// GET: Instructors/Create
public IActionResult Create()
{
var instructor = new Instructor();
instructor.Courses = new List<CourseAssignment>();
PopulateAssignedCourseData(instructor);
return View();
}
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(int[] selectedCourses, Instructor instructorToUpdate)
{
if (selectedCourses == null)
{
instructorToUpdate.Courses = new List<Course>();
return;
}
var selectedCoursesHS = new HashSet<int>(selectedCourses);
var instructorCourses = new HashSet<int>(instructorToUpdate.Courses.Select(c => c.Id));
foreach (var course in UoW.Courses.GetAll())
{
if (selectedCoursesHS.Contains(course.Id))
{
if (!instructorCourses.Contains(course.Id))
{
instructorToUpdate.Courses.Add(course);
}
}
else
{
if (instructorCourses.Contains(course.Id))
{
instructorToUpdate.Courses.Remove(course);
}
}
}
}
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;
}
// new fuction to get the classes that are selected from the checkbox to add those classes for the Instructor
private void UpdateInstructorCourses(string[] selectedCourses, Instructor instructorToUpdate)
{
if (selectedCourses == null)
{
//If no check boxes were selected, the code in UpdateInstructorCourses initializes the Courses navigation property with an empty collection
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 the courses are selected from the checkbox
{
if (!instructorCourses.Contains(course.CourseID))//if the courses that are selected are not in the Instructor.Courses navigation property
{
instructorToUpdate.Courses.Add(course);
}
}
else
{
if (instructorCourses.Contains(course.CourseID))// if the corses aren't selected, but they are in the Instructor.Courses navigation property,
//and then delete them
{
instructorToUpdate.Courses.Remove(course);
}
}
}
}
private void PopulateAssignedCourseData(Instructor instructor)
{
var allCourses = db.Courses; // db is an iobject that is pointing to SchoolContext Class, and then use db.Courses to access to the
// fuction Courses in the SchoolContext Class which mean to access to the Course table in the data base
var instructorCourses = new HashSet<int>(instructor.Courses.Select(c => c.CourseID));//create the mark in the checkbox for the classes
//base on the PersonID
var viewModel = new List<AssignedCourseData>();// object viewModel is pointing to AssignedCourseData class, and viewModel is going to
//use for adding data to the CourseID, Title, and Assigned in the AssignedCourseData class
foreach (var course in allCourses)// loop through all the classes in the Course table
{
viewModel.Add(new AssignedCourseData
{
CourseID = course.CourseID,
Title = course.Title,
Assigned = instructorCourses.Contains(course.CourseID)//get the CourseID base on the Instructor
// Assigned is bool type
});
}
ViewBag.Courses = viewModel;
}
public static void Initialize(SchoolContext context)
{
//context.Database.EnsureCreated();
// Look for any students.
if (context.Students.Any())
{
return; // DB has been seeded
}
var students = new Student[]
{
new Student {
FirstMidName = "Carson", LastName = "Alexander",
EnrollmentDate = DateTime.Parse("2010-09-01")
},
new Student {
FirstMidName = "Meredith", LastName = "Alonso",
EnrollmentDate = DateTime.Parse("2012-09-01")
},
new Student {
FirstMidName = "Arturo", LastName = "Anand",
EnrollmentDate = DateTime.Parse("2013-09-01")
},
new Student {
FirstMidName = "Gytis", LastName = "Barzdukas",
EnrollmentDate = DateTime.Parse("2012-09-01")
},
new Student {
FirstMidName = "Yan", LastName = "Li",
EnrollmentDate = DateTime.Parse("2012-09-01")
},
new Student {
FirstMidName = "Peggy", LastName = "Justice",
EnrollmentDate = DateTime.Parse("2011-09-01")
},
new Student {
FirstMidName = "Laura", LastName = "Norman",
EnrollmentDate = DateTime.Parse("2013-09-01")
},
new Student {
FirstMidName = "Nino", LastName = "Olivetto",
EnrollmentDate = DateTime.Parse("2005-09-01")
}
};
foreach (Student s in students)
{
context.Students.Add(s);
}
context.SaveChanges();
var instructors = new Instructor[]
{
new Instructor {
FirstMidName = "Kim", LastName = "Abercrombie",
HireDate = DateTime.Parse("1995-03-11")
},
new Instructor {
FirstMidName = "Fadi", LastName = "Fakhouri",
HireDate = DateTime.Parse("2002-07-06")
},
new Instructor {
FirstMidName = "Roger", LastName = "Harui",
HireDate = DateTime.Parse("1998-07-01")
},
new Instructor {
FirstMidName = "Candace", LastName = "Kapoor",
HireDate = DateTime.Parse("2001-01-15")
},
new Instructor {
FirstMidName = "Roger", LastName = "Zheng",
HireDate = DateTime.Parse("2004-02-12")
}
};
foreach (Instructor i in instructors)
{
context.Instructors.Add(i);
}
context.SaveChanges();
var departments = new Department[]
{
new Department {
Name = "English", Budget = 350000,
StartDate = DateTime.Parse("2007-09-01"),
InstructorID = instructors.Single(i => i.LastName == "Abercrombie").ID
},
new Department {
Name = "Mathematics", Budget = 100000,
StartDate = DateTime.Parse("2007-09-01"),
InstructorID = instructors.Single(i => i.LastName == "Fakhouri").ID
},
new Department {
Name = "Engineering", Budget = 350000,
StartDate = DateTime.Parse("2007-09-01"),
InstructorID = instructors.Single(i => i.LastName == "Harui").ID
},
new Department {
Name = "Economics", Budget = 100000,
StartDate = DateTime.Parse("2007-09-01"),
InstructorID = instructors.Single(i => i.LastName == "Kapoor").ID
}
};
foreach (Department d in departments)
{
context.Departments.Add(d);
}
context.SaveChanges();
var courses = new Course[]
{
new Course {
CourseID = 1050, Title = "Chemistry", Credits = 3,
DepartmentID = departments.Single(s => s.Name == "Engineering").DepartmentID
},
new Course {
CourseID = 4022, Title = "Microeconomics", Credits = 3,
DepartmentID = departments.Single(s => s.Name == "Economics").DepartmentID
},
new Course {
CourseID = 4041, Title = "Macroeconomics", Credits = 3,
DepartmentID = departments.Single(s => s.Name == "Economics").DepartmentID
},
new Course {
CourseID = 1045, Title = "Calculus", Credits = 4,
DepartmentID = departments.Single(s => s.Name == "Mathematics").DepartmentID
},
new Course {
CourseID = 3141, Title = "Trigonometry", Credits = 4,
DepartmentID = departments.Single(s => s.Name == "Mathematics").DepartmentID
},
new Course {
CourseID = 2021, Title = "Composition", Credits = 3,
DepartmentID = departments.Single(s => s.Name == "English").DepartmentID
},
new Course {
CourseID = 2042, Title = "Literature", Credits = 4,
DepartmentID = departments.Single(s => s.Name == "English").DepartmentID
},
};
foreach (Course c in courses)
{
context.Courses.Add(c);
}
context.SaveChanges();
var officeAssignments = new OfficeAssignment[]
{
new OfficeAssignment {
InstructorID = instructors.Single(i => i.LastName == "Fakhouri").ID,
Location = "Smith 17"
},
new OfficeAssignment {
InstructorID = instructors.Single(i => i.LastName == "Harui").ID,
Location = "Gowan 27"
},
new OfficeAssignment {
InstructorID = instructors.Single(i => i.LastName == "Kapoor").ID,
Location = "Thompson 304"
},
};
foreach (OfficeAssignment o in officeAssignments)
{
context.OfficeAssignments.Add(o);
}
context.SaveChanges();
var courseInstructors = new CourseAssignment[]
{
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Chemistry").CourseID,
InstructorID = instructors.Single(i => i.LastName == "Kapoor").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Chemistry").CourseID,
InstructorID = instructors.Single(i => i.LastName == "Harui").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Microeconomics").CourseID,
InstructorID = instructors.Single(i => i.LastName == "Zheng").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Macroeconomics").CourseID,
InstructorID = instructors.Single(i => i.LastName == "Zheng").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Calculus").CourseID,
InstructorID = instructors.Single(i => i.LastName == "Fakhouri").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Trigonometry").CourseID,
InstructorID = instructors.Single(i => i.LastName == "Harui").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Composition").CourseID,
InstructorID = instructors.Single(i => i.LastName == "Abercrombie").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Literature").CourseID,
InstructorID = instructors.Single(i => i.LastName == "Abercrombie").ID
},
};
foreach (CourseAssignment ci in courseInstructors)
{
context.CourseAssignments.Add(ci);
}
context.SaveChanges();
var enrollments = new Enrollment[]
{
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alexander").ID,
CourseID = courses.Single(c => c.Title == "Chemistry").CourseID,
Grade = Grade.A
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alexander").ID,
CourseID = courses.Single(c => c.Title == "Microeconomics").CourseID,
Grade = Grade.C
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alexander").ID,
CourseID = courses.Single(c => c.Title == "Macroeconomics").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alonso").ID,
CourseID = courses.Single(c => c.Title == "Calculus").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alonso").ID,
CourseID = courses.Single(c => c.Title == "Trigonometry").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alonso").ID,
CourseID = courses.Single(c => c.Title == "Composition").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Anand").ID,
CourseID = courses.Single(c => c.Title == "Chemistry").CourseID
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Anand").ID,
CourseID = courses.Single(c => c.Title == "Microeconomics").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Barzdukas").ID,
CourseID = courses.Single(c => c.Title == "Chemistry").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Li").ID,
CourseID = courses.Single(c => c.Title == "Composition").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Justice").ID,
CourseID = courses.Single(c => c.Title == "Literature").CourseID,
Grade = Grade.B
}
};
foreach (Enrollment e in enrollments)
{
var enrollmentInDataBase = context.Enrollments.Where(
s =>
s.Student.ID == e.StudentID &&
s.Course.CourseID == e.CourseID).SingleOrDefault();
if (enrollmentInDataBase == null)
{
context.Enrollments.Add(e);
}
}
context.SaveChanges();
}
private void UpdateInstructorCourses(string[] selectedCourses, Instructor instructor)
{
if (selectedCourses == null)
{
var condition = new PredicateGroup { Operator = GroupOperator.And, Predicates = new List<IPredicate>() };
condition.Predicates.Add(Predicates.Field<CourseInstructor>(s => s.InstructorId, Operator.Eq, instructor.InstructorId));
instructor.Courses.ForEach(c =>
{
condition.Predicates.Add(Predicates.Field<CourseInstructor>(s => s.CourseId, Operator.Eq, c.CourseId));
});
_connection.Delete<CourseInstructor>(condition);
}
else
{
var selectedCourseHs = new HashSet<string>(selectedCourses);
var instructorCourses = new HashSet<int>(
instructor.Courses.Select(s => s.CourseId));
var courseLst = new List<int>();
selectedCourses.ToList().ForEach(s =>
{
courseLst.Add(Convert.ToInt32(s));
});
instructorCourses.ForEach(s =>
{
courseLst.Add(s);
});
foreach (var course in courseLst)
{
if (selectedCourseHs.Contains(course.ToString()))
{
if (!instructorCourses.Contains(course))
{
var courseInstructor = new CourseInstructor
{
InstructorId = instructor.InstructorId,
CourseId = course
};
_connection.Insert(courseInstructor);
}
}
else
{
if (instructorCourses.Contains(course))
{
var condition = new PredicateGroup { Operator = GroupOperator.And, Predicates = new List<IPredicate>() };
condition.Predicates.Add(Predicates.Field<CourseInstructor>(f => f.InstructorId, Operator.Eq, instructor.InstructorId));
condition.Predicates.Add(Predicates.Field<CourseInstructor>(f => f.CourseId, Operator.Eq, course));
_connection.Delete<CourseInstructor>(condition);
}
}
}
}
}
private void PopulateAssignedCourseData(Instructor instructor)
{
var courseLst = GetInstructorCourse(instructor.InstructorId);
courseLst.ForEach(instructor.AddCourse);
var allCourses = _connection.GetList<Course>();
var instructorCourses = new HashSet<int>(instructor.Courses.Select(s => s.CourseId));
var viewModel = allCourses.Select(course => new AssignedCourseData
{
CourseId = course.CourseId,
Title = course.Title,
Assigned = instructorCourses.Contains(course.CourseId)
}).ToList();
_query.Clear();
ViewBag.Courses = viewModel;
}
public static void Initialize(SchoolContext context)
{
//context.Database.EnsureCreated();
// Look for any students.
if (context.Students.Any())
{
return; // DB has been seeded
}
var students = new Student[]
{
new Student { FirstMidName = "Carson", LastName = "Alexander",
EnrollmentDate = DateTime.Parse("2010-09-01") },
new Student { FirstMidName = "Meredith", LastName = "Alonso",
EnrollmentDate = DateTime.Parse("2012-09-01") },
new Student { FirstMidName = "Arturo", LastName = "Anand",
EnrollmentDate = DateTime.Parse("2013-09-01") },
new Student { FirstMidName = "Gytis", LastName = "Barzdukas",
EnrollmentDate = DateTime.Parse("2012-09-01") },
new Student { FirstMidName = "Yan", LastName = "Li",
EnrollmentDate = DateTime.Parse("2012-09-01") },
new Student { FirstMidName = "Peggy", LastName = "Justice",
EnrollmentDate = DateTime.Parse("2011-09-01") },
new Student { FirstMidName = "Laura", LastName = "Norman",
EnrollmentDate = DateTime.Parse("2013-09-01") },
new Student { FirstMidName = "Nino", LastName = "Olivetto",
EnrollmentDate = DateTime.Parse("2005-09-01") }
};
foreach (Student s in students)
{
context.Students.Add(s);
}
context.SaveChanges();
var instructors = new Instructor[]
{
new Instructor { FirstMidName = "Kim", LastName = "Abercrombie",
HireDate = DateTime.Parse("1995-03-11") },
new Instructor { FirstMidName = "Fadi", LastName = "Fakhouri",
HireDate = DateTime.Parse("2002-07-06") },
new Instructor { FirstMidName = "Roger", LastName = "Harui",
HireDate = DateTime.Parse("1998-07-01") },
new Instructor { FirstMidName = "Candace", LastName = "Kapoor",
HireDate = DateTime.Parse("2001-01-15") },
new Instructor { FirstMidName = "Roger", LastName = "Zheng",
HireDate = DateTime.Parse("2004-02-12") }
};
foreach (Instructor i in instructors)
{
context.Instructors.Add(i);
}
context.SaveChanges();
var departments = new Department[]
{
new Department { Name = "English", Budget = 350000,
StartDate = DateTime.Parse("2007-09-01"),
InstructorID = instructors.Single( i => i.LastName == "Abercrombie").ID },
new Department { Name = "Mathematics", Budget = 100000,
StartDate = DateTime.Parse("2007-09-01"),
InstructorID = instructors.Single( i => i.LastName == "Fakhouri").ID },
new Department { Name = "Engineering", Budget = 350000,
StartDate = DateTime.Parse("2007-09-01"),
InstructorID = instructors.Single( i => i.LastName == "Harui").ID },
new Department { Name = "Economics", Budget = 100000,
StartDate = DateTime.Parse("2007-09-01"),
InstructorID = instructors.Single( i => i.LastName == "Kapoor").ID }
};
foreach (Department d in departments)
{
context.Departments.Add(d);
}
context.SaveChanges();
var courses = new Course[]
{
new Course {CourseID = 1050, Title = "Chemistry", Credits = 3,
DepartmentID = departments.Single( s => s.Name == "Engineering").DepartmentID
},
new Course {CourseID = 4022, Title = "Microeconomics", Credits = 3,
DepartmentID = departments.Single( s => s.Name == "Economics").DepartmentID
},
new Course {CourseID = 4041, Title = "Macroeconomics", Credits = 3,
DepartmentID = departments.Single( s => s.Name == "Economics").DepartmentID
},
new Course {CourseID = 1045, Title = "Calculus", Credits = 4,
DepartmentID = departments.Single( s => s.Name == "Mathematics").DepartmentID
},
new Course {CourseID = 3141, Title = "Trigonometry", Credits = 4,
DepartmentID = departments.Single( s => s.Name == "Mathematics").DepartmentID
},
new Course {CourseID = 2021, Title = "Composition", Credits = 3,
DepartmentID = departments.Single( s => s.Name == "English").DepartmentID
},
new Course {CourseID = 2042, Title = "Literature", Credits = 4,
DepartmentID = departments.Single( s => s.Name == "English").DepartmentID
},
};
foreach (Course c in courses)
{
context.Courses.Add(c);
}
context.SaveChanges();
var officeAssignments = new OfficeAssignment[]
{
new OfficeAssignment {
InstructorID = instructors.Single( i => i.LastName == "Fakhouri").ID,
Location = "Smith 17" },
new OfficeAssignment {
InstructorID = instructors.Single( i => i.LastName == "Harui").ID,
Location = "Gowan 27" },
new OfficeAssignment {
InstructorID = instructors.Single( i => i.LastName == "Kapoor").ID,
Location = "Thompson 304" },
};
foreach (OfficeAssignment o in officeAssignments)
{
context.OfficeAssignments.Add(o);
}
context.SaveChanges();
var courseInstructors = new CourseAssignment[]
{
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Chemistry" ).CourseID,
InstructorID = instructors.Single(i => i.LastName == "Kapoor").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Chemistry" ).CourseID,
InstructorID = instructors.Single(i => i.LastName == "Harui").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Microeconomics" ).CourseID,
InstructorID = instructors.Single(i => i.LastName == "Zheng").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Macroeconomics" ).CourseID,
InstructorID = instructors.Single(i => i.LastName == "Zheng").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Calculus" ).CourseID,
InstructorID = instructors.Single(i => i.LastName == "Fakhouri").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Trigonometry" ).CourseID,
InstructorID = instructors.Single(i => i.LastName == "Harui").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Composition" ).CourseID,
InstructorID = instructors.Single(i => i.LastName == "Abercrombie").ID
},
new CourseAssignment {
CourseID = courses.Single(c => c.Title == "Literature" ).CourseID,
InstructorID = instructors.Single(i => i.LastName == "Abercrombie").ID
},
};
foreach (CourseAssignment ci in courseInstructors)
{
context.CourseAssignments.Add(ci);
}
context.SaveChanges();
var enrollments = new Enrollment[]
{
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alexander").ID,
CourseID = courses.Single(c => c.Title == "Chemistry" ).CourseID,
Grade = Grade.A
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alexander").ID,
CourseID = courses.Single(c => c.Title == "Microeconomics" ).CourseID,
Grade = Grade.C
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alexander").ID,
CourseID = courses.Single(c => c.Title == "Macroeconomics" ).CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alonso").ID,
CourseID = courses.Single(c => c.Title == "Calculus" ).CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alonso").ID,
CourseID = courses.Single(c => c.Title == "Trigonometry" ).CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Alonso").ID,
CourseID = courses.Single(c => c.Title == "Composition" ).CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Anand").ID,
CourseID = courses.Single(c => c.Title == "Chemistry" ).CourseID
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Anand").ID,
CourseID = courses.Single(c => c.Title == "Microeconomics").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Barzdukas").ID,
CourseID = courses.Single(c => c.Title == "Chemistry").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Li").ID,
CourseID = courses.Single(c => c.Title == "Composition").CourseID,
Grade = Grade.B
},
new Enrollment {
StudentID = students.Single(s => s.LastName == "Justice").ID,
CourseID = courses.Single(c => c.Title == "Literature").CourseID,
Grade = Grade.B
}
};
foreach (Enrollment e in enrollments)
{
var enrollmentInDataBase = context.Enrollments.Where(
s =>
s.Student.ID == e.StudentID &&
s.Course.CourseID == e.CourseID).SingleOrDefault();
if (enrollmentInDataBase == null)
{
context.Enrollments.Add(e);
}
}
context.SaveChanges();
}
private void UpdateInstructorCourses(string[] selectedCourses, Instructor instructorToUpdate)
{
if (selectedCourses == null)
{
instructorToUpdate.Courses = new List<CourseAssignment>();
return;
}
var selectedCoursesHS = new HashSet<string>(selectedCourses);
var instructorCourses = new HashSet<int>
(instructorToUpdate.Courses.Select(c => c.Course.CourseID));
foreach (var course in _context.Courses)
{
if (selectedCoursesHS.Contains(course.CourseID.ToString()))
{
if (!instructorCourses.Contains(course.CourseID))
{
instructorToUpdate.Courses.Add(new CourseAssignment { InstructorID = instructorToUpdate.ID, CourseID = course.CourseID });
}
}
else
{
if (instructorCourses.Contains(course.CourseID))
{
CourseAssignment courseToRemove = instructorToUpdate.Courses.SingleOrDefault(i => i.CourseID == course.CourseID);
_context.Remove(courseToRemove);
}
}
}
}
public ActionResult Edit(Instructor instructor)
{
if (ModelState.IsValid)
{
db.Entry(instructor).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.InstructorID = new SelectList(db.OfficeAssignments, "InstructorID", "Location", instructor.InstructorID);
return View(instructor);
}