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MenuStart事件。In the example, an event handler reports on the occurrence of the MenuStart 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MenuStart事件。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,引发此事件。This event is raised when any menu item in the menu is clicked by the user. 此事件可用于执行任务,例如启用和禁用时正在访问菜单不应由用户访问窗体控件。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.