public static RegistrationResult Register(int cartId)
{
RegistrationResult result = new RegistrationResult();
ShoppingCart cart = ShoppingCartRepository.GetInstance().Get(cartId);
Student student = cart.Student;
foreach (Course course in cart.Courses)
{
if (course.EnrolledStudents.Contains(student))
{
result.Success = false;
result.Errors.Add($"Student {cart.Student.Id} already enrolled in course {course.Name}");
}
}
if (result.Success)
{
foreach (Course course in cart.Courses)
{
course.EnrolledStudents.Add(cart.Student);
}
}
return(result);
}
