WPF 样式设置器中的多个 Run 元素 [英] Multiple Run elements in WPF Style setter

问题描述

是否可以在 XAML 中在 Style setter 中定义多个 Run?

Is it possible in XAML to define multiple Run's inside a Style setter?

以下定义了两个 Run 并失败:

The following has two Run's defined and fails:

属性Value"设置了不止一次.

The property 'Value' is set more than once.

<TextBlock>
    <TextBlock.Style>
         <Style TargetType="{x:Type TextBlock}">
              <Setter Property="Text">
                   <Setter.Value>
                       <Run Text="{Binding SelectedItem.iso}"/>
                       <Run Text="{Binding SelectedItem.value}"/>
                  </Setter.Value>
              </Setter>
             <Style.Triggers>
                 <DataTrigger Binding="{Binding SelectedItem.type}" Value={x:Null}">
                      <Setter Property="Text" Value="No value" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

可以在保留使用多个 Run 的同时修复这个问题吗?

Can this be fixed while preserving the usage of multiple Run's?

推荐答案

Setter 作用于一个属性，所以它只能有一个值，你得到的错误是合乎逻辑的:它无法理解你在尝试什么要做到这一点，它可以只是...将一个属性设置为给定的值.

A Setter works on one property, so it can have only one value, the error you get is logical: it has no way of understanding what you're trying to do, it can just... set a property to a given value.

所以这个想法是给它这个值，因为它应该是:附加文本.为此，您可以使用 MultiBinding，它接受多个值并将它们作为一个返回，具体取决于 StringFormat 你给它:

So the idea is to give it this value as it should be: appended texts. To do so, you would use MultiBinding, which takes multiple values and returns them as one, depending on the StringFormat you give it:

<Setter.Value>
    <MultiBinding StringFormat="{}{0}{1}{2}"><!-- Format as you wish -->
        <Binding Path="SelectedItem.iso"/>
        <Binding Source="{x:Static System:Environment.NewLine}"/>
        <Binding Path="SelectedItem.value"/>
    </MultiBinding>
</Setter.Value>

关于 StringFormat 的注意事项:您必须在开始时使用 {} 来转义大括号，否则它会将它们视为标记扩展启动器.

Note on StringFormat: You have to use {} at start to escape braces, else it would consider them as markup extension starters.

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