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copied!<h1>ItemsObservableObservableCollection</h1> <p>The following class is intended to overcome the problem that ObservableCollection does not listen to the changes of the contained objects.</p> <p>The pre-requisite is that the objects which are being added to this collection should implement INotifyPropertyChanged interface.</p> <p>In short, this class registers to the items' PropertyChanged event and rises the CollectionChanged event of the ObservableCollection.</p> <p><a href="http://msdn.microsoft.com/en-us/magazine/dd252944.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/magazine/dd252944.aspx</a></p> <pre><code>using System.ComponentModel; using System.Collections.ObjectModel; using System.Collections.Specialized; using System.Collections; namespace VJ.Collections { /// <summary> /// This class adds the ability to refresh the list when any property of /// the objects changes in the list which implements the INotifyPropertyChanged. /// /// </summary> /// <typeparam name="T"> /// The type of elements in the collection. /// </typeparam> public class ItemsObservableObsrvableCollection<T> : ObservableCollection<T> where T : INotifyPropertyChanged { protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e) { if (e.Action == NotifyCollectionChangedAction.Add) { RegisterPropertyChanged(e.NewItems); } else if (e.Action == NotifyCollectionChangedAction.Remove) { UnRegisterPropertyChanged(e.OldItems); } else if (e.Action == NotifyCollectionChangedAction.Replace) { UnRegisterPropertyChanged(e.OldItems); RegisterPropertyChanged(e.NewItems); } base.OnCollectionChanged(e); } protected override void ClearItems() { UnRegisterPropertyChanged(this); base.ClearItems(); } private void RegisterPropertyChanged(IList items) { foreach (INotifyPropertyChanged item in items) { item.PropertyChanged += new PropertyChangedEventHandler(item_PropertyChanged); } } private void UnRegisterPropertyChanged(IList items) { foreach (INotifyPropertyChanged item in items) { item.PropertyChanged -= new PropertyChangedEventHandler(item_PropertyChanged); } } private void item_PropertyChanged(object sender, PropertyChangedEventArgs e) { base.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); } } } </code></pre>

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