C ＃ detect whether the picture is rotated and modified to the true rotation

C# Check whether the picture is rotated and modified to the true rotation

One 、 Using jpg Merge pdf Found a lot of image rotation in the process , It's normal to open the rotating photos with the picture viewing software , After comparison, I found these photos image.PropertyItems.Value[0] The value is different from the photo without rotation . Therefore, the following function processing is written .

   /// <summary>
        /// C#  Check whether the picture is rotated and modified to the true rotation 
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static bool readPictureDegreeAndKiRotate(string path)
        {
    
            bool bl = false;
            try
            {
    
                // Get the angle of rotation 
                int rotate = 0;
                using (var image = System.Drawing.Image.FromFile(path))
                {
    
                    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;
                        }
                    }
                }

                // Rotate the picture 

                using (Bitmap bitmap = new Bitmap(path))
                {
    
                    RotateFlipType rotateFlipType = new RotateFlipType();
                    if (rotate == 90)
                    {
    
                        rotateFlipType = RotateFlipType.Rotate90FlipNone;
                        bitmap.RotateFlip(rotateFlipType);
                        bitmap.Save(path);
                    }
                    else if (rotate == -90)
                    {
    
                        rotateFlipType = RotateFlipType.Rotate270FlipNone;
                        bitmap.RotateFlip(rotateFlipType);
                        bitmap.Save(path);
                    }
                    else if (rotate == 180)
                    {
    
                        rotateFlipType = RotateFlipType.Rotate180FlipNone;
                        bitmap.RotateFlip(rotateFlipType);
                        bitmap.Save(path);
                    }
                    
                    bitmap.Dispose();
                }

                bl = true;

            }
            catch (Exception ex)
            {
    
              
                bl = false;
            }
            return bl;
        }