// #example: Referential integrity
private static void ReferentialIntegrityCheck(object sender,
CancellableObjectEventArgs eventArguments)
{
object toDelete = eventArguments.Object;
if (toDelete is Pilot)
{
IObjectContainer container = eventArguments.ObjectContainer();
IEnumerable<Car> cars = from Car c in container
where c.Pilot == toDelete
select c;
if (cars.Count() > 0)
{
eventArguments.Cancel();
}
}
}
void OnCreating(object sender, CancellableObjectEventArgs args)
{
_events.Add("Creating");
Assert.IsFalse(args.IsCancelled);
args.Cancel();
}
private void OnActivating(object sender, CancellableObjectEventArgs args)
{
if (_doNotActivateTypes.Contains(sender.GetType()))
{
args.Cancel();
}
}