public ActionResult Create(Instructor instructor)
{
if (ModelState.IsValid) {
db.Instructors.Add(instructor);
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.PersonID = new SelectList(db.OfficeAssignments, "PersonID", "Location", instructor.PersonID);
return View(instructor);
}
private void UpdateInstructorCourses(string[] selectedCourses, Instructor instructorToUpdate)
{
if (selectedCourses == null) {
instructorToUpdate.Courses = new List<Course>();
return;
}
var selectedCoursesHS = new HashSet<string>(selectedCourses);
var instructorCourses = new HashSet<int>
(instructorToUpdate.Courses.Select(c => c.CourseID));
foreach (var course in db.Courses) {
if (selectedCoursesHS.Contains(course.CourseID.ToString())) {
if (!instructorCourses.Contains(course.CourseID)) {
instructorToUpdate.Courses.Add(course);
}
} else {
if (instructorCourses.Contains(course.CourseID)) {
instructorToUpdate.Courses.Remove(course);
}
}
}
}
private void PopulateAssignedCourseData(Instructor instructor)
{
var allCourses = db.Courses;
var instructorCourses = new HashSet<int>(instructor.Courses.Select(c => c.CourseID));
var viewModel = new List<AssignedCourseData>();
foreach (var course in allCourses) {
viewModel.Add(new AssignedCourseData {
CourseID = course.CourseID,
Title = course.Title,
Assigned = instructorCourses.Contains(course.CourseID)
});
}
ViewBag.Courses = viewModel;
}