调整大小后旋转图像

Question

我有下面的代码，以便将图像调整为适当的尺寸（600,600） 它工作正常，但对于某些像这样的图像（720 * 1280），结果将旋转（90度） 我怎么知道哪些图像会旋转？以及如何防止这种情况？

StackOverflow也旋转图像

     public static System.Drawing.Image FixedSize(Image image, int Width,   int Height, bool needToFill)
    {
        #region calculations
        int sourceWidth = image.Width;
        int sourceHeight = image.Height;
        int sourceX = 0;
        int sourceY = 0;
        double destX = 0;
        double destY = 0;

        double nScale = 0;
        double nScaleW = 0;
        double nScaleH = 0;

        nScaleW = ((double)Width / (double)sourceWidth);
        nScaleH = ((double)Height / (double)sourceHeight);
        if (!needToFill)
        {
            nScale = Math.Min(nScaleH, nScaleW);
        }
        else
        {
            nScale = Math.Max(nScaleH, nScaleW);
            destY = (Height - sourceHeight * nScale) / 2;
            destX = (Width - sourceWidth * nScale) / 2;
        }

        if (nScale > 1)
            nScale = 1;

        int destWidth = (int)Math.Round(sourceWidth * nScale);
        int destHeight = (int)Math.Round(sourceHeight * nScale);
        #endregion

        System.Drawing.Bitmap bmPhoto = null;
        try
        {
            bmPhoto = new System.Drawing.Bitmap(destWidth + (int)Math.Round(2 * destX), destHeight + (int)Math.Round(2 * destY));
        }
        catch (Exception ex)
        {
            throw new ApplicationException(string.Format("destWidth:{0}, destX:{1}, destHeight:{2}, desxtY:{3}, Width:{4}, Height:{5}",
                destWidth, destX, destHeight, destY, Width, Height), ex);
        }
        using (System.Drawing.Graphics grPhoto = System.Drawing.Graphics.FromImage(bmPhoto))
        {
            grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;
            grPhoto.CompositingQuality = CompositingQuality.HighQuality;
            grPhoto.SmoothingMode = SmoothingMode.HighQuality;

            Rectangle to =  new System.Drawing.Rectangle((int)Math.Round(destX), (int)Math.Round(destY), destWidth, destHeight);
            Rectangle from = new System.Drawing.Rectangle(sourceX, sourceY, sourceWidth, sourceHeight);
            //Console.WriteLine("From: " + from.ToString());
            //Console.WriteLine("To: " + to.ToString());
            grPhoto.DrawImage(image, to, from, System.Drawing.GraphicsUnit.Pixel);

            return bmPhoto;
        }
    }

首先，我想避免这种情况，如果无法实现，我想将图像重新旋转为真实形状