I can't seem to get the DynamicMedia thumbnail crops genereted via. the Upload data type. I can see all my thumbnails in the media folder but can't access them in the code. Here is my code (Umbraco 4.7):

        public static void GetMediaById(int id)
        {
            dynamic media = new DynamicMedia(id);

            var name = media.name;
            var file = media.umbracoFile;
            var ext = media.umbracoExtension;

            int width = 0;
            int height = 0;
            try
            {
                int.TryParse(media.umbracoWidth, out width);
                int.TryParse(media.umbracoHeight, out height);
            }
            catch
            {
                // Ignore this as some file types won't have a width or height.
            }

            // Get thumbnail crops - how?

        }