public LecturePlan GetLecturePlan(LecturePlan lectureplan)
{
LecturePlan result = null;
foreach (LecturePlan item in lecturePlans)
{
if (lectureplan.Equals(item))
{
result = lectureplan;
}
}
if (result == null)
{
throw new NullReferenceException();
}
return(result);
}
public LecturePlan GetLecturePlanByID(int id)
{
LecturePlan result = null;
foreach (LecturePlan item in lecturePlans)
{
if (id.Equals(item.ID))
{
result = item;
}
}
if (result == null)
{
throw new NullReferenceException();
}
return(result);
}
public void RemoveLecturePlanByID(int id)
{
LecturePlan lecturePlan = GetLecturePlanByID(id);
RemoveLecturePlan(lecturePlan);
}
public void RemoveLecturePlan(LecturePlan lectureplan)
{
lecturePlans.Remove(lectureplan);
}
public int AddLecturePlan(LecturePlan lectureplan)
{
lectureplan.ID = this.NextID();
lecturePlans.Add(lectureplan);
return(lectureplan.ID);
}