C#实现图片翻转

 

 public void GetImg()
    {
        Bitmap bm = new Bitmap(Server.MapPath(@"~/qq.jpg"));
        int w = 100;
        int h = 300;
        
        int[] r = new int[] { 2, 3, 4, 5, 6, 7, 8 };
        Random ran = new Random();
        int i=ran.Next(6);
        int orien = r[i];

        rotating(bm, ref w, ref h, orien);
        bm.Save(Server.MapPath(@"~/qq2.jpg"));
        Image1.ImageUrl = "~/qq2.jpg"; 
        
    }

    public void rotating(Bitmap img, ref int width, ref int height, int orien)
    {
        int ow = width;
        switch (orien)
        {
            case 2:
                img.RotateFlip(RotateFlipType.RotateNoneFlipX);//horizontal flip     
                break;
            case 3:
                img.RotateFlip(RotateFlipType.Rotate180FlipNone);//right-top     
                break;
            case 4:
                img.RotateFlip(RotateFlipType.RotateNoneFlipY);//vertical flip     
                break;
            case 5:
                img.RotateFlip(RotateFlipType.Rotate90FlipX);
                break;
            case 6:
                img.RotateFlip(RotateFlipType.Rotate90FlipNone);//right-top     
                width = height;
                height = ow;
                break;
            case 7:
                img.RotateFlip(RotateFlipType.Rotate270FlipX);
                break;
            case 8:
                img.RotateFlip(RotateFlipType.Rotate270FlipNone);//left-bottom     
                width = height;
                height = ow;
                break;
            default:
                break;
        }
    }