使用接口事件抛出入侵

Question

对于以下代码:

delegate void deffault ();

public interface IBoom {
    event deffault OnBoom; 
}

public class BoomObject : IBoom {

    public event deffault OnBoom;

    public virtual void Start () {

    }

}

public class Grenade : BoomObject {

    public override void Start () {
        if (OnBoom != null)
            OnBoom ();
    }

}

我正在尝试在基类中调用一个事件抛出一个子类,我不知道它为什么抛出异常或者这是一个好习惯.

我得到的例外是:

事件BoomObject.OnBoom' can only appear on the left hand side of += or -= when used outside of the typeBoomObject'

Answer 1

这不是例外,这是编译器错误.

问题是实现的事件public event DelegateType Event;只能在定义事件的类中引发,而不是任何派生类.

如果要使派生类可以访问此事件,请RaiseEvent()在案例类中实现受保护的方法:

public class BoomObject : IBoom {
    public event deffault OnBoom;

    protected void RaiseBoom() {
         if (OnBoom != null)
             OnBoom ();
    }

    public virtual void Start () {
    }
}

public class Grenade : BoomObject {
    public override void Start () {
        RaiseBoom();
    }
}