Question

我有以下情况：

<DataTemplate DataType="{x:Type tra:Presenter}">
        <DockPanel>
            <GroupBox>

                    <ie:DifferentControl DataContext="{Binding LocationSelectorPresenter}" 
                    Visibility="{Binding PropertyOnTraPresenter, Converter={StaticResource boolToVis}}"/>

            </GroupBox>
        </DockPanel>
    </DataTemplate>

如何从具有自己的DataContext的东西访问DataTemplate数据类型的属性？

我尝试使用FindAncestor如下，但没有运气。（这来自this similar question，但我认为我错过了一些东西。）

Path=PropertyOnTraPresenter, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type tra:Presenter}}

我认为FindAncestor在这里是错误的方法，因为DataTemplate似乎不在祖先的列表中。

System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried StackPanel (hash=61829898)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried ContentPresenter (hash=51997850)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried Grid (hash=51537092)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried GroupBox (hash=32646025)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried DockPanel (hash=63418642)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried ContentPresenter (hash=50027503)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried ContentPresenter (hash=37861722)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried AdornerDecorator (hash=8826739)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried Border (hash=26352004)
System.Windows.Data Warning: 73 :     Lookup ancestor of type tra:Presenter:  queried SimplifierDialog (hash=6690366)
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor.......

我也看了this question，这似乎是我反过来的问题，但我无法使解决方案适合，因为似乎不可能给DataTemplate {{1 }}

Answer 1

我发现可以从任何祖先访问datacontext - 而不仅仅是声明它的DataTemplate。我想这可能归结于我对DataTemplate如何工作的误解。

这完成了这项工作：

"{Binding DataContext.PropertyOnTraPresenter, 
RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type GroupBox}}, 
Converter={StaticResource boolToVis}}"

WPF：从DataContext访问父DataTemplate

1 个答案: