ObservableCollection and Multi-Threading

These days I was looking for a synchronized implementation of ObservableCollection<T>, i.e. to generate notifications in the same thread that created the collection. Unfortunately .NET 3.0 doesn’t provide one, and there are only a few Internet blog entries with some sample code and discussions.
However, after reviewing the existing sample code both from public blogs and from MSDN (usually the examples used the WPF Dispatcher object, which is fine for WPF only components, but I needed my collection to work also outside WPF), I reached out to this simple implementation (although possibly, not the most optimal). Anyway it works not only in WPF or UI, but also wherever you may need threading synchronization for the collection notifications (I hope it helps someone):


class MyCollection<T> : ObservableCollection<T>


  private SynchronizationContext dispatcher = SynchronizationContext.Current;

  protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)


SendOrPostCallback)delegate { base.OnCollectionChanged((NotifyCollectionChangedEventArgs)e); }, e);


  protected override void OnPropertyChanged(PropertyChangedEventArgs e)


SendOrPostCallback)delegate { base.OnPropertyChanged((PropertyChangedEventArgs)e); }, e);



About Sorin Dolha

My passion is software development, but I also like physics.
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