由控件或其父控件调用的事件
如果 win 窗体上的组框中有一个按钮，并且当“单击”事件发生时，那么实际上是谁在调用该事件。它是按钮控件还是它的父控件，即 GroupBox。
If there is a button within a group box on a win form, and when the "click" event occurs, then who is actually calling the Event. Is it the button contorl or its parent i.e. GroupBox.
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如果您编写了本机 Windows GUI 程序，那么收到单击消息的将是组框。按钮向其父母发送通知。但在 Winforms 中，这会通过子类化和让容器窗口将消息反射回子控件来重新路由。
事件总是起源于控件。他们的 OnClick() 方法在点击的情况下。然而，您仍然在更高级别的窗口中处理该事件。通常是表单，而不是组框。事件处理程序的 sender 参数传递对控件的引用。与本地方式相比，可以选择处理事件的确切位置是一个主要优势。它使控件具有高度适应性和可组合性。
If you'd have written a native Windows GUI program then it would be the group box that got the click message. Buttons send notification to their parents. But that gets re-routed in Winforms, both through sub-classing and having the container window reflect messages back to the child control.
Events always originate at the control. Their OnClick() method in case of a click. You however still handle the event at a higher level window. Typically the form, not the groupbox. The sender argument of the event handler passes a reference to the control. Having a choice over exactly where you handle the event is a major advantage over the native way. It makes controls highly adaptable and composable.