public static IOrderedQueryable <T> AddOrderBy <T, TKey>(this IOrderedQueryable <T> q,
Expression <Func <T, TKey> > orderExpression, bool isDescending = false)
{
var hasBeenOrdered = q.IsOrdered();
if (hasBeenOrdered)
{
return(!isDescending?q.ThenBy(orderExpression) : q.ThenByDescending(orderExpression));
}
return(!isDescending?q.OrderBy(orderExpression) : q.OrderByDescending(orderExpression));
}