public async Task <IActionResult> OnPostDeleteCourseAsync(int?id)
{
_logger.LogWarning($"OnPost: StudentId {id}, DROP course {CourseIdToDelete}");
if (id == null)
{
return(NotFound());
}
Student = await _context.Student.Include(s => s.StudentCourses).ThenInclude(sc => sc.Course).FirstOrDefaultAsync(m => m.StudentID == id);
//AllCourses = await _context.Course.ToListAsync();
//CoursesDropDown = new SelectList(AllCourses, "CourseID", "Description");
if (Student == null)
{
return(NotFound());
}
StudentCourse courseToDrop = _context.StudentCourse.Find(CourseIdToDelete, id.Value);
if (courseToDrop != null)
{
_context.Remove(courseToDrop);
_context.SaveChanges();
}
else
{
_logger.LogWarning("Student NOT enrolled in course");
}
return(RedirectToPage(new { id = id }));
}
private void UpdateStudentCourses(int[] selectedCourses, Student studentToUpdate)
{
if (selectedCourses == null)
{
studentToUpdate.StudentCourses = new List <StudentCourse>();
return;
}
List <int> currentCourses = studentToUpdate.StudentCourses.Select(c => c.CourseID).ToList();
List <int> selectedCoursesList = selectedCourses.ToList();
foreach (var course in _context.Course)
{
if (selectedCoursesList.Contains(course.CourseID))
{
if (!currentCourses.Contains(course.CourseID))
{
// Add course here
studentToUpdate.StudentCourses.Add(
new StudentCourse {
StudentID = studentToUpdate.StudentID, CourseID = course.CourseID
}
);
_logger.LogWarning($"Student {studentToUpdate.FirstName} {studentToUpdate.LastName} ({studentToUpdate.StudentID}) - ADD {course.CourseID} {course.Description}");
}
}
else
{
if (currentCourses.Contains(course.CourseID))
{
// Remove course here
StudentCourse courseToRemove = studentToUpdate.StudentCourses.SingleOrDefault(s => s.CourseID == course.CourseID);
_context.Remove(courseToRemove);
_logger.LogWarning($"Student {studentToUpdate.FirstName} {studentToUpdate.LastName} ({studentToUpdate.StudentID}) - DROP {course.CourseID} {course.Description}");
}
}
}
}