You can’t do that in WPF?

One of the things that virtually everyone talks about whenever they start learning WPF is how amazing the experience is – there are virtually no limits to the amazing stuff you can do. Or put in a different way; The hard becomes easy, the impossible becomes possible.

However, one thing I have not found a way to do (and which is apparently not currently possible, according to the answer I got on StackOverflow.com), is how to handle databinding in the case where you want to bind to an interface, and not the actual object.

In my case, I have a list of business objects that represent the ItemsSource for a ListBox. Each of these objects contains two other objects. These objects can be one of several different types, the only thing they have in common is that they implement a specific interface. The problem here is that the ItemTemplate I use cannot refer to the Interface properties – the binding engine will only see the object as the type it really is, not the interface.

While this isn’t a HUGE thing, it is a weakness that would be very nice to be able to work around in an upcoming update of WPF.