//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------ namespace System.Runtime.Collections { using System.Collections.ObjectModel; // simple helper class to allow passing in a func that performs validations of // acceptible values class ValidatingCollection : Collection { public ValidatingCollection() { } public Action OnAddValidationCallback { get; set; } public Action OnMutateValidationCallback { get; set; } void OnAdd(T item) { if (OnAddValidationCallback != null) { OnAddValidationCallback(item); } } void OnMutate() { if (OnMutateValidationCallback != null) { OnMutateValidationCallback(); } } protected override void ClearItems() { OnMutate(); base.ClearItems(); } protected override void InsertItem(int index, T item) { OnAdd(item); base.InsertItem(index, item); } protected override void RemoveItem(int index) { OnMutate(); base.RemoveItem(index); } protected override void SetItem(int index, T item) { OnAdd(item); OnMutate(); base.SetItem(index, item); } } }