How to get ratio of width x height of an image on disk / file?

I have my userpictures saved as file on my HDD. (Not in database).

I will get the height and width of th开发者_如何学Gois *.jpg-files, how to do that?

(Background: I must calculate the ratio between hight and width to bring it to a specified height and width without stretching it).

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I think it is also worth mentioning that System.Drawing.Image implements IDisposable, so you should always use a using statement or call the Dispose() method on your object to make sure that you are releasing any unmanaged system resources. Example:

using (Image img = System.Drawing.Image.FromFile(path))
{
    int height = img.Height;
    int width = img.Width;
}

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Many formats support a header with that info but others don't so...

 Image img = System.Drawing.Image.FromFile(path);
 int height = img.Height;
 int width = img.Width;

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Use the FromFile static method on the System.Drawing.Bitmap class to load your images. The returned Bitmap instance has Width and Height properties. Altnatively, you can also construct a new Bitmap passing a string path to your image file as a constructor parameter.