什么是 String.Format 的 WPF XAML 数据绑定等效项? [英] What is the WPF XAML Data Binding equivalent of String.Format?

问题描述

或者，更清楚地说，我如何格式化文本块(在我的情况下，包含在工具提示中)，以便文本的某些部分来自绑定值.

Or, to be more clear, how can I format a block of text (in my case, to be included within a tooltip) such that some portions of the text come from bound values.

在普通的 C# 中，我会使用:

In plain C# I would use:

_toolTip.Text = string.Format("{1:#0}% up, {2:#0}% down",
    Environment.NewLine, percentageOne, percentage2);

但是，Text 属性的 WPF XAML 标记似乎只能包含一个绑定.花括号给了我很高的期望，但这是不可能的:

However the WPF XAML markup for a Text property seems able to contain only a single binding. The curly braces gave me high hopes, but this isn't possible:

<Element>
  <Element.Tooltip>
    <!-- This won't compile -->
    <TextBlock Text="{Binding Path=PercentageOne}% up, {Binding Path=PercentageTwo}% down"/>
  </Element.Tooltip>
</Element>

我读到 Run.Text 属性不是依赖属性，因此无法绑定.

I read that the Run.Text property is not a dependency property and can therefore not be bound.

有没有办法在 XAML 中执行这种格式设置?

Is there a way I can perform this formatting in XAML?

推荐答案

可以使用 MultiBinding + StringFormat(需要 WPF 3.5 SP1):

You can use MultiBinding + StringFormat (requires WPF 3.5 SP1):

<TextBox.Text>
    <MultiBinding StringFormat="{}{1:#0}% up, {2:#0}% down">
      <Binding Path="PercentageOne" />
      <Binding Path="PercentageTwo"/>
    </MultiBinding>
</TextBox.Text>

关于 Run.Text - 您无法绑定到它，但有一些解决方法:

Regarding Run.Text - you can't bind to it but there are some workarounds:

• http://fortes.com/2007/03/20/bindablerun/
• http://paulstovell.net/blog/index.php/attached-bindablerun/

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