Question

EntityCollection.ToList().Clear()

Does not clear the entity collection. Any idea why?

Any solution?

How should i clear the EntityCollection?

Answer 1

Because ToList() creates a copy of the EntityCollection as a List<T> and then you just clear that list and not the EntityCollection itself.

Edit 1:
Use the Clear() method from EntityCollection:
http://msdn.microsoft.com/de-de/library/bb302707.aspx

Edit 2:
Oh I see. So it’s this class: http://msdn.microsoft.com/de-de/library/ff422654(v=vs.91).aspx ?
Seems you have to enumerate all items and delete them one by one.

foreach( var item in EntityCollection.ToList() )
    EntityCollection.Remove(item);

Here you need ToList() to create a copy because most of the collection classes don’t like it when you delete items from them during enumeration.