为什么这个页面没有使用资源? [英] Why are resources not used in this page?

问题描述

无论我把资源放在哪里，它们的价值都没有被利用:

No matter where I put my resources, their value isn't used:

TextBlock 文本应该呈现为黑色，但始终呈现为白色.

The TextBlock text should be rendered black, but it's always rendered white.

为什么?

<Page
  x:Class="TemplateTest.MainPage"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  mc:Ignorable="d" Background="Lavender">

  <Page.Resources>
    <Style TargetType="TextBlock">
      <Setter Property="Foreground" Value="Black" />
    </Style>
  </Page.Resources>

  <StackPanel>
    <ListView>
      <ListView.HeaderTemplate>
        <DataTemplate>
          <TextBlock>
            <Run>Test</Run>
            <Run>!</Run>
          </TextBlock>
        </DataTemplate>
      </ListView.HeaderTemplate>

      <ListView.ItemTemplate>
        <DataTemplate x:DataType="x:String">
          <TextBlock Text="{x:Bind}"></TextBlock>
        </DataTemplate>
      </ListView.ItemTemplate>

      <x:String>Number 1</x:String>
      <x:String>Number 2</x:String>
      <x:String>Number 3</x:String>
    </ListView>
  </StackPanel>
</Page>

推荐答案

来自 Jim Walker @ https://github.com/MicrosoftDocs/windows-uwp/issues/2790#issuecomment-722065687:

From Jim Walker @ https://github.com/MicrosoftDocs/windows-uwp/issues/2790#issuecomment-722065687 :

TextBlock 与大多数控件的不同之处在于它没有可编辑的模板，因此不幸的是，它不支持轻量级样式.您必须使用 Style 来设置前景.而且，正如我们已经知道的，页面或应用程序级别的隐式样式不会应用于 DataTemplate 中的 TextBlocks，因此您必须使用单独的隐式样式Style 内的 DataTemplate 或 Style 带有更改那些 TextBlock 的键.据我所知，没有办法解决这个问题.

TextBlock is different from most controls in that it doesn't have an editable template, so, unfortunately, it doesn't support lightweight styling. You have to use a Style to set the foreground. And, as we already know, a Page- or App-level implicit style won't be applied to TextBlocks inside a DataTemplate, so you have to use a separate implicit Style inside the DataTemplate or a Style with a key to change those TextBlocks . As far as I know, there isn't any way around this.

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