MenuItem.OnClick(EventArgs) 方法

protected:
 virtual void OnClick(EventArgs ^ e);

protected virtual void OnClick(EventArgs e);

abstract member OnClick : EventArgs -> unit
override this.OnClick : EventArgs -> unit

Protected Overridable Sub OnClick (e As EventArgs)

參數

範例

以下程式碼範例示範如何在點擊 a Click 時使用MenuItem事件執行任務。 範例中建立一個MainMenu被呼叫mainMenu1的，並加入兩個MenuItem物件，（topMenuItemFile）和menuItem1（Open）。 接著它會將 Click 事件 menuItem1_Click 與事件處理程序連結。 當使用者點擊 Open 選單項目時，就會 OpenFileDialog 初始化並顯示。 這個範例要求你建立了一個 Form 名為 Form1的 。

public:
   void CreateMyMenu()
   {
      // Create a main menu object.
      MainMenu^ mainMenu1 = gcnew MainMenu;

      // Create empty menu item objects.
      MenuItem^ topMenuItem = gcnew MenuItem;
      MenuItem^ menuItem1 = gcnew MenuItem;

      // Set the caption of the menu items.
      topMenuItem->Text = "&File";
      menuItem1->Text = "&Open";

      // Add the menu items to the main menu.
      topMenuItem->MenuItems->Add( menuItem1 );
      mainMenu1->MenuItems->Add( topMenuItem );

      // Add functionality to the menu items using the Click event. 
      menuItem1->Click += gcnew System::EventHandler( this, &Form1::menuItem1_Click );

      // Assign mainMenu1 to the form.
      this->Menu = mainMenu1;
   }

private:
   void menuItem1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      // Create a new OpenFileDialog and display it.
      OpenFileDialog^ fd = gcnew OpenFileDialog;
      fd->DefaultExt = "*.";
      fd->ShowDialog();
   }

public void CreateMyMenu()
{
    // Create a main menu object.
    MainMenu mainMenu1 = new MainMenu();

    // Create empty menu item objects.
    MenuItem topMenuItem = new MenuItem();
    MenuItem menuItem1 = new MenuItem();
          
    // Set the caption of the menu items.
    topMenuItem.Text = "&File";
    menuItem1.Text = "&Open";

    // Add the menu items to the main menu.
        topMenuItem.MenuItems.Add(menuItem1);
    mainMenu1.MenuItems.Add(topMenuItem);
                
    // Add functionality to the menu items using the Click event. 
    menuItem1.Click += new System.EventHandler(this.menuItem1_Click);

    // Assign mainMenu1 to the form.
    this.Menu=mainMenu1;
}

private void menuItem1_Click(object sender, System.EventArgs e)
{	
           // Create a new OpenFileDialog and display it.
   OpenFileDialog fd = new OpenFileDialog();
       fd.DefaultExt = "*.*";
   fd.ShowDialog();
}

 Public Sub CreateMyMenu()
   ' Create a main menu object.
   Dim mainMenu1 As New MainMenu()

   ' Create empty menu item objects.
   Dim topMenuItem As New MenuItem()
   Dim menuItem1 As New MenuItem()

   ' Set the caption of the menu items.
   topMenuItem.Text = "&File"
   menuItem1.Text = "&Open"

   ' Add the menu items to the main menu.
   topMenuItem.MenuItems.Add(menuItem1)
   mainMenu1.MenuItems.Add(topMenuItem)

   ' Add functionality to the menu items using the Click event. 
   AddHandler menuItem1.Click, AddressOf Me.menuItem1_Click
   ' Assign mainMenu1 to the form.
   Me.Menu = mainMenu1
End Sub


Private Sub menuItem1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
   ' Create a new OpenFileDialog and display it.
   Dim fd As New OpenFileDialog()
   fd.DefaultExt = "*.*"
   fd.ShowDialog()
End Sub

備註

發起事件會透過代理呼叫事件處理者。 欲了解更多資訊，請參閱 處理與提升事件。

給繼承者的注意事項

在導出類別中覆 OnClick(EventArgs) 寫時，務必呼叫基底類別的方法 OnClick(EventArgs) 。