public async Task <IActionResult> OnGetAsync(int?id, int?studentId)
{
if (id == null)
{
return(NotFound());
}
//Show the LabEnrollments (Students) for the selected Lab.
Lab = await _context.Lab
.Include(c => c.LabEnrollments)
.ThenInclude(s => s.Student)
.AsNoTracking()
.FirstOrDefaultAsync(m => m.LabID == id);
if (Lab == null)
{
return(NotFound());
}
//Remove the LabEnrollment from the database
if (studentId != null)
{
LabEnrollment studentEnrollment = Lab.LabEnrollments.Where(x => x.LabID == id.Value && x.StudentID == studentId).First();
_context.LabEnrollment.Remove(studentEnrollment);
await _context.SaveChangesAsync();
Response.Redirect("/Labs/Details/" + id.ToString());
}
return(Page());
}
//OnPostAsync adds the LabEnrollments to the student selected.
public async Task <IActionResult> OnPostAsync(int?id)
{
if (id == null)
{
return(NotFound());
}
if (!ModelState.IsValid)
{
return(Page());
}
//Get the StudentID
Student = await _context.Student.FindAsync(id);
//If no labs are selected, throw an error message.
if (LabIDs.Length == 0)
{
ModelState.AddModelError("No Lab Selected", "You must select at least one lab to enroll this student in");
return(Page());
}
//Loop through the LabEnrollments and enroll the student in the selected labs.
foreach (int LabId in LabIDs)
{
LabEnrollment studentEnrollment = new LabEnrollment {
StudentID = Student.StudentID, LabID = LabId
};
_context.LabEnrollment.Add(studentEnrollment);
}
await _context.SaveChangesAsync();
return(RedirectToPage("/Students/Index"));
}
//Add LabEnrollments for selected students.
public async Task <IActionResult> OnPostAsync(int?id)
{
if (id == null)
{
return(NotFound());
}
if (!ModelState.IsValid)
{
return(Page());
}
Lab = await _context.Lab.FindAsync(id);
//If no student is selected, throw an error message.
if (StudentIDs.Length == 0)
{
ModelState.AddModelError("No Student Selected", "You must select at least one student to enroll in this lab.");
return(Page());
}
//Loop through the selected StudentIDs and add the enrollments.
foreach (int StudentId in StudentIDs)
{
LabEnrollment studentEnrollment = new LabEnrollment {
LabID = Lab.LabID, StudentID = StudentId
};
_context.LabEnrollment.Add(studentEnrollment);
}
//Save changes
await _context.SaveChangesAsync();
return(RedirectToPage("./Index"));
}
//OnPostAsync launches the lab, and handles all inputs from the users
public async Task <IActionResult> OnPostAsync(int?id, string command)
{
//If the "End Lab" button is clicked, end the lab and sign out the instructor. Redirect to the login page.
if (command.Equals("EndLab"))
{
await HttpContext.SignOutAsync();
return(RedirectToPage("/Index"));
}
Lab = await _context.Lab.Where(l => l.LabID == id).FirstAsync();
//Find LabEnrollment when student signs in or out of lab.
LabEnrollment LabEnrollment = await _context.LabEnrollment.Where(e => e.LabID == id && e.StudentID == StudentID).FirstOrDefaultAsync();
//if the student has not been enrolled in the lab, throw an error message. Calls the LabEnrollmentExists method
if (LabEnrollment == null || !LabEnrollmentExists(LabEnrollment.LabEnrollmentID))
{
ModelState.AddModelError("Error", "You have not been enrolled in this lab, please contact your instructor."); return(Page());
}
//If the student successfully signs into lab, add the DateTime.Now stamp in LabEnrollments
if (command.Equals("Login"))
{
//If the student tries to sign in after already signing in, throw an error message.
if (LabEnrollment.LabSignIn != null)
{
ModelState.AddModelError("Error", "You have already signed into this lab."); return(Page());
}
LabEnrollment.LabSignIn = DateTime.Now;
_context.LabEnrollment.Update(LabEnrollment);
SuccessLogin = true;
}
//If the student successfully signs out of the lab, add the DateTime.Now stamp in LabEnrollments
if (command.Equals("Logout"))
{
//If the student tries to sign out after already signing out, throw an error message.
if (LabEnrollment.LabSignOut != null)
{
ModelState.AddModelError("Error", "You have already signed out of this lab."); return(Page());
}
LabEnrollment.LabSignOut = DateTime.Now;
_context.LabEnrollment.Update(LabEnrollment);
SuccessLogout = true;
}
//Save changes
await _context.SaveChangesAsync();
return(Page());
}
//The OnPostAsync removes the LabEnrollment
public async Task <IActionResult> OnPostAsync(int?id, int labId)
{
if (id == null)
{
return(NotFound());
}
Student = await _context.Student.FindAsync(id);
LabEnrollment studentEnrollment = _context.LabEnrollment
.Where(le => le.StudentID == id && le.LabID == labId).FirstOrDefault();
_context.LabEnrollment.Remove(studentEnrollment);
//Save changes
await _context.SaveChangesAsync();
return(RedirectToPage("./Details"));
}
