命令绑定不工作？ [英] commandbinding not working?

问题描述

我正在使用多标签应用程序（例如：多标签文本编辑器），其中每个标签项都有自己的内容。在tabitem的上下文菜单中，他们是一个命令的菜单，说SelectAll命令。

运行应用程序后，菜单项始终禁用，不执行命令。

那么，我如何让我的命令绑定工作？

CODE ::

在上下文菜单中TextEditor>

 < MenuItem Command =local：TextEditor.SelectAllCommand Header =全选/> 
  

在CommandBindings中TextEditor>

 < UserControl.CommandBindings> 
< CommandBinding Command =local：TextEditor.SelectAllCommand
 Executed =SelectAll_ExecutedCanExecute =SelectAll_CanExecute/> 
< /UserControl.CommandBindings> 
 

带有TextEditor的TabItems是在运行时创建的

使用像这样

这是因为ContextMenus是具有自己的VisualTree和LogicalTree的独立窗口。

 < MenuItem Header =CutCommand =CutCommandTarget =
 {Binding Path = PlacementTarget，
 RelativeSource = {RelativeSource FindAncestor，
 AncestorType = {x：Type ContextMenu}}}/> 
  

如需更多信息，请查看以下链接

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

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.

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

So, how can i make my commandbindings work ?

CODE ::

In Context Menu At TextEditor>

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

In CommandBindings At TextEditor>

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

The TabItems with TextEditor are created at run time

解决方案

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

Use like this

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

For more check the link below

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

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