Binding for separate threads

I had been in struggling with binding data into Grid using ObservableCollection because of exception "This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread" then I just figured out that: try to adding items to this collection "ObservableCollection" out of the main thread, we will get the exception mentioned above. Searching around, found http://www.thomaslevesque.com/tag/mvvm/ this help me! Actually, I wanna to say big thanks Thomas to share his knowledge.

Here are solutions: using SynchronizationContext since it is the one collection was created. Below is implementation:

public class AsyncObservableCollection<T> : ObservableCollection<T>

{

    private SynchronizationContext _synchronizationContext = SynchronizationContext.Current;

 

    public AsyncObservableCollection()

    {

    }

 

    public AsyncObservableCollection(IEnumerable<T> list)

        : base(list)

    {

    }

 

    protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)

    {

        if (SynchronizationContext.Current == _synchronizationContext)

        {

            // Execute the CollectionChanged event on the current thread

            RaiseCollectionChanged(e);

        }

        else

        {

            // Post the CollectionChanged event on the creator thread

            _synchronizationContext.Post(RaiseCollectionChanged, e);

        }

    }

 

    private void RaiseCollectionChanged(object param)

    {

        // We are in the creator thread, call the base implementation directly

        base.OnCollectionChanged((NotifyCollectionChangedEventArgs)param);

    }

 

    protected override void OnPropertyChanged(PropertyChangedEventArgs e)

    {

        if (SynchronizationContext.Current == _synchronizationContext)

        {

            // Execute the PropertyChanged event on the current thread

            RaisePropertyChanged(e);

        }

        else

        {

            // Post the PropertyChanged event on the creator thread

            _synchronizationContext.Post(RaisePropertyChanged, e);

        }

    }

 

    private void RaisePropertyChanged(object param)

    {

        // We are in the creator thread, call the base implementation directly

        base.OnPropertyChanged((PropertyChangedEventArgs)param);

    }

}

Note: instances of this class must be created on the UI thread (inside Dispatcher)