它无法关闭ContextMenu中的MenuItem [英] It does not work off MenuItem in ContextMenu

问题描述

它无法关闭ContextMenu中的MenuItem.

将其绑定到ListView.如果未选择ListVIew中的元素，则IsEnabled MenuItem应该能够为false.

It does not work off MenuItem in ContextMenu.

Bind it to the ListView. If an element in ListVIew not selected, IsEnabled a MenuItem should be able to false.

<Window.Resources>
     <ContextMenu x:Key="CategoryiesTaskMenu">
         <MenuItem Header="Add Category"/>
            <MenuItem Header="Edit Category">
                 <MenuItem.Style>
                    <Style TargetType="{x:Type MenuItem}">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding ElementName=listView, Path=SelectedIndex}" Value="-1">
                                <Setter Property="IsEnabled" Value="False"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </MenuItem.Style>
            </MenuItem>
      </ContextMenu>
</Window.Resources>

<ListView Name="listViewTask" ContextMenu="{DynamicResource CategoryiesTaskMenu}">

推荐答案

好吧，您的元素名称为ListViewTask，而触发器使用的是listView.

Well, your element name is ListViewTask, and your trigger is using listView.

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