Bind to not

Question

Is there a super quick way to bind to the inverse of a boolean property? Something like this:

<TextBox Text="Some Text" IsEnabled="{Binding !EnableTextBox}" />

I know I can use a DataTrigger, but I was hoping for a nice shorthand.

Answer 1

When I need to do this, I wrote a simple converter:

public class BoolInverterConverter : IValueConverter
{
 #region IValueConverter Members

 public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
 {
  if (value is bool)
  {
   return !(bool)value;
  }
  return value;
 }

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

 #endregion
}

<TextBox Text="Some Text" IsEnabled="{Binding EnableTextBox, Converter={StaticResource BoolInverterConverter}}" />

Or a quicker solution would be just to add another read-only bool property to your VM and negate that value.