列表框 DataTemplate 中 TextBlock 的条件格式 [英] Conditional formating of a TextBlock within a Listbox’s DataTemplate

问题描述

这是我的第一个 wcf &我遇到了一些看似基本的 XAML 概念的问题.

It’s my first wcf & I’m running into some trouble with what seems to be a basic XAML concept.

不知何故，PriorityStyle"中的数据触发器/绑定不起作用.我想这是因为上下文问题，但环顾四周，我没有设法找到答案.

Somehow the DataTrigger / Binding in the "PriorityStyle" is not working. I guess this is because of a context issue but looking around I haven’t manage to find the answers.

<UserControl … >

<UserControl.Resources>

    <Style x:Key="PriorityStyle" TargetType="TextBlock" >
        <Style.Triggers>
            <DataTrigger Binding="{Binding Priority}" Value="High">
                <Setter Property="Foreground" Value="Red"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>

    <DataTemplate x:Key="ItemTemplate">
        <StackPanel Margin="3">
            ...
            <DockPanel>
                <TextBlock Name="Priority" Text="{Binding Priority}" Foreground ="#014f7c" Style="{StaticResource PriorityStyle}"/>
            </DockPanel>
        </StackPanel>
    </DataTemplate>

    <DataTemplate x:Key="SelectedTemplate">
        ...
    </DataTemplate>

    <Style TargetType="{x:Type ListBoxItem}" x:Key="ContainerStyle">
        <Setter Property="ContentTemplate" Value="{StaticResource ItemTemplate}" />
        <Style.Triggers>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="ContentTemplate" Value="{StaticResource SelectedTemplate}" />
            </Trigger>

            <!-- DataBinding work in this Context, But in Style I cannot use a TargetName -->
            <DataTrigger Binding="{Binding Priority}" Value="High">
                <Setter Property="Background" Value="DarkOrange"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>

</UserControl.Resources>

<ListBox x:Name="ListBox" ItemContainerStyle="{StaticResource ContainerStyle}" />

推荐答案

as @HighCore 提到不确定您在何处设置 ListBox 的 Source，但前提是您的绑定在 的样式中有效>ListBoxItem 你可以试试变通办法

as @HighCore mentioned not sure where your setting the Source for your ListBox, but provided your binding works in the Style for ListBoxItem you can try a work-around

<Style x:Key="PriorityStyle" TargetType="TextBlock" >
    <Setter Property="Foreground"
          Value="Black" />
    <Style.Triggers>
        <DataTrigger Binding="{Binding DataContext.Priority, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}}" Value="High">
            <Setter Property="Foreground" Value="Red"/>
        </DataTrigger>
    </Style.Triggers>
</Style>

但您也将 Priority 属性绑定到 TextBlock 中的 Text 和 PriorityStyle.所以你也可以这样做:

but your also binding Priority property to Text in the TextBlock with PriorityStyle anyways. So you could also just do:

<Style x:Key="PriorityStyle"
       TargetType="TextBlock">
  <Setter Property="Foreground"
          Value="Black" />
  <Style.Triggers>
    <Trigger Property="Text"
             Value="High">
      <Setter Property="Foreground"
              Value="Red" />
    </Trigger>
  </Style.Triggers>
</Style>

这样你甚至不需要遍历元素树的绑定

this way you don't even need a binding traversing through your element tree

这篇关于列表框 DataTemplate 中 TextBlock 的条件格式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！