public Teacher[] GetAggregatedTeachers()
{
string[] allTeachers = _teachersRepository.SelectAllTeachers();
Teacher[] teachers = _teachersRepository.SelectAggregatedTeachers();
List <Teacher> result = new List <Teacher>();
foreach (var teacherName in allTeachers)
{
Teacher teacher = teachers.FirstOrDefault(t => t.Name == teacherName);
if (teacher != null)
{
result.Add(teacher);
}
else
{
result.Add(new Teacher(teacherName));
}
}
return(result.ToArray());
}