`ListView.ItemContainerStyle` 中的`ContextMenu` 命令绑定不起作用

Question

我有一个列表视图，我想根据 ListView 列中的某些值隐藏 ContextMenuItems。我可以通过将 ContextMenu 移动到 ListView.ItemContainerStyle 来实现这一点。现在我的问题是我无法在 MenuItem 上触发命令。这曾经在 ContextMenu 直接设置为 ListView 时有效。

这是我尝试过但失败了的方法。（使用 ElementType、ElementName、直接调用等）。

 <UserControl Name="RootElement" DataContext=.Some Context.....>     
 <ListView ItemsSource="{Binding LicensesView}">
                <ListView.ItemContainerStyle>
                    <Style TargetType="{x:Type ListViewItem}">
                        <Setter Property="ContextMenu">
                            <Setter.Value>
                                <ContextMenu>
                                    <MenuItem Header="Refresh 1" Command="{Binding Path=DataContext.LicenseListRefreshCommand, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" />
                                    <MenuItem Header="Refresg 2" Command="{Binding Path=DataContext.LicenseListRefreshCommand, RelativeSource={RelativeSource AncestorType=Window, Mode=FindAncestor}}"/>
                                    <MenuItem Header="Refresh 3" Command="{Binding Path= DataContext.LicenseListRefreshCommand, ElementName=RootElement}" Visibility="{Binding Path=Aktif,Converter= {StaticResource BoolToVisibility}}"/>
                                    <MenuItem Header="Refresh 4" Command="{Binding LicenseListRefreshCommand}"/>
                                </ContextMenu>
                            </Setter.Value>                           
                        </Setter>
                  </Style>
                </ListView.ItemContainerStyle>
                <ListView.View>
                    <GridView>
                        <GridViewColumn Header="Code" DisplayMemberBinding="{Binding Code}" Width="Auto"/>
                        <GridViewColumn Header="Active" DisplayMemberBinding="{Binding Active}" Width="150" />
                        <GridViewColumn Header="Company" DisplayMemberBinding="{Binding Company}" Width="60" />
                        <GridViewColumn Header="Demo" DisplayMemberBinding="{Binding Demo}" Width="Auto" />
                    </GridView>
                </ListView.View>
            </ListView>
</UserControl>

Answer 1

它不起作用的原因是样式是断开连接的属性，因此它不尊重可视化树。我通过使用绑定代理解决了这个问题，如 this answer 所示。

关键是将 DataContext 引用添加为 StaticResource。

<UserControl Name="RootElement" DataContext=.Some Context.....> 
 <UserControl.Resources>
    <BooleanToVisibilityConverter x:Key="BoolToVisibility" />
    <helper:BindingProxy x:Key="Proxy" Data="{Binding}" />
</UserControl.Resources>    
<ListView ItemsSource="{Binding LicensesView}">
            <ListView.ItemContainerStyle>
                <Style TargetType="{x:Type ListViewItem}">
                    <Setter Property="ContextMenu">
                        <Setter.Value>
                            <ContextMenu>
                                <MenuItem Header="Refresh 1" Command="{Binding Path=Data.LicenseListRefreshCommand, Source={StaticResource Proxy}}" />
                            </ContextMenu>
                        </Setter.Value>                           
                    </Setter>
              </Style>
            </ListView.ItemContainerStyle>
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Code" DisplayMemberBinding="{Binding Code}" Width="Auto"/>
                    <GridViewColumn Header="Active" DisplayMemberBinding="{Binding Active}" Width="150" />
                    <GridViewColumn Header="Company" DisplayMemberBinding="{Binding Company}" Width="60" />
                    <GridViewColumn Header="Demo" DisplayMemberBinding="{Binding Demo}" Width="Auto" />
                </GridView>
            </ListView.View>
        </ListView>

`ListView.ItemContainerStyle` 中的`ContextMenu` 命令绑定不起作用

`ContextMenu` Command binding inside `ListView.ItemContainerStyle` does not work

c#

data-binding

wpf

mvvm

wpf-controls