// GET: Instructor/Create
public ActionResult Create()
{
var instructor = new Instructor();
instructor.Courses = new List<Course>();
PopulateAssignedCourseData(instructor);
return View();
}
protected void Page_Load(object sender, EventArgs e)
{
var instructorID = Request.QueryString["ID"];
if (!IsPostBack && instructorID == null)
{
ddlID.DataSource = Utility.Utility.GetAllPeople();
ddlID.DataTextField = "ID";
ddlID.DataValueField = "ID";
ddlID.DataBind();
}
if (!IsPostBack && instructorID != null)
{
ddlID.DataSource = Utility.Utility.GetAllPeople();
ddlID.DataTextField = "ID";
ddlID.DataValueField = "ID";
ddlID.DataBind();
InstructorService instructorService = new InstructorService();
Contoso.Models.Instructor instructor = instructorService.GetOneInstructor(Convert.ToInt32(instructorID));
ddlID.SelectedValue = instructor.ID.ToString();
txtHireDate.Text = instructor.HireDate.ToString();
}
}
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;
}
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);
}
}
}
}
public ActionResult Create(Instructor instructor)
{
if (ModelState.IsValid)
{
this._db.Instructors.Add(instructor);
this._db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.PersonID = new SelectList(this._db.OfficeAssignments, "PersonID", "Location", instructor.PersonID);
return View(instructor);
}