Menu.MenuItemCollection.Count 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

获取一个值，通过该值指示集合中 MenuItem 对象的总数。

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

public int Count { get; }

member this.Count : int

Public ReadOnly Property Count As Integer

属性值

Int32

集合中 MenuItem 对象的数目。

实现

Count

示例

下面的代码示例演示如何创建一个主菜单，myMainMenu其中一MenuItemFile个菜单包含三个子菜单：New，Open以及Exit。 使用属性 Count 计算菜单中的对象 File 数，并在消息框中显示此数字。 此示例要求你已创建一个 Form 命名 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

注解

该 Count 属性保存分配给集合的对象 MenuItem 数。 可以使用 Count 属性值作为循环的上限来循环访问集合。 请记住，集合的索引值为从零开始的索引，因此必须从循环变量中减去一个索引。 如果不考虑这一点，将超出集合的上限并引发异常。

另请参阅

• MenuItems