Does Removing items from SelectedItems source remove them from the ItemsSource?

Question

If I had 2 ObservableCollections<someObject> one represents the ItemsSource and one represents the SelectedItems source.

Does calling the Clear() function on the SelectedItems source remove those items from the ItemsSource?

Answer 1

No it would just affect your SelectedItems collection (by emptying it of course). Clear just removes items from a collection not another one :

• ItemsSource references an ObservableCollection containing object references.
• SelectedItems references another ObservableCollection containing some objects references also contained into your ItemsSources collection;

Calling Clear method on your SelectedItems collection will only removes object references contained in SelectedItems, not objects (themself) or object references from another collection (here ItemsSource).