System.Windows.Controls.AutoCompleteBox.ItemsSourceCollectionChanged C# (CSharp) Méthode

        private void ItemsSourceCollectionChanged(NotifyCollectionChangedEventArgs e)
        {
            // Update the cache
            if(e.Action == NotifyCollectionChangedAction.Remove && e.OldItems != null)
            {
                for(int index = 0; index < e.OldItems.Count; index++)
                {
                    _items.RemoveAt(e.OldStartingIndex);
                }
            }
            if(e.Action == NotifyCollectionChangedAction.Add && e.NewItems != null && _items.Count >= e.NewStartingIndex)
            {
                for(int index = 0; index < e.NewItems.Count; index++)
                {
                    _items.Insert(e.NewStartingIndex + index, e.NewItems[index]);
                }
            }
            if(e.Action == NotifyCollectionChangedAction.Replace && e.NewItems != null && e.OldItems != null)
            {
                foreach(object t in e.NewItems)
                {
                    _items[e.NewStartingIndex] = t;
                }
            }

            // Update the view
            if(e.Action == NotifyCollectionChangedAction.Remove || e.Action == NotifyCollectionChangedAction.Replace)
            {
                if(e.OldItems != null)
                {
                    foreach(object t in e.OldItems)
                    {
                        _view.Remove(t);
                    }
                }
            }

            if(e.Action == NotifyCollectionChangedAction.Reset)
            {
                // Significant changes to the underlying data.
                ClearView();
                if(ItemsSource != null)
                {
                    _items = new List<object>(ItemsSource.Cast<object>().ToList());
                }
            }

            // Refresh the observable collection used in the selection adapter.
            RefreshView();
        }