WPF: Display a bool value as “Yes” / “No”

Question

I have a bool value that I need to display as \"Yes\" or \"No\" in a TextBlock. I am trying to do this with a StringFormat, but my StringFormat is ignored and the TextBlock

Answer 1

This is a solution using a Converter and the ConverterParameter which allows you to easily define different strings for different Bindings:

public class BoolToStringConverter : IValueConverter
{
    public char Separator { get; set; } = ';';

    public object Convert(object value, Type targetType, object parameter,
                          CultureInfo culture)
    {
        var strings = ((string)parameter).Split(Separator);
        var trueString = strings[0];
        var falseString = strings[1];

        var boolValue = (bool)value;
        if (boolValue == true)
        {
            return trueString;
        }
        else
        {
            return falseString;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter,
                              CultureInfo culture)
    {
        var strings = ((string)parameter).Split(Separator);
        var trueString = strings[0];
        var falseString = strings[1];

        var stringValue = (string)value;
        if (stringValue == trueString)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

Define the Converter like this:

And use it like this:

If you need a different separator than ; (for example .), define the Converter like this instead: