Menu.MenuItemCollection.Contains(MenuItem) 方法

public:
 bool Contains(System::Windows::Forms::MenuItem ^ value);

public bool Contains(System.Windows.Forms.MenuItem value);

member this.Contains : System.Windows.Forms.MenuItem -> bool

Public Function Contains (value As MenuItem) As Boolean

參數

傳回

true 若 是 MenuItem 集合的成員;否則， false。

範例

在這個例子中，你建立一個主選單， myMainMenu包含兩個 MenuItem 物件， File 和 Edit。 選File單包含三個子選單項目，分別為 New、 、 OpenExit和 。 透過此 Contains 方法，你可以檢查菜單集合中 File 是否包含該項目 Open。 如果該項目存在，你會將結果顯示在文字框中。 此程式要求你已建立一個 Form 名為 Form1的 。

public:
   void InitializeMenu()
   {
      // Create the MainMenu object.
      MainMenu^ myMainMenu = gcnew MainMenu;
      
      // Create the MenuItem objects.
      MenuItem^ fileMenu = gcnew MenuItem( "&File" );
      MenuItem^ editMenu = gcnew MenuItem( "&Edit" );
      MenuItem^ newFile = gcnew MenuItem( "&New" );
      MenuItem^ openFile = gcnew MenuItem( "&Open" );
      MenuItem^ exitProgram = gcnew MenuItem( "E&xit" );
      
      // Add the MenuItem objects to myMainMenu.
      myMainMenu->MenuItems->Add( fileMenu );
      myMainMenu->MenuItems->Add( editMenu );
      
      // Add three submenus to the File menu.
      fileMenu->MenuItems->Add( newFile );
      fileMenu->MenuItems->Add( openFile );
      fileMenu->MenuItems->Add( exitProgram );
      
      // Assign myMainMenu to the form.
      Menu = myMainMenu;
      
      // Check that the File menu contains the Open menu item.
      if ( fileMenu->MenuItems->Contains( openFile ) )
      {
         MessageBox::Show( "The File menu contains 'Open' " + fileMenu->Text );
      }
   }

public void InitializeMenu()
{
    // Create the MainMenu object.
    MainMenu myMainMenu = new MainMenu();
    
    // Create the MenuItem objects.
    MenuItem fileMenu = new MenuItem("&File");
    MenuItem editMenu = new MenuItem("&Edit");
    MenuItem newFile = new MenuItem("&New");
    MenuItem openFile = new MenuItem("&Open");
    MenuItem exitProgram = new MenuItem("E&xit");
    
    // Add the MenuItem objects to myMainMenu.
    myMainMenu.MenuItems.Add(fileMenu);
    myMainMenu.MenuItems.Add(editMenu);
    
    // Add three submenus to the File menu.
    fileMenu.MenuItems.Add(newFile);
    fileMenu.MenuItems.Add(openFile);
    fileMenu.MenuItems.Add(exitProgram);
    
    // Assign myMainMenu to the form.
    Menu = myMainMenu;
    
    // Check that the File menu contains the Open menu item.
    if (fileMenu.MenuItems.Contains(openFile))
    {
        MessageBox.Show("The File menu contains 'Open' ", fileMenu.Text);
    }
}

Public Sub InitializeMenu()
   ' Create the MainMenu object.
   Dim myMainMenu As New MainMenu()
   
   ' Create the MenuItem objects.
   Dim fileMenu As New MenuItem("&File")
   Dim editMenu As New MenuItem("&Edit")
   Dim newFile As New MenuItem("&New")
   Dim openFile As New MenuItem("&Open")
   Dim exitProgram As New MenuItem("E&xit")
   
   ' Add the MenuItem objects to myMainMenu.
   myMainMenu.MenuItems.Add(fileMenu)
   myMainMenu.MenuItems.Add(editMenu)
   
   ' Add three submenus to the File menu.
   fileMenu.MenuItems.Add(newFile)
   fileMenu.MenuItems.Add(openFile)
   fileMenu.MenuItems.Add(exitProgram)
   
   ' Assign myMainMenu to the form.
   Menu = myMainMenu
   
   ' Check that the File menu contains the Open menu item.
   If fileMenu.MenuItems.Contains(openFile) Then
      MessageBox.Show("The File menu contains 'Open' ", fileMenu.Text)
   End If
End Sub 
'InitializeMenu

備註

此方法可讓您在嘗試對 執行操作MenuItem前，判斷 a MenuItem 是否屬於集合。 你可以用這個方法確認 a MenuItem 是否已被加入或仍然是該集合的成員。