The reason Refresh sometimes doesn't work is because of this code being used on the ItemsCollection:
/// <summary>
/// Set/get a filter callback to filter out items in collection.
/// This property will always accept a filter, but the collection view for the
/// underlying ItemsSource may not actually support filtering.
/// Please check <seealso cref="CanFilter"/>
/// </summary>
/// <exception cref="NotSupportedException">
/// Collections assigned to ItemsSource may not support filtering and could throw a NotSupportedException.
/// Use <seealso cref="CanFilter"/> property to test if filtering is supported before assigning
/// a non-null Filter value.
/// </exception>
public override Predicate<object> Filter
{
get
{
return (EnsureCollectionView()) ? _collectionView.Filter : MyFilter;
}
set
{
MyFilter = value;
if (_collectionView != null)
_collectionView.Filter = value;
}
}
The filter is getting set on the underlying collection view, rather than the ItemsCollection itself.
And then the base Refresh method doesn't actually call do anything to _collectionView
, so refresh does nothing!
/// <summary>
/// Re-create the view, using any <seealso cref="SortDescriptions"/> and/or <seealso cref="Filter"/>.
/// </summary>
public virtual void Refresh()
{
IEditableCollectionView ecv = this as IEditableCollectionView;
if (ecv != null && (ecv.IsAddingNew || ecv.IsEditingItem))
throw new InvalidOperationException(SR.Get(SRID.MemberNotAllowedDuringAddOrEdit, "Refresh"));
RefreshInternal();
}
Sorry to respond to old question, but felt it was worth clarifying.