如何在子元素中绑定属性？

Question

我想使用两个属性值来定义元素是否启用。到目前为止，以下行决定启用/禁用一个元素。 IsEnabled 决定于绑定到 someContext.SomeObject.Count

<ToggleButton Style="{StaticResource CheckButtonStyle}" Margin="1"
              IsChecked="{Binding Path=someContext[3], ElementName=MyElementName, IsAsync=True}"
              IsEnabled="{Binding Path=someContext.SomeObject.Count, ElementName=MyElementName, Converter={StaticResource MyConverter}, ConverterParameter=3}" />

我将转换器更改为 IMultiValueConverter 并且我将 XAML 更改为以下内容：

<ToggleButton Style="{StaticResource CheckButtonStyle}" Margin="1"
              IsChecked="{Binding Path=someContext[3], 
              ElementName=MyElementName, IsAsync=True}">
   <ToggleButton.IsEnabled>
      <MultiBinding Converter="{StaticResource MyMultiValueConverter}" ConverterParameter="3">
         <Binding Path="{someContext.SomeObject.Count}"/>
         <Binding Path="{IsConditionFullfilled}/>
      </MultiBinding>
   </ToggleButton.IsEnabled>
</ToggleButton>

然而，在第一个版本中，大括号内的绑定被识别，但在第二个版本中我得到：

"The type 'someContext' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been build."

我认为 <ToggleButton.IsEnabled></ToggleButton.IsEnabled> 无法访问与其父级相同的命名空间 <ToggleButton />

我该如何解决？

Answer 1

去掉名字两边的大括号，否则会被解释为markup extensions.

When used to provide an attribute value, the syntax that distinguishes a markup extension sequence to a XAML processor is the presence of the opening and closing curly braces ({ and }). The type of markup extension is then identified by the string token immediately following the opening curly brace.

此外，如果仍然需要，请从原始绑定中添加 ElementName。

<MultiBinding Converter="{StaticResource MyMultiValueConverter}" ConverterParameter="3">
   <Binding Path="someContext.SomeObject.Count" ElementName="MyElementName"/>
   <Binding Path="IsConditionFullfilled"/>
</MultiBinding>

如何在子元素中绑定属性？

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