Looking for the best way to load list view showing thumbnail pictures of a folder.

Question

Hi,

I've got the following code

files = di.GetFiles("*.jpg");
for (int i = 0; i < files.Length; i++)
{
   il.Images.Add(System.Drawing.Image.FromFile(folder + "\\" + files[i].Name));
   lv.Items.Add(files[i].Name, i);
}

the code fills a System.Windows.Forms.ImageList with pictures from a jpg files. it also creates a System.Windows.Forms.ListView where each item is associated with a picture in the imagelist.

I made the files small and tried to optimize the code. Yet I cant get under 3 seconds for 290 ~30k jpg files(or any other format).

Do you have a better way to load the list view?

Answer 1

One simple change you could make is to change this:

folder + "\\" + files[i].Name

to this:

files[i].FullName

You can also use a foreach loop instead of a for loop:

foreach (FileInfo file in files)
{
   il.Images.Add(System.Drawing.Image.FromFile(file.FullName));
   lv.Items.Add(file.Name, i);
}

And a ListView can work in either bound or unbound mode. You are using unbound mode. Sometimes it is cleaner to use bound mode.

Answer 2

Wrap your code in BeginUpdate / EndUpdate calls for the ListView.