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c#.netwinformsopenfiledialog

Custom filtering OpenFileDialog

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.

Solution

  • 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!