图片旋转

byte[] imageCONTENT = File.ReadAllBytes(imagePath);
System.IO.MemoryStream byteMS = new System.IO.MemoryStream(imageCONTENT);
System.Drawing.Image img = System.Drawing.Image.FromStream(byteMS);
img.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
string sFileEXT = System.IO.Path.GetExtension(imageName);
string sFileMimeType = Utils.GetFileContentType(sFileEXT);
byte[] result = APSqlProcs.TiffToByteArray(img, sFileMimeType);