哪个事件我应该使用这个？

Which event should I use for this?

推荐答案

Control.Leave或Control.LostFocus:

当您使用键盘更改焦点（⇆，⇧ + ⇆，等等），通过调用选择或SelectNextControl方法，或通过设置ContainerControl.ActiveControl属性设置为当前的形式，出现下列顺序焦点事件：

When you change the focus by using the keyboard (⇆, ⇧+⇆, and so on), by calling the Select or SelectNextControl methods, or by setting the ContainerControl.ActiveControl property to the current form, focus events occur in the following order:    进入    GotFocus    离开    Validating    Validated    引发LostFocus    Enter GotFocus Leave Validating Validated LostFocus

当您使用鼠标或通过调用更改焦点重点方法，会出现下列顺序焦点事件：

When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order:

如果在CausesValidation属性设置为false，Validating和Validated事件燮pressed。

If the CausesValidation property is set to false, the Validating and Validated events are suppressed.