Form.Deactivate 事件

定义

当窗体失去焦点并不再是活动窗体时发生。Occurs when the form loses focus and is no longer the active form.

public:
 event EventHandler ^ Deactivate;
public event EventHandler Deactivate;
member this.Deactivate : EventHandler 
Public Custom Event Deactivate As EventHandler 

示例

下面的示例演示如何使用此成员。The following example demonstrates the use of this member. 在此示例中,事件处理程序报告 Deactivate 事件的发生。In the example, an event handler reports on the occurrence of the Deactivate event. 此报表可帮助你了解何时发生事件,并可帮助你进行调试。This report helps you to learn when the event occurs and can assist you in debugging. 若要报告多个事件或频繁发生的事件,请考虑将 MessageBox.Show 替换为 Console.WriteLine 或将消息附加到多行 TextBox中。To report on multiple events or on events that occur frequently, consider replacing MessageBox.Show with Console.WriteLine or appending the message to a multiline TextBox.

若要运行示例代码,请将其粘贴到包含名为 Form1Form 类型实例的项目中。To run the example code, paste it into a project that contains an instance of type Form named Form1. 然后,确保事件处理程序与 Deactivate 事件关联。Then ensure that the event handler is associated with the Deactivate event.

private void Form1_Deactivate(Object sender, EventArgs e) {

   MessageBox.Show("You are in the Form.Deactivate event.");

}
Private Sub Form1_Deactivate(sender as Object, e as EventArgs) _ 
     Handles Form1.Deactivate

   MessageBox.Show("You are in the Form.Deactivate event.")

End Sub

注解

你可以使用此事件来执行任务,例如,使用停用的窗体中的数据更新应用程序中的另一个窗口。You can use this event to perform tasks such as updating another window in your application with data from the deactivated form.

有关处理事件的详细信息,请参阅处理和引发事件For more information about handling events, see Handling and Raising Events.

适用于

另请参阅