c# - 什么时候应该覆盖 OnEvent 而不是在继承时订阅事件

Question

什么时候应该做以下事情？

class Foo : Control
{
    protected override void OnClick(EventArgs e)
    {
        // new code here
    }
}

与此相反？

class Foo : Control
{
    public Foo()
    {
        this.Click += new EventHandler(Clicked);
    }

    private void Clicked(object sender, EventArgs e)
    {
        // code
    }
}

Answer 1

覆盖而不是附加委托(delegate)将产生更高效的代码，因此通常建议您始终尽可能这样做。有关详细信息，请参阅 this MSDN article .这是一个相关的引用:

The protected OnEventName method also allows derived classes to override the event without attaching a delegate to it. A derived class must always call the OnEventName method of the base class to ensure that registered delegates receive the event.