private void UpdateInstructorCourses(string[] selectedCourses, IEnumerable <Course> courses)
{
if (selectedCourses == null)
{
CourseAssignments = new List <CourseAssignment>();
return;
}
var selectedCoursesHS = new HashSet <string>(selectedCourses);
var instructorCourses = new HashSet <int>
(CourseAssignments.Select(c => c.CourseID));
foreach (var course in courses)
{
if (selectedCoursesHS.Contains(course.Id.ToString()))
{
if (!instructorCourses.Contains(course.Id))
{
CourseAssignments.Add(new CourseAssignment {
Course = course, Instructor = this
});
}
}
else
{
if (instructorCourses.Contains(course.Id))
{
var toRemove = CourseAssignments.Single(ci => ci.CourseID == course.Id);
CourseAssignments.Remove(toRemove);
}
}
}
}
private void UpdateInstructorCourses(IEnumerable <CreateEdit.Command.CourseData> courses)
{
var assignedCourseIds = courses
.Where(x => x.Assigned).Select(x => x.Id)
.ToArray();
var removedCourses = CourseAssignments
.Where(x => !assignedCourseIds.Contains(x.CourseId))
.ToArray();
var previouslyAssignedCourseIds = CourseAssignments
.Select(x => x.CourseId)
.ToArray();
var addedCourses = assignedCourseIds
.Where(x => !previouslyAssignedCourseIds.Contains(x))
.Select(x => new CourseAssignment {
CourseId = x, InstructorId = Id
})
.ToArray();
foreach (var removedCourse in removedCourses)
{
CourseAssignments.Remove(removedCourse);
}
foreach (var addedCourse in addedCourses)
{
CourseAssignments.Add(addedCourse);
}
}