WPF: how to use 2 converters in 1 binding

bindingconverterswpf

I have a control that I want to show/hide, depending on the value of a boolean.

I have a NegatedBooleanConverter (switches true to false and vice versa) and I need to run this converter first.
I have a BooleanToVisibilityConverter and I need to run this converter after the NegatedBoolConverter.

How can I fix this problem? I want to do this in XAML.

edit: this is a possible solution.

That doesn't seem to work. It first converts the value with the separate converters and then does something with the converted values.

What I need is:

  • Convert the value with the first converter (this gives convertedValue).
  • Convert convertedValue with the second converter and it's this result that I need.

Best Answer

This is what I did:

public class CombiningConverter : IValueConverter
{
    public IValueConverter Converter1 { get; set; }
    public IValueConverter Converter2 { get; set; }

    public object Convert(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        object convertedValue =
            Converter1.Convert(value, targetType, parameter, culture);
        return Converter2.Convert(
            convertedValue, targetType, parameter, culture);
    }

    public object ConvertBack(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

and I call it like this:

<converters:CombiningConverter
    x:Key="negatedBoolToVisibilityConverter"
    Converter1="{StaticResource NegatedBooleanConverter}"
    Converter2="{StaticResource BoolToVisibilityConverter}" />

A MultiValueConverter might also be possible I think. Maybe I'll try that later.

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