问题:

I realized that appears this interface in .NET Framework 4.5

I was looking first for about how to implemented in Silverlight (I can imagine that it's implemented in the same way), but I can't find a compact demo of this new interface. Is it possible to show how can I use it?

I really want to find a small demo to understand it

回答1:

Beside the very detailed description on MSDN about the Silverlight version of INotifyDataErrorInfo

There are already some blog posts with samples how to use/implement it in WPF 4.5:

WPF 4.5 – Asynchronous validation
WPF 4.5 – Part 1 : Asynchronous data validation (the author has a nice series about the new fetaures in WPF 4.5)

回答2:

The PRISM library has a very good example implementation in the MVVM RI sample, the class named DomainObject implements both INotifyPropertyChanged and INotifyDataErrorInfo.

It is a SL version but it now compiles with .NET 4.5