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Asked: 2026-05-10T21:05:10+00:00

Just wondering what people think is the best practice when implementing an IValueConverter which

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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 to be used as OneWay)?

Should it throw (and in that case what exception), return null or return some default value.

Thoughts?

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  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.

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