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        /// <summary>
        /// 获取原图旋转角度(IOS和Android相机拍的照片)
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static int ReadPictureDegree(string path)
        {
            int rotate = 0;
            try
            {
                using (var image = System.Drawing.Image.FromFile(path, true))
                {
                    foreach (var prop in image.PropertyItems)
                    {
                        if (prop.Id == 0x112)
                        {
                            if (prop.Value[0] == 6)
                                rotate = 90;
                            if (prop.Value[0] == 8)
                                rotate = -90;
                            if (prop.Value[0] == 3)
                                rotate = 180;
                            prop.Value[0] = 1;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                LogUtility.Error("ReadPictureDegree", ex);
            }
            return rotate;
        }

        /// <summary>
        /// 旋转
        /// </summary>
        /// <param name="path"></param>
        /// <param name="rotateFlipType"></param>
        /// <returns></returns>
        public bool KiRotate(string path, RotateFlipType rotateFlipType)
        {
            try
            {
                using (Bitmap bitmap = new Bitmap(path))
                {
                    bitmap.RotateFlip(rotateFlipType);
                    bitmap.Save(path);
                }
                return true;
            }
            catch(Exception ex)
            {
                return false;
            }
        }

解释：



顺时针旋转90度 RotateFlipType.Rotate90FlipNone



逆时针旋转90度 RotateFlipType.Rotate270FlipNone

水平翻转 RotateFlipType.Rotate180FlipY

垂直翻转 RotateFlipType.Rotate180FlipX

调用：

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                string path = @"C:\Users\wangbinbin\Desktop\WebApi和AccessWebApi两个项目(包含图片和文件上传)\AccessWebApi\AccessWebApi\images\25b3452f161450251612829203.jpg";
                int rotate=readPictureDegree(path);
                if (rotate == 90)
                {
                    KiRotate(path, RotateFlipType.Rotate90FlipNone);
                }
                else if (rotate == -90)
                {
                    KiRotate(path, RotateFlipType.Rotate270FlipNone);
                }
                else if (rotate == 180)
                {
                    KiRotate(path, RotateFlipType.Rotate180FlipNone);
                }
            }
        }