I am developing a GUI application using WPF in Visual Studio. I am developing an asynchronous process.
The contents of the process

• Asynchronous processing starts when button is pressed
• Check the path corresponding to the list regularly (once per second) and copy it to the work file storage (loop start)
• Specify the corresponding file copied to Image.Souce (depiction)
• Processing time is drawn in ViewList
• Return to loop start

It is a feeling. Only the relevant part is described. This code compiles fine, but I can't see the image in the Image window of my GUI app. On the other hand, similarly, the additional processing to listView described in Invoke as the UI processing part can be depicted well. I'm sorry I've been stuck for a long time, but I would like to ask for your advice. In addition, I thought that File.delete might be bad, so I erased it, but it was useless.

        private async void show_image (object sender, RoutedEventArgs e)
        {
            ShowButton.IsEnabled = false;
            try
            {
                await Task.Run (() =>
                {
                    while (true)
                    {
// ---------- async loop start ------------ /
                    String origin_image_path = "**. Jpg";
                    String dst_image_path = "***. Jpg"
                    File.Copy (origin_image_path, dst_image_path, true);
                    // lock less bitmap
                    MemoryStream data = new MemoryStream (File.ReadAllBytes (dst_image_path));
                    WriteableBitmap wbmp = new WriteableBitmap (BitmapFrame.Create (data));
                    data.Close ();
                    this.Dispatcher.Invoke ((Action) (() =>
                    {
                        listView.Items.Add (new string [] {str_date, "Start"});
                        listView.Items.Add (new string [] {end_date, "End"});
                        this.MainImage.Source = wbmp;
                    }));
                    File.Delete (dst_image_path);
                    System.Threading.Thread.Sleep (1000/60);
// ------------- async loop end --------------- /
                    }
                });
            }
            catch
            {
            }
            finally
            {
                ShowButton.IsEnabled = true;
            }

        }