Best practice when not implementing IValueConvert.ConvertBack

Question

Just wondering what people think is the best practice when implementing an IValueConverter which does not have a meaningfull ConvertBack implementation (or one that is only

Answer 1

The documentation for IValueConverter.ConvertBack recommends returning DependencyProperty.UnsetValue.

The data binding engine does not catch exceptions that are thrown by a user-supplied converter. Any exception that is thrown by the ConvertBack method, or any uncaught exceptions that are thrown by methods that the ConvertBack method calls, are treated as run-time errors. Handle anticipated problems by returning DependencyProperty.UnsetValue.