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copied!<p>After our conversation above, this is rather moot, but I thought about how I'd implement a base class that fired PropertyChanged events when a collection changed in a property that was defined by the subclass. As I said, it's a bit non-standard, but here's how I'd do it.</p> <pre><code>class FancyCollectionAndPropertyChangedBase : INotifyPropertyChanged { private Dictionary<ICollectionChanged, String> collectionNameLookup = new Dictionary<ICollectionChanged, String>(); protected FancyCollectionAndPropertyChangedBase() { this.PropertyChanged += MyPropertyChanged; } private void MyPropertyChanged(object sender, PropertyChangedEventArgs e) { if(this.collectionNameLookup.ContainsValue(e.PropertyName) { KeyValuePair<INotifyCollectionChanged, String> oldValue = this.collectionNameLookup.First(kvp => kvp.Value == e.Name); oldValue.Key -= MyCollectionChanged; this.collecitonNameLookup.Remove(oldValue.Key); INotifyCollectionChanged collection = this.GetType().GetProperty(e.PropertyName, BindingFlags.FlattenHierarchy).GetValue(this, null); collection.CollectionChanged += MyCollectionChanged; this.collectionNameLookup.Add(collection, e.Name); } else if(typeof(INotifyCollectionChanged).IsAssignableFrom(this.GetType().GetProperty(e.PropertyName, BindingFlags.FlattenHierarchy).PropertyType)) { // Note: I may have gotten the IsAssignableFrom statement, above, backwards. INotifyCollectionChanged collection = this.GetType().GetProperty(e.PropertyName, BindingFlags.FlattenHierarchy).GetValue(this, null); collection.CollectionChanged += MyCollectionChanged; this.collectionNameLookup.Add(collection, e.Name); } } private void MyCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { this.NotifyPropertyChanged(this.collectionNameLookup[sender]; } } </code></pre>

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