在 XAML 中指定数据上下文会阻止数据触发器工作

发布于 2024-09-24 15:02:52 字数 1000 浏览 4 评论 0原文

我有一个 DataTrigger 设置，如下所示：

<UserControl.Resources>
    <Style x:Key="resultTypeStyle">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Result, Path=Result.Type}" Value="Confirmation">
                <Setter Property="Control.Visibility" Value="Collapsed" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</UserControl.Resources>

以及两个使用它的控件：

    <TextBlock Style="{StaticResource resultTypeStyle}" FontSize="14" Grid.Row="2">Condition</TextBlock>
    <myns:ConditionBuilderView Style="{StaticResource resultTypeStyle}" DataContext="{Binding Condition}" Grid.Row="3"/>

结果类型由组合框更改。

当结果类型为“Confirmation”时，TextBox 消失，但 ConditionBuilderView 保持可见除非我从其中删除 DataContext 属性它。

我需要设置 DataContext 属性，以便控件获取正确的数据。

设置数据上下文意味着可见性属性不再起作用？

原文

I have a DataTrigger setup like so:

<UserControl.Resources>
    <Style x:Key="resultTypeStyle">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Result, Path=Result.Type}" Value="Confirmation">
                <Setter Property="Control.Visibility" Value="Collapsed" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</UserControl.Resources>

And two controls that use it:

    <TextBlock Style="{StaticResource resultTypeStyle}" FontSize="14" Grid.Row="2">Condition</TextBlock>
    <myns:ConditionBuilderView Style="{StaticResource resultTypeStyle}" DataContext="{Binding Condition}" Grid.Row="3"/>

The result type is changed by a combo box.

When the result type is Confirmation then the TextBox disappears but the ConditionBuilderView stays visible unless I remove the DataContext attribute from it.

I need to set the DataContext attribute so that the control gets the right data.

What does setting the data context do that means the visibility property no longer works?

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流云如水 2024-10-01 15:02:52

您实际上正在更改 ConditionBuilderView 样式中用于绑定的上下文。因此，您的 DataTrigger 在绑定条件上查找 Result.Path。如果它只是关于可见性，这应该有效：

<TextBlock Style="{StaticResource resultTypeStyle}" FontSize="14" Grid.Row="2">Condition</TextBlock>
<ContentControl Grid.Row="3" Style="{StaticResource resultTypeStyle}" >
    <myns:ConditionBuilderView DataContext="{Binding Condition}"/>
</ContentControl>

You are actually changing the context used for the binding in the style of the ConditionBuilderView. So your DataTrigger looks for Result.Path on the bound Condition. If its just about Visibility this should work:

<TextBlock Style="{StaticResource resultTypeStyle}" FontSize="14" Grid.Row="2">Condition</TextBlock>
<ContentControl Grid.Row="3" Style="{StaticResource resultTypeStyle}" >
    <myns:ConditionBuilderView DataContext="{Binding Condition}"/>
</ContentControl>

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