将ContextMenu属性绑定到所有者属性

Question

我将上下文菜单绑定到文本框的附加属性时遇到问题.所以我有TextBox,右键单击它有一个上下文菜单.那么如何将上下文菜单的属性绑定到WPF XAML中TextBox的附加属性？在这里,我尝试绑定到TextBox但它没有帮助

 <Style x:Key="DefaultTextBox" TargetType="{x:Type TextBox}">
        <Setter Property="BorderBrush" Value="{DynamicResource ThemeSecondary}"/>
        <Setter Property="VerticalContentAlignment" Value="Stretch"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="ContextMenu">
            <Setter.Value>
                <ContextMenu x:Name="uiContexMenu">
                    <ContextMenu.ItemsSource>
                        <CompositeCollection>
                            <MenuItem Command="Cut" Header="Cut">
                                <MenuItem.Icon>
                                    <Viewbox Width="16" Height="16">
                                        <TextBlock FontFamily="{DynamicResource IconFont}" Text="?"/>
                                    </Viewbox>
                                </MenuItem.Icon>
                            </MenuItem>
                            <MenuItem Command="Copy" Header="Copy">
                                <MenuItem.Icon>
                                    <Viewbox Width="16" Height="16">
                                        <TextBlock FontFamily="{DynamicResource IconFont}" Text="?"/>
                                    </Viewbox>
                                </MenuItem.Icon>
                            </MenuItem>
                            <MenuItem Command="Paste" Header="Paste">
                                <MenuItem.Icon>
                                    <Viewbox Width="16" Height="16">
                                        <TextBlock FontFamily="{DynamicResource IconFont}" Text="?"/>
                                    </Viewbox>
                                </MenuItem.Icon>
                            </MenuItem>
                            <CollectionContainer Collection="{Binding  RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=TextBox}, Path=Extensions.ExtendCommands}"/>
                        </CompositeCollection>
                    </ContextMenu.ItemsSource>
                </ContextMenu>
            </Setter.Value>
        </Setter>

我的附属物:

 #region ExtendCommands dependency property

        public static IEnumerable GetExtendCommands(DependencyObject obj)
        {
            return (IEnumerable)obj.GetValue(ExtendCommandsProperty);
        }

        public static void SetExtendCommands(DependencyObject obj, IEnumerable value)
        {
            obj.SetValue(ExtendCommandsProperty, value);
        }

        // Using a DependencyProperty as the backing store for ExtendCommands.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ExtendCommandsProperty =
            DependencyProperty.RegisterAttached("ExtendCommands", typeof(IEnumerable), typeof(Extensions), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.Inherits));

        #endregion

谢谢

Answer 1

这是 ContextMenu 的一个普遍问题，因为它并不总是具有假定父级的数据上下文。有关继承上下文的更多信息，请阅读https://blogs.msdn.microsoft.com/nickkramer/2006/08/17/whats-an-inheritance-context/

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正如该博客文章的评论中所提到的，您可能需要将上下文菜单的数据上下文显式设置为文本框。

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