MenuAction 类
更新：2007 年 11 月
一个表示要在设计器中执行的操作的上下文菜单项。
命名空间： Microsoft.Windows.Design.Interaction
程序集： Microsoft.Windows.Design.Extensibility（在 Microsoft.Windows.Design.Extensibility.dll 中）
语法
声明
Public Class MenuAction _
Inherits MenuBase
用法
Dim instance As MenuAction
public class MenuAction : MenuBase
public ref class MenuAction : public MenuBase
public class MenuAction extends MenuBase
备注
使用 MenuAction 类可以在 WPF 设计器中定义一个上下文菜单项。
若要显示上下文菜单项，请从 ContextMenuProvider 类中继承并创建 MenuAction 项和关联的 MenuGroup。这些菜单对象通常是在从 PrimarySelectionContextMenuProvider（该类在主选项内容上显示上下文菜单）派生的类的构造函数中创建的。
在 Execute 事件处理程序中为您的 MenuAction 实现逻辑。
MenuAction 类与 WPF 命令系统兼容。使用 Command 属性，以编程方式调用 MenuAction，而不是通过用户界面调用。
示例
下面的代码示例演示如何设置两个 MenuAction 项，这两个项可在设计时设置控件的 Background 属性。有关更多信息，请参见演练：创建 MenuAction。
Private setBackgroundToBlueMenuAction As MenuAction
Private clearBackgroundMenuAction As MenuAction
...
' The provider's constructor sets up the MenuAction objects
' and the the MenuGroup which holds them.
Public Sub New()
' Set up the MenuAction which sets the control's
' background to Blue.
setBackgroundToBlueMenuAction = New MenuAction("Blue")
setBackgroundToBlueMenuAction.Checkable = True
AddHandler setBackgroundToBlueMenuAction.Execute, AddressOf SetBackgroundToBlue_Execute
' Set up the MenuAction which sets the control's
' background to its default value.
clearBackgroundMenuAction = New MenuAction("Cleared")
clearBackgroundMenuAction.Checkable = True
AddHandler clearBackgroundMenuAction.Execute, AddressOf ClearBackground_Execute
' Set up the MenuGroup which holds the MenuAction items.
Dim backgroundFlyoutGroup As New MenuGroup("SetBackgroundsGroup", "Set Background")
' If HasDropDown is false, the group appears inline,
' instead of as a flyout. Set to true.
backgroundFlyoutGroup.HasDropDown = True
backgroundFlyoutGroup.Items.Add(setBackgroundToBlueMenuAction)
backgroundFlyoutGroup.Items.Add(clearBackgroundMenuAction)
Me.Items.Add(backgroundFlyoutGroup)
' The UpdateItemStatus event is raised immediately before
' this provider shows its tabs, which provides the opportunity
' to set states.
AddHandler UpdateItemStatus, AddressOf CustomContextMenuProvider_UpdateItemStatus
End Sub
private MenuAction setBackgroundToBlueMenuAction;
private MenuAction clearBackgroundMenuAction;
...
// The provider's constructor sets up the MenuAction objects
// and the the MenuGroup which holds them.
public CustomContextMenuProvider()
{
// Set up the MenuAction which sets the control's
// background to Blue.
setBackgroundToBlueMenuAction = new MenuAction("Blue");
setBackgroundToBlueMenuAction.Checkable = true;
setBackgroundToBlueMenuAction.Execute +=
new EventHandler<MenuActionEventArgs>(SetBackgroundToBlue_Execute);
// Set up the MenuAction which sets the control's
// background to its default value.
clearBackgroundMenuAction = new MenuAction("Cleared");
clearBackgroundMenuAction.Checkable = true;
clearBackgroundMenuAction.Execute +=
new EventHandler<MenuActionEventArgs>(ClearBackground_Execute);
// Set up the MenuGroup which holds the MenuAction items.
MenuGroup backgroundFlyoutGroup =
new MenuGroup("SetBackgroundsGroup", "Set Background");
// If HasDropDown is false, the group appears inline,
// instead of as a flyout. Set to true.
backgroundFlyoutGroup.HasDropDown = true;
backgroundFlyoutGroup.Items.Add(setBackgroundToBlueMenuAction);
backgroundFlyoutGroup.Items.Add(clearBackgroundMenuAction);
this.Items.Add(backgroundFlyoutGroup);
// The UpdateItemStatus event is raised immediately before
// this provider shows its tabs, which provides the opportunity
// to set states.
UpdateItemStatus +=
new EventHandler<MenuActionEventArgs>(
CustomContextMenuProvider_UpdateItemStatus);
}
继承层次结构
System.Object
Microsoft.Windows.Design.Interaction.MenuBase
Microsoft.Windows.Design.Interaction.MenuAction
线程安全
此类型的任何公共 static（在 Visual Basic 中为 Shared） 成员都是线程安全的。但不保证所有实例成员都是线程安全的。
另请参见
参考
Microsoft.Windows.Design.Interaction 命名空间
PrimarySelectionContextMenuProvider