Passing state of WPF ValidationRule to View Model in MVVM

Question

I am stuck in a seemingly common requirement. I have a WPF Prism (for MVVM) application. My model implements the IDataErrorInfo for validation. The

Answer 1

Someone's solved it here (unfortunately its in VB) by creating a dependency property HasError in the VM which seems to be bound to the Validation.HasError. I don't completely understand it yet but it may help you:

http://wpfglue.wordpress.com/2009/12/03/forwarding-the-result-of-wpf-validation-in-mvvm/