public int NumberOfStudentsPerSubject(Subject subject)
{
int numberOfStudents = 0;
IEnumerable <StudentSubject> studentSubjects = FindStudentSubjectsBySubject(subject);
studentService = new StudentService();
foreach (StudentSubject studentSubject in studentSubjects)
{
Student student = studentService.GetStudentByID(studentSubject.StudentID);
if (student != null && student.isEnrolled)
{
numberOfStudents++;
}
}
return(numberOfStudents);
}
public Grade?GetStudentAverageGradePerCourse(Course course)
{
studentService = new StudentService();
subjectService = new SubjectService();
studentSubjectService = new StudentSubjectService();
gradeService = new GradeService();
int studentsAverageGrade;
int studentsAverageRounded;
Grade?averageGrade;
List <Subject> subjectsFromACourse = subjectService.GetSubjectsFromACourse(course);
int numberOfSubjectsInACourse = subjectsFromACourse.Count();
int numberOfStudentsRegisteredInACourse = studentService
.GetStudentsRegisteredInACourse(course).Count();
int studentsTotalGrades = studentSubjectService
.GetTotalStudentGradesFromACourse(course);
int numberOfStudentSubjectsGraded = GetNumberOfStudentsSubjectsGradedInACourse(subjectsFromACourse);
if (numberOfSubjectsInACourse != 0 && numberOfStudentSubjectsGraded != 0)
{
studentsAverageGrade =
studentsTotalGrades / numberOfStudentSubjectsGraded;
}
else
{
studentsAverageGrade = 0;
}
studentsAverageRounded = (int)Math.Round((decimal)studentsAverageGrade);
averageGrade = gradeService.ConvertIntToGrade(studentsAverageRounded);
return(averageGrade);
}
public Student RegisterStudent(UniversityStudentsList student)
{
courseSubjectService = new CourseSubjectService();
studentService = new StudentService();
studentSubjectService = new StudentSubjectService();
universityStudentsListService = new UniversityStudentsListService();
Student studentToRegister = new Student();
// adding and saving student to db, changing university list isEnrolled to true
studentToRegister = studentService.AddStudent(student);
//populate student with student subjects
ICollection <Subject> studentCourseSubjects = new List <Subject>();
studentCourseSubjects = courseSubjectService.GetSubjectsFromCourse(studentToRegister.CourseId);
studentSubjectService.CreateStudentSubjectList(studentCourseSubjects.ToList(),
studentToRegister);
return(studentToRegister);
}
