This makes me feel like I am missing some major idea about how interfaces work in .NET...why can't I directly access the members of the IDataErrorInfo interface on an entity? When I try something like:

MsgBox(myEntity.Error)

I get a compile error. But if I do:

MsgBox(CType(myEntity, IDataErrorInfo).Error)

it works fine...IDataErrorInfo is implemented in EntityBase2, so what am I missing?

It's because the code uses Explicit interface implementation.

daelmo wrote:

It's because the code uses Explicit interface implementation.

Right...I'm more of a VB.NET guy, so I'm not used to this.

For those out there using WPF and are trying and failing to display entity.Error (or any other explicitly implemented interface field) using XAML PropertyPath binding, here is some guidance:

http://leecampbell.blogspot.com/2008/09/generic-binding-in-wpf-through-explicit.html and http://groups.google.com/group/wpf-disciples/browse_thread/thread/57445c850a8a215f/cc65a29c9ab8ec44?show_docid=cc65a29c9ab8ec44&fwc=2&pli=1