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

下面的代码示例演示如何将此成员。The following code example demonstrates the use of this member. 在示例中,事件处理程序报告的匹配项Shown事件。In the example, an event handler reports on the occurrence of the Shown event. 此报告可帮助您了解事件发生的并可以帮助您进行调试。This report helps you to learn when the event occurs and can assist you in debugging. 若要报告或频繁发生的事件上多个事件,请考虑更换MessageBox.ShowConsole.WriteLine或将消息附加到多行TextBoxTo 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.

若要运行此代码示例,请将其粘贴到包含类型的实例的项目Form名为Form1To run the example code, paste it into a project that contains an instance of type Form named Form1. 然后,确保事件处理程序相关联Shown事件。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

Shown第一次显示一个窗体仅引发事件; 随后降至最低、 最大化、 还原、 隐藏、 显示,或使无效并重新绘制不会引发此事件。The 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. 窗体的事件的顺序的详细信息,请参阅在 Windows 窗体中的事件顺序的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