Hi,

I have a Listviewloaded withthumbnail images using background thread.It loads all the images from the directory.But when I select the image fromthe Listview to display into the user control, it won't display the correct image. It looks like the SelectedIndex problem. SelectedIndex doesn't work with first two images. What could be the problem? Thanks for any help.

string
[] files = System.IO.Directory.GetFiles(ImageFolder);
 
private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
  {
   try{ 
   int progress = 0;

    string pname;
    Image myImage;
   // max_length = files.Length - 2;

    for (i = 0; i < files.Length; i++)
    {
      ProgressInfo info = new ProgressInfo();

      pname = System.IO.Path.GetFullPath(files[i]);
      myImage = Image.FromFile(pname);
      info.Image = myImage;
      info.ImageIndex = i;
      backgroundWorker1.ReportProgress(progress, info);
      myImage = null;
    }

   }
   catch (Exception ex)
   {
     throw ex.InnerException;
   }
  }

 private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
  {
    try
    {
      //Get image.
      ProgressInfo img = e.UserState as ProgressInfo;

      ImgListView.Images.Add(getThumbnaiImage(ImgListView.ImageSize.Width, img.Image));
      fname = System.IO.Path.GetFileName(files[img.ImageIndex]);
      ListViewItem lvwItem = new ListViewItem(fname, img.ImageIndex);
      lvwItem.Tag = files[i];

      lstThumbNailView.Items.AddRange(new ListViewItem[] { lvwItem });

    }
    catch (Exception ex)
    {
      throw ex.InnerException;
    }
  }

private void listView_SelectedIndexChanged(Object sender, EventArgs e)

{
ListView.SelectedListViewItemCollection selectedItems = lstThumbNailView.SelectedItems;

   ListViewItem lvi = lstThumbNailView.SelectedItems[0];
    string s = (string)lvi.Tag;
    this.viewer1.Image = Image.FromFile(s);
}

The SelectedIndexChanged event handler as posted cannot work, it will always crash on SelectedItems[0] when you change selections. The event fires twice, first when the selected item becomes unselected, again when the new item becomes selected. I reckon this has something to do with your problem.

---

Hans Passant.

Hi anate,

You need to check if there are some items selected before do anything. This is a code snippet:


Regards,
Aland Li

---

Please mark the replies as answers if they help and unmark if they don't. This can be beneficial to other community members reading the thread.

The SelectedIndexChanged event handler as posted cannot work, it will always crash on SelectedItems[0] when you change selections. The event fires twice, first when the selected item becomes unselected, again when the new item becomes selected. I reckon this has something to do with your problem.

---

Hans Passant.

Thanks for your help. What could be the best way to solve this issue?

Hi anate,

You need to check if there are some items selected before do anything. This is a code snippet:


Regards,
Aland Li

---

Please mark the replies as answers if they help and unmark if they don't. This can be beneficial to other community members reading the thread.