WPF - Is it possible to negate the result of a data binding expression?

Question

I know this works fine:

<TextBox IsEnabled="{Binding ElementName=myRadioButton, Path=IsChecked}" />

...but what I really want to do is negate the result of the binding expression similar to below (psuedocode). Is this possible?

<TextBox IsEnabled="!{Binding ElementName=myRadioButton, Path=IsChecked}" />

Answer 1

Unfortunately, you cannot directly perform operators, such as negation, on the Binding expression... I would recommend using a ValueConverter to invert the boolean.

Answer 2

You can do this using an IValueConverter:

public class NegatingConverter : IValueConverter
{
  public object Convert(object value, ...)
  {
    return !((bool)value);
  }
}

and use one of these as the Converter of your Binding.