使用绑定作为ConverterParameter [英] Use Binding as ConverterParameter

问题描述

我正尝试使用值绑定作为转换器参数，如下面的代码片段所示:

I'm trying to use a value binding as converter parameter as shown in the code snippet below:

<Element
  Attribute="{Binding Value,
              Converter={StaticResource EqualityConverter},
              ConverterParameter={Binding CompareTo}}" />

问题在于，调用EqualityConverter::Convert()方法时将Binding的实例作为转换器参数(CompareTo)，而不是绑定的具体值.

The problem is, that the EqualityConverter::Convert() method is called with an instance of Binding as converter parameter (CompareTo) rather than the concrete value of the binding.

是否有更聪明的解决方法?我显然可以在视图模型中提供转换后的属性，但是我想知道是否有与上述解决方案相似的工作解决方案.

Is there a smarter way to solve it? I could obviously provide the converted property in my view model, but I would like to know if there is a similar working solution to the above one.

推荐答案

ConverterParameter不是依赖项属性，因此您将无法绑定任何属性.但是，您可以尝试将MultiBinding与MultiValueConverter结合使用.

ConverterParameter is not a Dependency Property, hence you won't be able to bind any property. However, you can try using MultiBinding with MultiValueConverter.

代码:

<TextBox>
    <TextBox.Text>
        <MultiBinding Converter="{StaticResource MultiValueConverter}">
            <Binding Path="property1"/>
            <Binding Path="property2"/>
        </MultiBinding>
    </TextBox.Text>
</TextBox>

public class MultiValueConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, 
           object parameter, System.Globalization.CultureInfo culture)
    {
         property1 = values[0];
         property2 = values[1];
         // Do your logic with the properties here.
    }
    public object[] ConvertBack(object value, Type[] targetTypes, 
           object parameter, System.Globalization.CultureInfo culture)
    {

    }
}

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