将类型参数传递给基类的接口

Question

StateBase implements iState

WolfState ineherits from StateBase

WolfController inherits from ControllerBase

I want to be able to do a

• WolfState that uses WolfController inheriting from State
• SheepState that uses SheepController and inherits from State

WolfController and SheepController would both inherit from StateController.

How should i declare WolfState?

The way i try to do it doesnt work.

   public interface IState <T> where T : StateController 
{
}

public abstract class State<T> where T : StateController,  IState<T> 
{
}

// THIS IS HOW I WOULD LIKE TO DO IT BUT ITS NOT ACCEPTED
public class WolfState : State<WolfController>
{
}

public class SheepState : State<SheepController>
{
}

Answer 1

It looks like you intend State<T> to implement IState<T> . You currently have a constraint on the type of T . Change the definition of State<T> to:

public abstract class State<T> : IState<T> where T : StateController
{
}