命令绑定不起作用? [英] commandbinding not working?

问题描述

我正在开发一个多选项卡应用程序(例如:多选项卡文本编辑器)，其中每个 tabitem 都有自己的内容.在 tabitem 的 contextmenu 中，它们是带有命令的 menuitem，比如 SelectAll 命令.

I working on a multi-tab application (For Ex: Multi-Tab Text Editor), where each tabitem has its own content. And in contextmenu of tabitem, their is menuitem with a command, say SelectAll command.

运行应用程序后，菜单项始终处于禁用状态，不执行任何命令.

After running app, the menu item is always disabled, no command execution is done.

那么，我怎样才能使我的命令绑定工作?

So, how can i make my commandbindings work ?

代码::

在 TextEditor 的上下文菜单中>

In Context Menu At TextEditor>

<MenuItem Command="local:TextEditor.SelectAllCommand" Header="Select All" />

在 TextEditor 的 CommandBindings 中>

In CommandBindings At TextEditor>

<UserControl.CommandBindings>
  <CommandBinding Command="local:TextEditor.SelectAllCommand" 
                  Executed="SelectAll_Executed" CanExecute="SelectAll_CanExecute" />
</UserControl.CommandBindings>

带有 TextEditor 的 TabItems 是在运行时创建的

The TabItems with TextEditor are created at run time

推荐答案

发生这种情况是因为 ContextMenus 是具有自己的 VisualTree 和 LogicalTree 的独立窗口.

This happens since the ContextMenus are separate windows with their own VisualTree and LogicalTree.

这样使用

<MenuItem Header="Cut" Command="Cut" CommandTarget="
          {Binding Path=PlacementTarget, 
          RelativeSource={RelativeSource FindAncestor, 
          AncestorType={x:Type ContextMenu}}}"/>

更多内容请点击下方链接

For more check the link below

http://www.wpftutorial.net/RoutedCommandsInContextMenu.html

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