Returns the row collection as IEnumerable. i.e. All rows that are not DataGridGroupRow: AsEnumerable((r) => !(r is DataGridGroupRow), null); i.e. All currently rows being shown (include group children of visible groups): AsEnumerable(null, (g) => g.GroupRowsVisibility == Visibility.Visible)

'Declaration
 
Public Function AsEnumerable( _
   ByVal predicate As Predicate(Of DataGridRow), _
   ByVal recursionPredicate As Predicate(Of DataGridGroupRow) _
) As IEnumerable(Of DataGridRow)

public IEnumerable<DataGridRow> AsEnumerable( 
   Predicate<DataGridRow> predicate,
   Predicate<DataGridGroupRow> recursionPredicate
)