CODEWITHSUNDEEP
wpfmultithreading.net-4.0
Y.Yanavichus
Y.Yanavichus

Reputation: 2417

How to update CollectionViewSource's Source property from Task?

I want to load my CollectionViewSource asynchronously. So I wrote such code:

list1 = new List<int>();
list2 = new List<int>();

Task.Factory.StartNew<Tuple<List<int>, List<int>>>(() =>
{
    // Create and return tuple with 2 lists
}).ContinueWith(doneTask =>
{
    list1 = doneTask.Result.Item1;
    list2 = doneTask.Result.Item2;
    // update UI
    collectionViewSource1.Source = list1;
    collectionViewSource2.Source = list2;
}, TaskScheduler.FromCurrentSynchronizationContext());

But this code doesn't work.

Exception System.ArgumentException: Must create DependencySource on same Thread as the DependencyObject. occurs.

Upvotes: 2

Views: 829

Answers (1)

brunnerh
brunnerh

Reputation: 184777

DependencyObjects have thread affinity, you cannot modify them on a background thread. You should be able to do this using the application's Dispatcher like this:

App.Current.Dispatcher.Invoke((Action)delegate
{
    collectionViewSource1.Source = list1;
    collectionViewSource2.Source = list2;
}, null);

This article on MSDN might provide more relevant information.

Upvotes: 1

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