Catel.Data.ChangeNotificationWrapper.OnObjectCollectionChanged C# (CSharp) Method

        public void OnObjectCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            var collection = sender as ICollection;

            lock (_lockObject)
            {
                if (e.OldItems != null)
                {
                    foreach (var item in e.OldItems)
                    {
                        UnsubscribeNotifyChangedEvents(item, collection);
                    }
                }

                // Reset requires our own logic
                if (e.Action == NotifyCollectionChangedAction.Reset)
                {
                    if (collection != null)
                    {
                        UpdateCollectionSubscriptions(collection);
                    }
                    else
                    {
                        Log.Warning("Received NotifyCollectionChangedAction.Reset for '{0}', but the type does not implement ICollection", sender.GetType().GetSafeFullName(false));
                    }
                }
                else if (e.NewItems != null)
                {
                    foreach (var item in e.NewItems)
                    {
                        SubscribeNotifyChangedEvents(item, collection);
                    }
                }
            }

            CollectionChanged.SafeInvoke(sender, e);
        }