• 2022-06-19
    .NET框架提供有专门的委托类EventHandler,原型如下:
    A: public delegate void EventHandler(object sender, EventArgs e);
    B: public delegate void EventHandler(EventArgs e, object sender);
    C: public event void EventDelegate(object sender, EventArgs e);
    D: public event void EventDelegate(EventArgs e, object sender);
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