Assembly: System (in System.dll)
The .NET Framework implementation of NotifyCollectionChangedAction defined an additional member value Move. Windows Phone does not support this value. Moving a collection item should be reported through the actions that initiated the move, which are typically calls to Remove and Add in sequence. (Most collection classes or interfaces do not define an explicit "Move" API.)
Reporting is discretionary. You should report in cases where the number of individual / / actions necessary to properly report changes in a collection becomes excessive. For example, you should report if a list was completely re-ordered based on some operation such as sorting.