Shared interfaces for BusinessListBase<T, C> and BusinessBindingListBase<T, C>

[michaelcsikos]

I have a ViewModelListBase class which I want to work with either BusinessListBase<T, C> or BusinessBindingListBase<T, C>. I found it difficult to find the right common interfaces to do simple things like AddNew(). Currently, I have the following:

C   child       = default(C);

var bindingList = Model as IBindingList;

if (bindingList != null)
    child = (C)bindingList.AddNew();
else
{
    var observableBindingList = Model as IObservableBindingList;

    if (observableBindingList != null)
        child = (C)observableBindingList.AddNew();
}

BusinessBindingListBase<T, C> doesn't implement IBusinessListBase<C>. IEditableCollection wasn't much help. BusinessListBase<T, C> implements IObservableBindingList which sounded promising, but it's got nothing to do with IBindingList which BusinessBindingListBase<T, C> implements.

[rockfordlhotka]

If anyone comes up with a good solution I'd love to see it. Many years ago (2007?) I remember trying to reconcile the two collection types and never came up with something that would work in Windows Forms, WPF, and (at the time) Silverlight.