Accessing ViewModel properties from separate thread

Question

In my wpf application, a time consuming operation in my viewmodel is called using a separate thread. This function, however, accesses several properties in the viewmodel tha

Answer 1

If you use extend your ObservableCollection with this, you can update from a separate thread:

/// 

/// Source: New Things I Learned
/// Title: Have worker thread update ObservableCollection that is bound to a ListCollectionView
/// http://geekswithblogs.net/NewThingsILearned/archive/2008/01/16/have-worker-thread-update-observablecollection-that-is-bound-to-a.aspx
/// Note: Improved for clarity and the following of proper coding standards.
/// 
/// 
protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
    // Use BlockReentrancy
    using (BlockReentrancy())
    {
        var eventHandler = CollectionChanged;

        // Only proceed if handler exists.
        if (eventHandler != null)
        {
            Delegate[] delegates = eventHandler.GetInvocationList();

            // Walk thru invocation list
            foreach (NotifyCollectionChangedEventHandler handler in delegates)
            {
                var currentDispatcher = handler.Target as DispatcherObject;

                // If the subscriber is a DispatcherObject and different thread
                if ((currentDispatcher != null) &&
                    (currentDispatcher.CheckAccess() == false))
                {
                    // Invoke handler in the target dispatcher's thread
                    currentDispatcher.Dispatcher.Invoke(
                        DispatcherPriority.DataBind, handler, this, e);
                }

                else
                {
                    handler(this, e);
                }
            }
        }
    }
}

/// 

/// Overridden NotifyCollectionChangedEventHandler event.
/// 
public override event NotifyCollectionChangedEventHandler CollectionChanged;