.Net 上传图片之前获取图片的宽高

                Stream st = Request.Files[0].InputStream;                  Byte[] buffer = new Byte[st.Length];                 st.Read(buffer, 0, buffer.Length);                 MemoryStream stream = new MemoryStream(buffer);                    Bitmap img = new Bitmap(stream);                 int width = img.Width;                 int height = img.Height;                 stream.Close();                 st.Close();