多线程下异常：某个 ItemsControl 与它的项源不一致

void UpdateItems()
{
    //retrievedItems is the data you received from the service
    foreach(object item in retrievedItems)
        Dispatcher.BeginInvoke(DispatcherPriority.Background, new ParameterizedThreadStart(AddItem), item);    
}
 
void AddItem(object item)
{
    observableCollection.Add(item);
}