public StatusTransport<StudentViewModel> SaveStudent(StudentViewModel model)
{
var transport = new StatusTransport<StudentViewModel>();
var student = new Student(model);
_context.Students.Attach(student, true);
try
{
_context.SubmitChanges();
// Retrieve most recent version.
_context.Refresh(RefreshMode.OverwriteCurrentValues, student);
transport.ViewModel = new StudentViewModel(student)
{ ClientId = model.ClientId };
transport.SetSuccess();
// Update all connected clients. Comment this line out to test
// normal conflict resolution.
BroadcastStudent(transport);
}
catch (ChangeConflictException exConflict)
{
// Retrieve most recent version.
_context.Refresh(RefreshMode.OverwriteCurrentValues, student);
transport.ViewModel = new StudentViewModel(student);
// Mark result as stale.
transport.SetStale(exConflict);
}
return transport;
}
public StudentViewModel(Student student)
{
Id = student.Id;
FirstName = student.FirstName;
LastName = student.LastName;
GPA = student.GPA;
IsEnrolled = student.IsEnrolled;
Version = Convert.ToBase64String((student.Version ?? new byte[] { }).ToArray());
}
partial void DeleteStudent(Student instance);
partial void UpdateStudent(Student instance);
partial void InsertStudent(Student instance);
