Form.Shown Form.Shown Form.Shown Form.Shown Event

定义

只要窗体是首次显示就发生。Occurs whenever the form is first displayed.

public:
 event EventHandler ^ Shown;
public event EventHandler Shown;
member this.Shown : EventHandler 
Public Custom Event Shown 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Shown事件的发生。In the example, an event handler reports on the occurrence of the Shown 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MessageBox.ShowConsole.WriteLine消息替换为多行或将TextBox其追加到多行。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Form Form1的类型的实例的项目中。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Shown事件相关联。Then ensure that the event handler is associated with the Shown event.

private void Form1_Shown(Object sender, EventArgs e) {

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

}
Private Sub Form1_Shown(sender as Object, e as EventArgs) _ 
     Handles Form1.Shown

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

End Sub

注解

仅在第一次显示窗体时才引发事件;然后,最小化、最大化、还原、隐藏、显示或无效和重画将不会引发此事件。ShownThe Shown event is only raised the first time a form is displayed; subsequently minimizing, maximizing, restoring, hiding, showing, or invalidating and repainting will not raise this event. 有关窗体事件顺序的详细信息,请参阅Windows 窗体中事件的顺序For more information about the order of events of a form, see Order of Events in Windows Forms.

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