里面一个DataTemplate WPF外地产 [英] Outside Property inside a DataTemplate WPF

问题描述

情景：我有一个列表框和ListBoxItems有一个DataTemplate。我想要做的就是把一个文本菜单中的DataTemplate。美中不足的是，我希望这个文本菜单的ItemsSource为根据窗口的某些属性有所不同。我最初的想法是，我可以在刚才的ItemsSource绑定到属性窗口，然后将返回的ItemsSource;不过，我似乎无法正确地绑定到该属性。我相信这是因为我在DataTemplate中，因此DataContext的（我相信这是正确的字）是一个ListBoxItem，而不是窗口的。 我怎么能得到的ContextMenu这是一个DataTemplate内绑定到一个属性的DataTemplate。

Scenario: I have a ListBox and the ListBoxItems have a DataTemplate. What I want to do is put a ContextMenu in the DataTemplate. The catch is that I want this ContextMenu ItemsSource to be different depending on certain properties in the window. My initial thought is that I could just bind the ItemsSource to a Property in the window and that would return an ItemsSource; however, I cant seem to bind to this property correctly. I believe this is because I am in the DataTemplate and consequently the DataContext (I believe that is the right word) is of that ListBoxItem and not of the window. How could I get the ContextMenu that is inside a DataTemplate to bind to a Property outside of the DataTemplate.

推荐答案

您可以通过使用的RelativeSource FindAncestor语法获得的DataContext从窗口

You can get the DataContext from your window by using the RelativeSource FindAncestor syntax

<DataTemplate>
  <TextBlock Text="{Binding MyInfo}">
    <TextBlock.ContextMenu>
      <Menu ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.MyContextMenuItems}"/>
    </TextBlock.ContextMenu>
  </TextBlock>
</DataTemplate>

不能完全确定，但结合是正确的？ 如果您的DataContext是另一个对象的类型，你只需要改变AncestorType（例如，通过用户控件）。

Not totally sure, but the binding is correct... If your DataContext is on another object type, you just have to change the AncestorType (eg. by UserControl).

这篇关于里面一个DataTemplate WPF外地产的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！