Are you missing a type mapping?
-----------------------------------------------
At the time of the exception, the container was:
Resolving NascoBenefitBuilder.Controllers.ODSController,(none)
Resolving parameter \"repo\" of constructor NascoBenefitBuilder.Controllers.ODSController(ControllerLib.Models.Generic.IGenericRepository repo)
Resolving ControllerLib.Models.Generic.IGenericRepository,(none)"}
My Controller at the beginning:
public class ODSController : ControllerBase
{
IGenericRepository _generic = new GenericRepository();
}
After extracting the interface and use it in controller:
public class ODSController : ControllerBase
{
IGenericRepository _generic;
public ODSController() : this(new GenericRepository())
{
}
public ODSController(IGenericRepository repo)
{
_generic = repo;
}
}
When I use parameterized constructor it is throwing error mentioned above.
Can anyone help me to overcome this problem?

Answer 1

You no longer need the default constructor:
public class ODSController : ControllerBase
{
private readonly IGenericRepository _repository;
public ODSController(IGenericRepository repository)
{
_repository = repository;
}
}
And then make sure you've properly configured your Unity container:
IUnityContainer container = new UnityContainer()
.RegisterType<IGenericRepository, GenericRepository>();
And that you are using the Unity controller factory in Application_Start:
ControllerBuilder.Current.SetControllerFactory(typeof(UnityControllerFactory));