public static void ValidateTeacher(Teacher teacher, Dictionary<Teacher, int> teachersList)
{
int value;
if (teachersList.TryGetValue(teacher, out value))
{
throw new ArgumentException("This teacher has already been added to this class. Cannot add the same teacher again.");
}
}
public void RemoveTeacher(Teacher teacher)
{
int value;
if (setOfTeachers.TryGetValue(teacher, out value))
{
setOfTeachers.Remove(teacher);
}
else
{
throw new ArgumentException("This teacher is not assigned to this class.");
}
}
public void AddTeacher(Teacher teacher)
{
Validator.ValidateTeacher(teacher, this.setOfTeachers);
this.setOfTeachers.Add(teacher, 1);
}
