Open several images in C#

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I need to open several images from a folder and with every image I need to convert it to binary format. How can I open several files automatically within folder\sub folders?

Right Now I am able to open 1 file at a time by manually choosing form the openFileDialog.

C#

openFileDialog1.FileName = "";
openFileDialog1.Title = "Images";           
openFileDialog1.Filter = "Png Images| *.png"; 
openFileDialog1.ShowDialog();
if (openFileDialog1.FileName.ToString() != "")
{
   Image.ImageLocation = openFileDialog1.FileName.ToString();
   img = new Bitmap(openFileDialog1.FileName.ToString());
}

Posted 9-Nov-12 9:17am

datt265

Updated 9-Nov-12 9:42am

fjdiewornncalwe

v2

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OriginalGriff · Accepted Answer · 2012-11-09T09:31:00

Solution 1

If you look closely at the OpenFileDialog class, you will see it has a Multiselect property[^] - set that to true and it will allow the user to select more than one file at a time. You can then use the Filenames property to open each image in a loop.

Do be aware however, that you should Dispose of Bitmap objects when you are finished with, don't just let them go out of scope or it will cause problems later.

BTW: You do not have to call ToString on string objects such as OpenFileDialog.FileName.

Posted 9-Nov-12 9:31am

OriginalGriff

Comments

fjdiewornncalwe 9-Nov-12 15:42pm

+5. Excellent.

datt265 9-Nov-12 15:56pm

I have hundreds of images in several sub folders that will be used to train a neural net, that is why I want to load the files one after the other automatically, instead of having the user selecting which files to open.

OriginalGriff 10-Nov-12 3:31am

Then do it with Directory.GetFiles - it has an overload which return subdirectory contents as well:
Directory.GetFiles(path, "*.*", SearchOption.AllDirectories);