public override void Refresh()
{
if (IsAddingNew || IsEditingItem)
{
throw new InvalidOperationException("Cannot refresh while adding or editing an item");
}
if (DeferLevel != 0)
{
return;
}
Groups = null;
RootGroup.ClearItems();
if (ActiveList != SourceCollection)
{
try {
IgnoreFilteredListChanges = true;
filteredList.Clear();
foreach (var item in SourceCollection)
{
AddToFiltered(item, false);
}
if (SortDescriptions.Count > 0)
{
filteredList.Sort(new PropertyComparer(SortDescriptions));
}
} finally {
IgnoreFilteredListChanges = false;
}
if (GroupDescriptions.Count > 0 && filteredList.Count > 0)
{
foreach (var item in filteredList)
{
RootGroup.AddInSubtree(item, Culture, GroupDescriptions, false);
}
Groups = RootGroup.Items;
}
}
IsEmpty = ActiveList.Count == 0;
IsCurrentAfterLast = CurrentPosition == ActiveList.Count || ActiveList.Count == 0;
IsCurrentBeforeFirst = CurrentPosition == -1 || ActiveList.Count == 0;
int index = IndexOf(CurrentItem);
if (index < 0 && CurrentPosition != -1 && !IsEmpty)
{
index = 0;
}
RaiseCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset), false);
MoveCurrentTo(index, true, false);
}
