相对于EXIF方向标记

Question

PictureBox和普通位图对象没有考虑EXIF Orientation Tag.Most现代相机现在将EXIF信息添加到Images.Im使用以下自定义函数来解决这个问题

Image FixImageOrientation(Image srce)
{
    const int ExifOrientationId = 0x112;
    // Read orientation tag
    if (!srce.PropertyIdList.Contains(ExifOrientationId)) return srce;
    var prop = srce.GetPropertyItem(ExifOrientationId);
    var orient = BitConverter.ToInt16(prop.Value, 0);
    // Force value to 1
    prop.Value = BitConverter.GetBytes((short)1);
    srce.SetPropertyItem(prop);

    // Rotate/flip image according to <orient>
    switch (orient)
    {
        case 1:
            srce.RotateFlip(RotateFlipType.RotateNoneFlipNone);
            return srce;


        case 2:
            srce.RotateFlip(RotateFlipType.RotateNoneFlipX);
            return srce;

        case 3:
            srce.RotateFlip(RotateFlipType.Rotate180FlipNone);
            return srce;

        case 4:
            srce.RotateFlip(RotateFlipType.Rotate180FlipX);
            return srce;

        case 5:
            srce.RotateFlip(RotateFlipType.Rotate90FlipX);
            return srce;

        case 6:
            srce.RotateFlip(RotateFlipType.Rotate90FlipNone);
            return srce;

        case 7:
            srce.RotateFlip(RotateFlipType.Rotate270FlipX);
            return srce;

        case 8:
            srce.RotateFlip(RotateFlipType.Rotate270FlipNone);
            return srce;

        default:
            srce.RotateFlip(RotateFlipType.RotateNoneFlipNone);
            return srce;
    }
}

以上代码无法正常工作，除非我从文件路径

继续创建新的位图

image = (Bitmap)FixImageOrientation(Bitmap.FromFile(path));

如果我像这样使用

image = (Bitmap)FixImageOrientation(myimage);

它不起作用！我做错了什么？我怎样才能解决这个问题？还有其他更好的方法吗？