How do I reliably get an image dimensions in .NET without loading the image?

Question

I know how to get the size (x,y) of an image

Image.FromFile("cat.jpg").Size

BUT that requires loading the image from memory.

When I view the images in Windows Explorer it shows me the size.

• How do I access that size?
• Is it reliable for all images? Does Windows explorer need to have 'seen' the image first for the size to be available. I don't want to upload to a server and have no metadata available before I've loaded it in internet explorer.

Edit: I changed the subject from 'size' to 'dimensions' to clarify which size i wanted.

Answer 1

You can just use Image.FromStream(Stream, bool, bool) with "false" 2nd and 3rd parameter to avoid loading file into memory.