UI在运行Task时冻结

Question

May be I am wrong but my assuption is that any background thread can read and write into List or ObservableCollection if I don't care about any particular order. If I need a surtain order I will use BlockingCollection.

    private void buttonTesting_Click(object sender, RoutedEventArgs e)
    {
        PrepareDataForTesting();                
        Stopwatch timer1 = new Stopwatch();
        timer1.Start();           

        //some code preparing data

        List<Task> tasks = new List<Task>();

            //Testing for each pair 
        foreach (InterfaceWithClassName aCompound in Group1) 
        { 
            foreach (InterfaceWithClassName bCompound in Group2) 
            { 
                InstancePair pair = new InstancePair(); 
                //some code 

                Task task = Task.Factory.StartNew(() => TestPairSerial(pair));
                 tasks.Add(task);
             }
          }                

            var ui = TaskScheduler.FromCurrentSynchronizationContext();

            Task.Factory.ContinueWhenAll(tasks.ToArray(),
                antecedents =>
                {
                    timer1.Stop();
                    TimeSpan ts1 = timer1.Elapsed;
                    string elapsedTime1 = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts1.Hours, ts1.Minutes, ts1.Seconds, ts1.Milliseconds / 10);
                    statusLabel_1.Content = "Elapsed time to run the test" + elapsedTime1;
                    statusLabel_0.Content = "Testing made " + passes + " passes";
                    pairsResultsDataGrid.ItemsSource = pairsResultsTable.DefaultView;
                    System.Media.SystemSounds.Exclamation.Play();

                }, CancellationToken.None, TaskContinuationOptions.None, ui);            

                System.Media.SystemSounds.Beep.Play();               
            }

(Note: I am not sure if it matters - "pair" is found through Reflection) When I click the button I can hear the last line - System.Media.SystemSounds.Beep.Play(); meaning we out of the event handler and all the threads are launched. But then my application is still frozen untill ContinueWhenAll is done. TestPairSerial(pair) method has the following structure:

private void TestPairSerial(object instances)
    {
      do 
      { 
          do 
           { 
             //here are two methods that read data from minData ObservableCollection
             //minData is a public static property of MainWindow
             //minData is bound to Chart control (in XAML)

            } while (isSetbCompoundParams); 

        } while (isSetaCompoundParams); 

              //filling up results into one table and two dictionaries (main window variables)
    }

Answer 1

You are executing the tasks in the main thread. You can execute the whole code asynchronously with Dispatcher.BeginInvoke

this.Dispatcher.BeginInvoke(new Action(() => {
    // your code here
}), null);