Paralallel continuation

parallelWPF.cs

private void btnWordStatsParallelInTask_Click(object sender, RoutedEventArgs e)
        {
            /*
	            10 nejcastejsich slov v kazdem souboru - paralelně
	        */
            txbResultsInfo.Text = "";
            Stopwatch w = new Stopwatch();
            w.Start();

            Mouse.OverrideCursor = System.Windows.Input.Cursors.Wait;

            Task.Run(() => Parallel.ForEach(_files, (file) =>
            {
                Dictionary<string, int> stats = new Dictionary<string, int>();

                foreach (var word in File.ReadAllLines(file.FullName))
                {
                    if (stats.ContainsKey(word))
                        stats[word]++;
                    else
                        stats.Add(word, 1);
                }


                Dispatcher.Invoke(new Action(() =>
                {
                    txbResultsInfo.Text += file.Name + Environment.NewLine;
                    //txbResultsInfo.Text += Environment.NewLine;
                    txbResultsInfo.Text += string.Join(Environment.NewLine, stats.OrderByDescending(x => x.Value).Take(10)
                                                .Select(x => x.Key + ": " + x.Value));

                    txbResultsInfo.Text += Environment.NewLine + Environment.NewLine;

                }), priority: System.Windows.Threading.DispatcherPriority.Send);

            }))
                .ContinueWith((task) =>
                {
                    w.Stop();
                    txbResultsInfo.Text += "Elapsed ms: " + w.ElapsedMilliseconds;
                }, TaskScheduler.FromCurrentSynchronizationContext());


            Mouse.OverrideCursor = null;


            //Dispatcher.BeginInvoke(new Action(() => txbResultsInfo.Text += "Elapsed ms: " + w.ElapsedMilliseconds));

        }