public bool RemoveTeacher(Teacher t)
{
if (t == null)
throw new NullReferenceException();
string name = t.Name;
if (_listteacher.ContainsKey(name))
{
_listteacher.Remove(name);
return true;
}
else
{
return false;
}
}
public void AddTeacher(Teacher t)
{
if (t == null)
throw new NullReferenceException();
string name = t.Name;
_listteacher.Add(name, t);
}
//TEACHER
public Teacher AddTeacher(string name, string firstname)
{
if (string.IsNullOrWhiteSpace(name) || string.IsNullOrWhiteSpace(firstname))
{
throw new NullReferenceException();
}
if (_listteacher.ContainsKey(name))
{
throw new ArgumentException();
}
Teacher teacher = new Teacher(name, firstname, this);
_listteacher.Add(name, teacher);
return teacher;
}
