public async Task <IActionResult> CourseEdit(int id, CourseStudentsVM viewmodel)
{
if (id != viewmodel.Enrollments.CourseId)
{
return(NotFound());
}
if (ModelState.IsValid)
{
{
IEnumerable <int> liststudents = viewmodel.SelectedStudents;
IEnumerable <int> existstudents = _context.Enrollment.Where(s => liststudents.Contains((int)s.StudentId) && s.CourseId == id).Select(s => (int)s.StudentId);
IEnumerable <int> newstudents = liststudents.Where(s => !existstudents.Contains(s));
foreach (int studentId in newstudents)
{
_context.Enrollment.Add(new Enrollment {
StudentId = studentId, CourseId = id, Year = viewmodel.Enrollments.Year, Semester = viewmodel.Enrollments.Semester
});
}
await _context.SaveChangesAsync();
}
//catch (DbUpdateConcurrencyException)
//{
// if (!CourseExists(viewmodel.Course.id))
// {
// return NotFound();
// }
// else
// {
// throw;
// }
//}
return(RedirectToAction(nameof(CourseIndex)));
}
//ViewData["FirstTeacherId"] = new SelectList(_context.Teacher, "Id", "FirstName", viewmodel.Course.FirstTeacherId);
//ViewData["SecondTeacherId"] = new SelectList(_context.Teacher, "Id", "FirstName", viewmodel.Course.SecondTeacherId);
return(View(viewmodel));
}
// GET: Courses/Edit/5
public async Task <IActionResult> CourseEdit(int?id)
{
if (id == null)
{
return(NotFound());
}
var course = _context.Course.Where(m => m.id == id).Include(m => m.Students).First();
if (course == null)
{
return(NotFound());
}
CourseStudentsVM viewmodel = new CourseStudentsVM
{
StudentList = new MultiSelectList(_context.Student.OrderBy(s => s.FirstName), "Id", "FirstName"),
SelectedStudents = course.Students.Select(sa => (int)sa.StudentId).ToList()
};
ViewData["Idd"] = id;
ViewData["CourseTitle"] = _context.Course.Where(c => c.id == id).Select(c => c.Title).FirstOrDefault();
return(View(viewmodel));
}
