WPF UserControl上下文菜单可见性绑定

Question

我的用户控件上下文菜单可见性无法绑定依赖项属性.任何的想法？

这是我的WPF代码

<UserControl.ContextMenu>
    <ContextMenu Visibility="{Binding ElementName=wellControl, Path=IsInCompactMode, Converter={StaticResource BooleanToVisibilityConverter}}">
    <MenuItem Command="local:GCommands.Edit" />
    <MenuItem Command="local:GCommands.Delete" />
    <MenuItem Command="local:GCommands.ExportFcsFiles" />
    <MenuItem Command="local:GCommands.BatchExportStatistics" />
    <Separator/>
    <MenuItem Command="local:GCommands.SaveAs" Header="Save As..." />
    </ContextMenu>
</UserControl.ContextMenu>

如果我设置Visibility ="Hidden",它将对我有用.像这样:

<ContextMenu Visibility="Hidden"/>

如果使用它,它将无法正常工作

<ContextMenu Visibility="{Binding ElementName=wellControl, Path=IsInCompactMode, Converter={StaticResource BooleanToVisibilityConverter}}">

我很确定Visibility ="{Binding ElementName = wellControl,Path = IsInCompactMode,Converter = {StaticResource BooleanToVisibilityConverter}}"没有问题,因为它适用于其他人.

这是我的依赖属性

public bool IsInCompactMode
        {
            get {return (bool)GetValue(IsInCompactModeProperty); }
            set {SetValue(IsInCompactModeProperty, value); }
        }
        public static readonly DependencyProperty IsInCompactModeProperty =
            DependencyProperty.Register("IsInCompactMode", typeof(bool), typeof(WellControl), new PropertyMetadata(false));

我试过这种方式,似乎它仍然不起作用,这真是太奇怪了!

<ContextMenu x:Name="menu" IsOpen="{Binding ElementName=wellControl, Path=IsInCompactMode}"> 

我真的很困惑,怎么了？"绑定ElementName = wellControl,Path = IsInCompactMode"适用于用户控件的其他部分,只是不适用于奇怪的上下文菜单？它没有成功

Answer 1

1> ContextMenu,Popups,DataGridColumns不是可视树的一部分.所以绑定使用ElementName或RelativeSource不会像那样工作.

2> 如果希望在特定情况下不显示上下文菜单,请使用触发器从视觉本身取消设置上下文菜单.

      <TextBlock Text="ContextMenu is not shown when DataContext.IsShow is false"}">
            <TextBlock.Style>
                <Style TargetType="{x:Type TextBlock}">
                    <Setter Property="ContextMenu"
                            Value="{StaticResource TextBlockContextMenu}" />
                   <Style.Triggers>
                       <DataTrigger Binding="{Binding IsShow}"
                                    Value="False">
                            <Setter Property="ContextMenu"
                                    Value="{x:Null}" />
                       </DataTrigger>   
                   </Style.Triggers>
                </Style>
            </TextBlock.Style>
      </TextBlock>

3>要将这些项附加到可视化树上,以便绑定起作用,我们使用代理元素方法...

绑定datagrid列可见性MVVM

我更喜欢第二步.