在WPF中使用多重绑定时是否需要使用转换器?

问题描述

我想知道是否存在不使用转换器就可以使用Multibinding的情况-以及迫使我们使用转换器的局限性.

I would like to know if there are scenarios where you can use a Multibinding without a converter - and the limitations which force us to use a converter.

特别是我正在尝试将一个字符串与另一个以string.format样式的两个字符串绑定.

In particular I am trying to bind a string to another two strings in a string.format style.

推荐答案

在不使用转换器的情况下，使用MultiBinding的最常见区域是当字符串格式连接两个单独的值时

The most common area you use a MultiBinding without a converter is when you have a string format concatenating two individual values

举个例子:

要格式化具有第一"，最后"部分的名称，并且您要根据语言环境对其进行格式化

To format Names that have First, Last part and you want to format it based on locale

<StackPanel>
  <TextBlock x:Name="firstName"
              Text="John" />
  <TextBlock x:Name="lastName"
              Text="Wayne" />
  <TextBlock>
    <TextBlock.Text>
      <MultiBinding StringFormat="{}{0} {1}">
        <Binding ElementName="firstName"
                  Path="Text" />
        <Binding ElementName="lastName"
                  Path="Text" />
      </MultiBinding>
    </TextBlock.Text>
  </TextBlock>
</StackPanel>

您确实看到了很多使用转换器的地方，因为使用MultiBinding与Binding相同，但是您将多个源值格式化为单个结果，而不是单个输入->单个输出.

You do see quite a lot of places you use a converter since using a MultiBinding your doing the same as a Binding but you have multiple source values formatted to a single result instead of single input -> single output.

您可以让Binding接受ConverterParameter来提供另一个输入值，但是您有一些局限性，例如无法为其提供运行时绑定值，这使得MultiBinding更适合要绑定的多个输入全部.

You can have a Binding take a ConverterParameter to supply another input value however you have limitations like not being able to provide a runtime Bound value to it, which makes MultiBinding more appropriate for multiple inputs where you want to bind all of them.

它可以归结为您的用例，如果您想提供基于自定义方式评估的不同输入类型的结果，则需要一个Converter(与Binding非常相似.请考虑一下区别在于1个输入可绑定值，而不是多个)

It boils down to your use-case, If you want to provide a result based on different input types that you evaluate in a custom-way, you need a Converter(pretty much similar to Binding. Just think of the difference as 1 input bind-able value against multiple)

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