自定义过滤OpenFileDialog

Question

I am trying to make a program that will allow a user to view an icon in a PictureBox. I want the user to only be able to open images that are 24x24 pixels.

I would like to put a filter in an OpenFileDialog to only show images that are 24x24. Is there any way to do this? I heard that it may be possible by customizing the OpenFileDialog and using P/Invoke.

Answer 1

You could check the Width and Height of the image:

// 'image' is the image you want to check
if(image.Width > 24 || image.Height > 24)
    MessageBox.Show("Please select a smaller image!");
else
    // This code will always run if the image is smaller than 24x24

Hope this helps!

Answer 2

If you're reading it in by storing it as an object (which I assume you are), you just need to read off imageObject.Width "using System.Drawing;" or "using System.Drawing.Image;"

examples here and here .

Answer 3

You can't do this with the OpenFileDialog. You would need to write your own dialog that would interrogate the files in each folder and determine if they match your criteria and then show only those files.