Question

I want to set items(UserControl) to ItemsControl using multithread. My code likes this

System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(SetItemsControl));
    thread.Start();

    void SetItemsControl()
    {
        IDictionary<string, object> list = GetUserControlList(); // this function return list of UserControl
        this.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal,
            new Action(delegate()
            {
                mylistcontrol.ItemsSource = list;

            }));
    }

And it breaks at my initialize function of my usercontrol

The calling thread must be STA, because many UI components require this.

How can i fix it??

Answer 1

The right way to do it is to update the collection that is bound to ItemsControl.ItemsSource. In this scenario you do not touch the visual element from another thread – you update the collection that is bound to it. The collection being updated tells the binding to refresh and that’s when data comes to UI, and it happens already in UI thread so it’s ok. Note that collection should implement INotifyCollectionChanged interface to be able to do that