WPF：从 DataContext 访问父 DataTemplate

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 的对象访问 DataTemplate 数据类型的属性？

我尝试使用 FindAncestor 如下，但没有成功。（这来自 this similar question，但我想我遗漏了什么。）

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

我认为 FindAncestor 是错误的方法，因为 DataTemplate 似乎不在考虑的祖先列表中。

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.......

我也看过 this question，这似乎是我的问题，但我无法使那里的解决方案合适，因为似乎不可能给 DataTemplate x:Name.

Answer 1

我发现 datacontext 可以从任何祖先访问 - 而不仅仅是它在其中声明的 DataTemplate。我认为这可能是我对 DataTemplate 工作原理的误解。

这完成了工作：

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

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