private void PopulateAssignedLecturerData(Course course)
{
var allLecturers = db.Lecturers;
var courseLecturers = new HashSet<int>(course.AllLecturesTeachingTheCourse.Select(c => c.LecturerID));
var viewModel = new List<AssignedLecturerData>();
foreach (var lecturer in allLecturers)
{
viewModel.Add(new AssignedLecturerData
{
LecturerID = lecturer.LecturerID,
FirstName = lecturer.FirstName,
LastName = lecturer.LastName,
Assigned = courseLecturers.Contains(lecturer.LecturerID)
});
}
ViewBag.Lecturers = viewModel;
}
private void UpdateCourseLecturers(string[] selectedLecturers, Course CourseToUpdate)
{
if (selectedLecturers == null)
{
CourseToUpdate.AllLecturesTeachingTheCourse = new List<Lecturer>();
return;
}
var selectedLecturersHS = new HashSet<string>(selectedLecturers);
var CourseLecturers = new HashSet<int>
(CourseToUpdate.AllLecturesTeachingTheCourse.Select(c => c.LecturerID));
foreach (var lecturer in db.Lecturers)
{
if (selectedLecturersHS.Contains(lecturer.LecturerID.ToString()))
{
if (!CourseLecturers.Contains(lecturer.LecturerID))
{
CourseToUpdate.AllLecturesTeachingTheCourse.Add(lecturer);
}
}
else
{
if (CourseLecturers.Contains(lecturer.LecturerID))
{
CourseToUpdate.AllLecturesTeachingTheCourse.Remove(lecturer);
}
}
}
}
public ActionResult CreateCourse()
{
var course = new Course();
course.AllLecturesTeachingTheCourse = new List<Lecturer>();
PopulateDepartmentsDropDownList();
PopulateAssignedLecturerData(course);
return View();
}