如何设置一个参数，该参数接受以后要声明的对象？

Question

As I made my game, I stumbled upon a slight problem. I have a method Attack() that must execute when my character attacks an enemy. For example:

public override void Attack(Object theEnemy)
{          
      theEnemy.Health = theEnemy.Health - this.attack
}

Example: I attack an Elf. The Elf object needs to be the parameter, the problem is that the parameter is looking for Object, not Elf. Same goes for if I want to attack other enemy objects such as Orc, Dwarf etc. I need the parameter to be able to accept any object. Is it possible?

Answer 1

You can use interface in this case eg:

interface IEnemy
{
    void TakeDamage(int attackPower);
}

public Elf: IEnemy
{
    // sample implementation
    public void TakeDamage(int attackPower)
    {
        this.Health -= attackPower - this.Defense;
    }
}

// later on use IEnemy, which is implemented by all enemy creatures
void Attack(IEnemy theEnemy)
{          
      theEnemy.TakeDamage(attack)
}

Answer 2

Seems like anything that can be "attacked" must implement an interface giving access to the required properties and/or methods.

So for example you could do

public interface IAttackable
{
    void ReduceHealth(int amount);
}

Then implement it for any creature which is attackable - ie, Elf

public class Elf : IAttackable
{
    public void ReduceHealth(int amount)
    {
        this.Health -= amount;
    }
}

Then usage would be

public override void Attack(IAttackable theEnemy)
{          
      theEnemy.ReduceHealth(this.attack);
}

Answer 3

You can create an interface that each enemy object implements or you could create a base class that each enemby object is based on.

public interface IEnemyCreature{

void ReduceHealth(int Amount)

}

public Elf: IEnemyCreature{
...
}

Edit - WalkHard has described the code better than I 9-)

Answer 4

Best is to Seperate the Concerns and use OOP concepts. Use Interface.

interface IGameMethods
{
    void Attack(int yourValueForAttackMethod);
}

for implementation

public Elf: IGameMethods
{
    // implementation of IGameMethods
}