Form.MenuStart Form.MenuStart Form.MenuStart Form.MenuStart Event


当窗体菜单接收焦点时发生。Occurs when the menu of a form receives focus.

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


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MenuStart事件的发生。In the example, an event handler reports on the occurrence of the MenuStart 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MenuStart事件相关联。Then ensure that the event handler is associated with the MenuStart event.

private void Form1_MenuStart(Object sender, EventArgs e) {

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

Private Sub Form1_MenuStart(sender as Object, e as EventArgs) _ 
     Handles Form1.MenuStart

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

End Sub


当用户单击菜单中的任何菜单项时,将引发此事件。This event is raised when any menu item in the menu is clicked by the user. 您可以使用此事件来执行诸如启用和禁用窗体上的控件的任务,这些控件在访问菜单时不应由用户访问。You can use this event to perform tasks such as enabling and disabling controls on the form that should not be accessed by the user when the menus are being accessed.

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.