IDataErrorInfo.Error usage?

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Jim Hudson - 11 Mar 2008 13:51 GMT

I recently started using the .Net 3.5 validation facilities (IDataErrorInfo
and ValidatesOnDataErrors) in my C# application, and I find that they work
great. I've now run into a situation where I want to have a XAML control
check IDataErrorInfo.Error, instead of IDataErrorInfo.Item.

Basically, I'd like to know of a Binding property that will trigger the
testing of IDataErrorInfo.Error, in the way that ValidatesOnDataErrors causes
the testing of IDataErrorInfo.Item.

I've read Karl Shifflett's "WPF Business Application Series" at CodeProject,
and Josh Smith's blog and Sacha Barber's blog, and they show how to set up a
data binding to IDataErrorInfo.Error, treating it like any other property. I
can set that up (via INotifyPropertyChanged), but ValidatesOnDataErrors is
just SOOOO easy. Is there a Binding property, like ValidatesOnDataErrors,
that will do it for me?

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Jim Hudson

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Linda Liu[MSFT] - 12 Mar 2008 11:11 GMT

Hi Jim,

Setting the ValidatesOnDataErrors property of the Binding class only tests
of the IDataErrorInfo.Item and not of the IDataErrorInfo.Error.

The Binding class doesn't provide a property to check the
IDataErrorInfo.Error as the ValidatesOnDataErrors property to check the
IDataErrorInfo.Item so far.

To get what yo want, we have to set up a data binding to the
IDataError.Error as you have mentioned.

If you have any concern, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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Jim Hudson - 12 Mar 2008 13:28 GMT

Thanks for th info, Linda. Would you please mention this to the WPF
development team? I think that it would be a nice enhancement.

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Jim Hudson

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Linda Liu[MSFT] - 13 Mar 2008 04:36 GMT

Hi Jim,

Thank you for your prompt response!

I will make a suggestion to our product team about this issue and you can
also make a suggestion in the Microsoft Connect web site by yourself as
follows:

http://connect.microsoft.com/VisualStudio/Feedback

Thank you for your contribution to the production of Microsoft and we
believe that our product will become better and better with the help of you!

Sincerely,
Linda Liu
Microsoft Online Community Support

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IDataErrorInfo.Error usage?

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