In .NET Framework, ObservableList.CreateView does not update with new items when they are added to the ObservableList.

[xkz1994]

same code:

var view = observableList.CreateView(x => x);
ItemsView = view.ToNotifyCollectionChanged(SynchronizationContextCollectionEventDispatcher.Current);

observableList.AddRange(new[] { 1, 2, 3, 4, 5 });

framework:

core:

[xkz1994]

        public static void InsertRange<T>(this List<T> list, int index, ReadOnlySpan<T> source)
        {
            if (!source.IsEmpty)
            {
                ref var view = ref Unsafe.As<List<T>, CollectionsMarshal.ListView<T>>(ref list!);

                if (view._items.Length - view._size < source.Length)
                {
                    Grow(ref view, checked(view._size + source.Length));
                }

                if (index < view._size)
                {
                    Array.Copy(view._items, index, view._items, index + source.Length, view._size - index);
                }

                source.CopyTo(view._items.AsSpan(index));
                view._size += source.Length;
                view._version++;
            }
        }

This code does not work properly in .NET Framework 4.8.