MultiBinding with MultiValueConverter does not update

Question

it seems that I have a problem with my multibinding.

Scenario:
I have a window with two datepickers and a listview. The listliew contains some data bound element

Answer 1

After searching for hours, I find a simple and decent answer ! Since ObservableCollection doesn't raise PropertyChanged event but CollectionChanged, we just have to bind the collection's Count to fire the event when the list changes :

Original infos about this perfectly working multibinding here : https://stackoverflow.com/a/10884002/817504