private Tuple <List <string>, List <decimal> > FilterCourses(int sectionId, List <string> courseTCs)
{
var notAnnounce = SectionService.NotAnnounce()
.GetValueOrDefault(sectionId) ?? new List <string>();
var groupIds = StringUtils.IntList(notAnnounce).Select(x => (decimal)x).ToList();
if (!groupIds.Any())
{
courseTCs = courseTCs.Except(notAnnounce).ToList();
}
return(Tuple.Create(courseTCs, groupIds));
}
