Silverlight: Should I be using IDataErrorInfo, INotifyDataErrorInfo, or both?

Question

Should I be using IDataErrorInfo, INotifyDataErrorInfo, or both?

If I use both, should I offer the same error in both or should I only offer sync errors from IDataErrorInfo and only async errors from INotifyDataErrorInfo?

Answer 1

If you're working only in Silverlight, you should implement INotifyDataErrorInfo. From the documentation:

In general, new entity classes for Silverlight should implement INotifyDataErrorInfo for the added flexibility instead of implementing IDataErrorInfo.

However, if you want to share code with WPF, IDataErrorInfo is supported in both Silverlight and WPF.