c# - CSharp 虚方法和参数

Question

public abstract class State
{
public virtual Enter(/* THIS NEED A PARAMETER */)
{
// an empty method
}
}

public class PlayerState : State
{
public override Enter(Player pl)
{
// method implementation
}
}

public class GoalkeeperState : State
{
public override Enter(Goalkeeper gk)
{
// method implementation
}
}

//EXAMPLE OF USE
public State globalState;
globalState.Enter(owner);
// OWNER CAN BE PLAYER OR GOALKEEPER

我知道虚拟方法和覆盖方法需要具有相同的“打印”。所以这里有一个设计缺陷。这样的事情也是可能的。我怎样才能做到这一点 ？你会怎么做？

Answer 1

您可以在此处使用泛型：

public abstract class State<T>
{
    public virtual Enter(T item)
    {
        // an empty method
    }
}

public class PlayerState : State<Player>
{
    public override Enter(Player pl)
    {
        // method implementation
    }
}

public class GoalkeeperState : State<Goalkeeper>
{
    public override Enter(Goalkeeper gk)
    {
        // method implementation
    }
}

Answer 2

你可以定义

public override Enter(State pl)

或者，但我不确定我是否理解您想要正确执行的操作，如下所示：

public class Player
{
    public virtual Enter() {}
}

public class GoalKeeper : Player
{
    public override Enter() {}
}


public class State
{
    public List<Player> players {get; private set;}

    public State() { players = new List<Player(); }
}