ToolBarButton.DropDownMenu 属性

定义

获取或设置要显示在下拉工具栏按钮中的菜单。Gets or sets the menu to be displayed in the drop-down toolbar button.

public:
 property System::Windows::Forms::Menu ^ DropDownMenu { System::Windows::Forms::Menu ^ get(); void set(System::Windows::Forms::Menu ^ value); };
[System.ComponentModel.TypeConverter(typeof(System.ComponentModel.ReferenceConverter))]
public System.Windows.Forms.Menu DropDownMenu { get; set; }
[<System.ComponentModel.TypeConverter(typeof(System.ComponentModel.ReferenceConverter))>]
member this.DropDownMenu : System.Windows.Forms.Menu with get, set
Public Property DropDownMenu As Menu

属性值

Menu

要显示在下拉工具栏按钮中的 ContextMenuA ContextMenu to be displayed in the drop-down toolbar button. 默认值为 nullThe default is null.

属性

例外

分配的对象不是 ContextMenuThe assigned object is not a ContextMenu.

示例

下面的代码示例创建一个 ToolBar 和三个 ToolBarButton 控件,将按钮分配给工具栏,并设置一些按钮的通用属性。The following code example creates a ToolBar and three ToolBarButton controls, assigns the buttons to the toolbar, and sets some of the buttons' common properties. 此代码要求创建了和 ImageListToolTip Form 并且至少为 ImageList Image 其分配了一个。This code requires that an ImageList, ToolTip and a Form have been created and the ImageList has at least one Image assigned to it.

public:
   void InitializeMyToolBar()
   {
      // Create the ToolBar, ToolBarButton controls, and menus.
      ToolBarButton^ toolBarButton1 = gcnew ToolBarButton( "Open" );
      ToolBarButton^ toolBarButton2 = gcnew ToolBarButton;
      ToolBarButton^ toolBarButton3 = gcnew ToolBarButton;
      ToolBar^ toolBar1 = gcnew ToolBar;
      MenuItem^ menuItem1 = gcnew MenuItem( "Print" );
      array<MenuItem^>^ temp1 = {menuItem1};
      System::Windows::Forms::ContextMenu^ contextMenu1 =
         gcnew System::Windows::Forms::ContextMenu( temp1 );
      
      // Add the ToolBarButton controls to the ToolBar.
      toolBar1->Buttons->Add( toolBarButton1 );
      toolBar1->Buttons->Add( toolBarButton2 );
      toolBar1->Buttons->Add( toolBarButton3 );
      
      // Assign an ImageList to the ToolBar and show ToolTips.
      toolBar1->ImageList = imageList1;
      toolBar1->ShowToolTips = true;
      
      /* Assign ImageIndex, ContextMenu, Text, ToolTip, and 
         Style properties of the ToolBarButton controls. */
      toolBarButton2->Style = ToolBarButtonStyle::Separator;
      toolBarButton3->Text = "Print";
      toolBarButton3->Style = ToolBarButtonStyle::DropDownButton;
      toolBarButton3->ToolTipText = "Print";
      toolBarButton3->ImageIndex = 0;
      toolBarButton3->DropDownMenu = contextMenu1;
      
      // Add the ToolBar to a form.
      Controls->Add( toolBar1 );
   }
public void InitializeMyToolBar()
 {
    // Create the ToolBar, ToolBarButton controls, and menus.
    ToolBarButton toolBarButton1 = new ToolBarButton("Open");
    ToolBarButton toolBarButton2 = new ToolBarButton();
    ToolBarButton toolBarButton3 = new ToolBarButton();
    ToolBar toolBar1 = new ToolBar();
    MenuItem menuItem1 = new MenuItem("Print");
    ContextMenu contextMenu1 = new ContextMenu(new MenuItem[]{menuItem1});

    // Add the ToolBarButton controls to the ToolBar.
    toolBar1.Buttons.Add(toolBarButton1);
    toolBar1.Buttons.Add(toolBarButton2);
    toolBar1.Buttons.Add(toolBarButton3);
 
    // Assign an ImageList to the ToolBar and show ToolTips.
    toolBar1.ImageList = imageList1;
    toolBar1.ShowToolTips = true;
 
    /* Assign ImageIndex, ContextMenu, Text, ToolTip, and 
       Style properties of the ToolBarButton controls. */
    toolBarButton2.Style = ToolBarButtonStyle.Separator;
    toolBarButton3.Text = "Print";
    toolBarButton3.Style = ToolBarButtonStyle.DropDownButton;
    toolBarButton3.ToolTipText = "Print";
    toolBarButton3.ImageIndex = 0;
    toolBarButton3.DropDownMenu = contextMenu1;
 
    // Add the ToolBar to a form.
    Controls.Add(toolBar1);
 }
 
Public Sub InitializeMyToolBar()
    ' Create the ToolBar, ToolBarButton controls, and menus.
    Dim toolBarButton1 As New ToolBarButton("Open")
    Dim toolBarButton2 As New ToolBarButton()
    Dim toolBarButton3 As New ToolBarButton()
    Dim toolBar1 As New ToolBar()
Dim menuItem1 As New MenuItem("Print")
Dim contextMenu1 As New ContextMenu(New MenuItem(){menuItem1})
    
    ' Add the ToolBarButton controls to the ToolBar.
    toolBar1.Buttons.Add(toolBarButton1)
    toolBar1.Buttons.Add(toolBarButton2)
    toolBar1.Buttons.Add(toolBarButton3)
    
    ' Assign an ImageList to the ToolBar and show ToolTips.
    toolBar1.ImageList = imageList1
    toolBar1.ShowToolTips = True
    
    ' Assign ImageIndex, ContextMenu, Text, ToolTip, and
    ' Style properties of the ToolBarButton controls. 
    toolBarButton2.Style = ToolBarButtonStyle.Separator
    toolBarButton3.Text = "Print"
    toolBarButton3.Style = ToolBarButtonStyle.DropDownButton
    toolBarButton3.ToolTipText = "Print"
    toolBarButton3.ImageIndex = 0
    toolBarButton3.DropDownMenu = contextMenu1
    
    ' Add the ToolBar to a form.
    Controls.Add(toolBar1)
End Sub

注解

您可以指定在 ContextMenu 单击下拉按钮时要显示的。You can specify a ContextMenu to be displayed when the drop-down button is clicked. 除非将 Style 属性值设置为,否则不会使用此属性 ToolBarButtonStyle.DropDownButtonThis property is not used unless the Style property value is set to ToolBarButtonStyle.DropDownButton.

备注

尽管 DropDownMenu 属性定义为 Menu 类型,但你必须为其分配, ContextMenu 使其正确显示。Although the DropDownMenu property is defined as a Menu type, you must assign it a ContextMenu for it to display properly. 如果要创建自己的 MenuItem 派生类,则必须将该对象分配给, ContextMenu 并将分配给 ContextMenu DropDownMenu 属性。If you are creating your own MenuItem derived class you must assign that object to a ContextMenu and assign the ContextMenu to the DropDownMenu property.

适用于

另请参阅