无论如何，iPhone图像始终以相同的方式存储手机被保留，但EXIF数据中设置了一个标志，指定图像应该在哪个方向。几乎所有本机OSX应用程序（如iPhoto和Preview）都可以正确读取此EXIF方向标签并自动旋转图像，但几乎所有Windows应用程序和Web浏览器不考虑方向EXIF标记。在保存之前，您必须手动旋转Web服务器上的图像。我不知道您使用哪种Web服务器技术，但执行此操作的C＃代码是：

iPhone images are always stored the same way regardless of how the phone is held, but a flag is set in the EXIF data that specifies which orientation the image should be in. Almost all native OSX applications such as iPhoto and Preview can read this EXIF orientation tag correctly and rotates the image automatically, but almost all Windows applications and web browsers don't take the orientation EXIF tag into account. You'll have to manually rotate the image on the web server before saving it. I don't know which web server technology you use, but the C# code to do this is:

public static void FixOrientation(this Image image)
{
    // 0x0112 is the EXIF byte address for the orientation tag
    if (!image.PropertyIdList.Contains(0x0112))
    {
        return;
    }

    // get the first byte from the orientation tag and convert it to an integer
    var orientationNumber = image.GetPropertyItem(0x0112).Value[0];

    switch (orientationNumber)
    {
        // up is pointing to the right
        case 8:
            image.RotateFlip(RotateFlipType.Rotate270FlipNone);
            break;
        // up is pointing to the bottom (image is upside-down)
        case 3:
            image.RotateFlip(RotateFlipType.Rotate180FlipNone);
            break;
        // up is pointing to the left
        case 6:
            image.RotateFlip(RotateFlipType.Rotate90FlipNone);
            break;
        // up is pointing up (correct orientation)
        case 1:
            break;
    }
}