绑定到DataTemplate中的父DataContext [英] Bind to parent DataContext within DataTemplate

问题描述

我试图将MenuItem的Command绑定到包含在 UserControl.DataContext 中的命令。我找到了几个类似的问题，但根据他们的解决方案是没有给我的：

I'm trying to bind MenuItem's Command to command contained in UserControl.DataContext. I've found couple of similar question, but solution according to them is failing to me:

<UserControl ...>
<UserControl.Resources>
    <DataTemplate x:Key="TileItemStye">
        <Grid Width="100" Height="100">
            <Grid.ContextMenu>
                <ContextMenu>
                    <MenuItem Header="Remove" 
                              Command="{Binding DataContext.RemoveItem, 
                              RelativeSource={RelativeSource FindAncestor,
                                             AncestorType=UserControl}}">
                    </MenuItem>
                </ContextMenu>
            </Grid.ContextMenu>
        </Grid>
    </DataTemplate>
</UserControl.Resources>
<Grid>
    <ListView ItemsSource="{Binding Path=Files}" 
              ItemTemplate="{DynamicResource TileItemStye}"  >
    <ListView.ItemsPanel>
        <ItemsPanelTemplate>
            <WrapPanel />
        </ItemsPanelTemplate>
    </ListView.ItemsPanel>
</ListView>
</Grid>

UserControl的DataContext是ViewModel， code> ICommand RemoveItem和 ObservableCollection< FileViewModel> 文件。

UserControl's DataContext is ViewModel with ICommand RemoveItem and ObservableCollection<FileViewModel> Files.

推荐答案

如果你在.NET 4上确实有一个更优雅的解决方案：

If you are on .NET 4 there indeed is a more elegant solution:

<UserControl Name="uc" ...>
<!-- ... -->
    <MenuItem Header="Remove"
              Command="{Binding DataContext.RemoveItem,
                                Source={x:Reference uc}}"/>

（这要求模板保留在Resources中，否则会有循环依赖错误）

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