public Trail Add(Trail trail)
{
if (trail == null)
{
throw new ArgumentNullException("trail");
}
trail.Id = _nextId++;
trails.Add(trail);
return trail;
}
public bool Update(Trail trail)
{
if (trail == null)
{
throw new ArgumentNullException("trail");
}
int index = trails.FindIndex(t => t.Id == trail.Id);
if (index == -1)
{
return false;
}
trails.RemoveAt(index);
trails.Add(trail);
return true;
}