如何从ItemsControl.ItemTemplate中绑定到父DataTemplate [英] How to bind to parent DataTemplate from within an ItemsControl.ItemTemplate

问题描述

我有一个容器类型控件，其中包含许多项目。容器控件具有定义的 DataTemplate ，它还包含一个 ItemsControl 与 DataTemplate 。然而，项目需要绑定到容器控件中的东西。下面给出一个简化的例子：

 < DataTemplate DataType ={x：Type ContainerType}> 
 
<！ - 显示容器内容 - > 
 
< ItemsControl ItemsSource ={Binding Items，Mode = OneWay}> 
 
< ItemsControl.ItemTemplate> 
< DataTemplate DataType ={x：Type Item}> 
 
<！ - 显示项目内容 - > 
< ComboBox Text =选择容器级别选项...
 ItemsSource ={这里有什么？/> 
 
< / DataTemplate> 
< /ItemsControl.ItemTemplate> 
 
< / ItemsControl> 
< / DataTemplate> 
  

如何将物品级别的东西绑定到容器级别？

解决方案

您可以使用 RelativeSource 绑定

 < ComboBox ItemsSource ={Binding SomeCollection，
 RelativeSource = {RelativeSource 
 AncestorType = {x：Type local：MyContainerControl}}}/> ; 
  

您用于绑定路径的内容取决于集合所在的位置。如果它位于 MyContainerControl 上的 DependencyProperty 中，则上述绑定工作正常。如果它位于 DataContext MyContainerControl 中，那么您需要将绑定路径设置为 DataContext.SomeCollection

I have a container type control which contains a number of items. The container control has a DataTemplate defined which also contains a ItemsControl with a DataTemplate for the item. The items however need to bind to something from the container control. A simplified example is given below:

<DataTemplate DataType="{x:Type ContainerType}">

    <!-- Display of the container stuff-->

    <ItemsControl ItemsSource="{Binding Items, Mode=OneWay}">

        <ItemsControl.ItemTemplate>
              <DataTemplate DataType="{x:Type Item}">

                  <!-- Display of the item stuff -->
                  <ComboBox Text="Choose a container-level option..."
                            ItemsSource="{WHAT GOES HERE?}"/>

                </DataTemplate>
         </ItemsControl.ItemTemplate>

      </ItemsControl>
</DataTemplate>

How to I bind something at the item level back up to the container level?

解决方案

You can use a RelativeSource binding

<ComboBox ItemsSource="{Binding SomeCollection, 
              RelativeSource={RelativeSource 
                  AncestorType={x:Type local:MyContainerControl}}}"/>

What you use for your binding path depends on where the collection is located. If it is located as a DependencyProperty on MyContainerControl, then the above binding works fine. If it is located in the DataContext of MyContainerControl, then you'll need to set the binding path to DataContext.SomeCollection

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