Menu.MenuItemCollection.Count 屬性

public:
 property int Count { int get(); };

public int Count { get; }

member this.Count : int

Public ReadOnly Property Count As Integer

屬性值

收藏中的物件數量 MenuItem 。

實作

範例

以下程式碼範例說明如何建立一個主選單，myMainMenu包含一個 、 MenuItem，包含三個子選單項目：File、、 NewOpenExit和 。 利用這個 Count 屬性，你會在選單中計算物件數量 File ，並在訊息框中顯示這個數字。 此範例要求你已經建立了一個 Form 名為 Form1的 。

public:
   void InitializeMyMenu()
   {
      // Create the MainMenu Object*.
      MainMenu^ myMainMenu = gcnew MainMenu;
      
      // Create the MenuItem objects.
      MenuItem^ fileMenu = gcnew MenuItem( "&File" );
      MenuItem^ newFile = gcnew MenuItem( "&New" );
      MenuItem^ openFile = gcnew MenuItem( "&Open" );
      MenuItem^ exitProgram = gcnew MenuItem( "E&xit" );
      
      // Add the File menu item to myMainMenu.
      myMainMenu->MenuItems->Add( fileMenu );
      
      // Add three submenus to the File menu.
      fileMenu->MenuItems->Add( newFile );
      fileMenu->MenuItems->Add( openFile );
      fileMenu->MenuItems->Add( exitProgram );
      
      // Assign myMainMenu to the form.
      this->Menu = myMainMenu;
      
      // Count the number of objects in the File menu and display the result.
      String^ objectNumber = fileMenu->MenuItems->Count.ToString();
      MessageBox::Show( "Number of objects in the File menu = " + objectNumber );
   }

public void InitializeMyMenu()
{
    // Create the MainMenu object.
    MainMenu myMainMenu = new MainMenu();
    
    // Create the MenuItem objects.
    MenuItem fileMenu = new MenuItem("&File");
    MenuItem newFile = new MenuItem("&New");
    MenuItem openFile = new MenuItem("&Open");
    MenuItem exitProgram = new MenuItem("E&xit");
    
    // Add the File menu item to myMainMenu.
    myMainMenu.MenuItems.Add(fileMenu);
    
    // Add three submenus to the File menu.
    fileMenu.MenuItems.Add(newFile);
    fileMenu.MenuItems.Add(openFile);
    fileMenu.MenuItems.Add(exitProgram);
    
    // Assign myMainMenu to the form.
    this.Menu = myMainMenu;
    
    // Count the number of objects in the File menu and display the result.
    string objectNumber = fileMenu.MenuItems.Count.ToString();
    MessageBox.Show("Number of objects in the File menu = " + objectNumber);
}

Public Sub InitializeMyMenu()
   ' Create the MainMenu object.
   Dim myMainMenu As New MainMenu()
   
   ' Create the MenuItem objects.
   Dim fileMenu As New MenuItem("&File")
   Dim newFile As New MenuItem("&New")
   Dim openFile As New MenuItem("&Open")
   Dim exitProgram As New MenuItem("E&xit")
   
   ' Add the File menu item to myMainMenu.
   myMainMenu.MenuItems.Add(fileMenu)
   
   ' Add three submenus to the File menu.
   fileMenu.MenuItems.Add(newFile)
   fileMenu.MenuItems.Add(openFile)
   fileMenu.MenuItems.Add(exitProgram)
   
   ' Assign myMainMenu to the form.
   Me.Menu = myMainMenu
   
   ' Count the number of objects in the File menu and display the result.
   Dim objectNumber As String = fileMenu.MenuItems.Count.ToString()
   MessageBox.Show(("Number of objects in the File menu = " + objectNumber))
End Sub 
'InitializeMyMenu

備註

屬性 Count 會記錄分配到集合的 MenuItem 物件數量。 你可以用 Count 屬性值作為迴圈的上界來遍歷集合。 請記住，集合的索引值是以零為基礎，因此你必須從迴圈變數中減去一。 若未考慮此點，將超出集合上限並產生例外。

另請參閱

• MenuItems