private void BehaviorCollection_VectorChanged()

in src/BehaviorsSDKManaged/Microsoft.Xaml.Interactivity/BehaviorCollection.cs [87:151]

• 52 lines of code
• 10 McCabe index (conditional complexity)

        private void BehaviorCollection_VectorChanged(IObservableVector<DependencyObject> sender, IVectorChangedEventArgs eventArgs)
        {
            if (eventArgs.CollectionChange == CollectionChange.Reset)
            {
                foreach (IBehavior behavior in this._oldCollection)
                {
                    if (behavior.AssociatedObject != null)
                    {
                        behavior.Detach();
                    }
                }

                this._oldCollection.Clear();

                foreach (DependencyObject newItem in this)
                {
                    this._oldCollection.Add(this.VerifiedAttach(newItem));
                }

#if DEBUG
                this.VerifyOldCollectionIntegrity();
#endif
                return;
            }

            int eventIndex = (int)eventArgs.Index;
            DependencyObject changedItem = this[eventIndex];

            switch (eventArgs.CollectionChange)
            {
                case CollectionChange.ItemInserted:
                    this._oldCollection.Insert(eventIndex, this.VerifiedAttach(changedItem));

                    break;

                case CollectionChange.ItemChanged:
                    IBehavior oldItem = this._oldCollection[eventIndex];
                    if (oldItem.AssociatedObject != null)
                    {
                        oldItem.Detach();
                    }

                    this._oldCollection[eventIndex] = this.VerifiedAttach(changedItem);

                    break;

                case CollectionChange.ItemRemoved:
                    oldItem = this._oldCollection[eventIndex];
                    if (oldItem.AssociatedObject != null)
                    {
                        oldItem.Detach();
                    }

                    this._oldCollection.RemoveAt(eventIndex);
                    break;

                default:
                    Debug.Assert(false, "Unsupported collection operation attempted.");
                    break;
            }

#if DEBUG
            this.VerifyOldCollectionIntegrity();
#endif
        }