c#图片旋转,保存图片的时候一定要选择图片保存的格式

来源：互联网发布：中国出口印度的数据编辑：程序博客网时间：2024/06/05 00:26

System.Drawing.Image img = null;

img=RotateImage(System.Drawing.Image.FromStream(postedFile.InputStream));

int Width = img.Width;
int Height = img.Height;

                //设置文件名
                fileNewName = DateTime.Now.ToString("yyyyMMddHHmmssff") + "_" + System.IO.Path.GetFileName(files[0].FileName);
                //保存文件
                img.Save(Server.MapPath("~/sunshineupload/" + Utility.UserId + "/thumbnail/" + fileNewName), ImageFormat.Jpeg);//保存的时候必须添加图片格式，不然图片会很大；

/// 根据图片exif调整方向
        /// </summary>
        /// <param name="sm"></param>
        /// <returns></returns>
        public Image RotateImage(Image tmpbitmap)
        {
            try
            {
                var exif = tmpbitmap.PropertyItems;
                byte orien = 0;
                var item = exif.Where(m => m.Id == 274).ToArray();
                if (item.Length > 0)
                    orien = item[0].Value[0];
                switch (orien)
                {
                    case 2:
                        tmpbitmap.RotateFlip(RotateFlipType.RotateNoneFlipX);//horizontal flip
                        break;
                    case 3:
                        tmpbitmap.RotateFlip(RotateFlipType.Rotate180FlipNone);//right-top
                        break;
                    case 4:
                        tmpbitmap.RotateFlip(RotateFlipType.RotateNoneFlipY);//vertical flip
                        break;
                    case 5:
                        tmpbitmap.RotateFlip(RotateFlipType.Rotate90FlipX);
                        break;
                    case 6:
                        tmpbitmap.RotateFlip(RotateFlipType.Rotate90FlipNone);//right-top
                        break;
                    case 7:
                        tmpbitmap.RotateFlip(RotateFlipType.Rotate270FlipX);
                        break;
                    case 8:
                        tmpbitmap.RotateFlip(RotateFlipType.Rotate270FlipNone);//left-bottom
                        break;
                    default:
                        break;
                }
                Bitmap bitmap = new Bitmap(tmpbitmap);
                tmpbitmap.Dispose();
                return (Image)bitmap;
            }
            catch (Exception E)
            {
                Utility.WriteFileLog("UploadImageMethod" + E.Message, "UploadImages.txt");
                return tmpbitmap;
            }
        }

阅读全文

0 0