如果发生这种事件，而且关联的事件处理常式中有程序码，就会叫用此程序码。

If one of these events occurs and there is code in the associated event handler, that code is invoked.

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不过，您可以在事件处理常式方法中修改配置，而这代表配置会在呈现之前再计算一次。

However, you can modify layout in your event handler method, which means that layout will be computed once more before rendering.

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在[设计]检视中，选取您要建立事件处理常式的控制项。

In Design view, select the control that you want to create an event handler for.

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