在DataTemplate中绑定ElementName [英] Binding ElementName inside a DataTemplate

问题描述

我正试图绑定一个依赖于控件的属性在同一个 DataTemplate 中。

I am trying to bind a property that is dependent on a control within the same DataTemplate.

说明：

<DataTemplate>
    <StackPanel Orientation="Horizontal">
        <ComboBox x:Name="ComboList"
                  ItemsSource="{Binding StatTypes}"
                  SelectedItem="{Binding SelectedStatType, Mode=TwoWay, FallbackValue='Select a type'}">
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Text}"/>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>

        <TextBox Grid.Column="1" MinWidth="40" Margin="5">
            <TextBox.Text>
                <Binding Path="StatValue">
                    <Binding.Converter>
                        <converter:PercentageConverter SelectedStatType="{Binding ElementName=ComboList, Path=SelectedItem}" />
                    </Binding.Converter>
                </Binding>
            </TextBox.Text>
        </TextBox>
    </StackPanel>
</DataTemplate>

但是 PercentageConverter 中的属性从不通过这一点，我不明白为什么。这是一个命名范围问题吗？如果是这样，我认为这并不重要，因为它是相同的 DataTemplate
如果没有，我做错了什么？

But the property in the PercentageConverter is never set through this and I don't see why. Is this a naming scope issue? If so, I thought this would not matter since it is in the same DataTemplate If not, what am I doing wrong?

推荐答案

这可能是一个namescope问题，绑定不是一个框架元素，它内部的任何对象都不会共享外部名称镜像，也不会在任何树中绑定，所以相关的源绑定也应该失败。

This is probably a namescope issue, the binding is not a framework element, any objects inside it will not share the outside namescope, nor is the binding in any tree, so relative source bindings should fail as well.

您可以尝试使用 x：参考 ，它使用不同的机制：

You can try using x:Reference instead, it uses a different mechanism:

{Binding SelectedItem, Source={x:Reference ComboList}}

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