如何在C#中更改两个记录的字段值

在我的显示网格数据的项目中，我按优先级排序，用户可以按箭头（向下、向上）更改记录优先级。对于更改优先级，我使用以下代码：

    public virtual JsonResult ChangeOrder(int selectedCode, bool isUp)
    {
        var NewsObj = _newsService.Get(selectedCode);
        if (NewsObj == null)
            return Json(new { result = false, message = "error" });
        int CurrentPriority = NewsObj.Priority;
        int OtherPriority = 0;
        if (isUp)
        {
            OtherPriority = CurrentPriority - 1;
        }
        else
        {
            OtherPriority = CurrentPriority + 1;
        }
        var OtherNews = _newsService.GetByPriority(OtherPriority);
        if (OtherNews == null)
            return Json(new { result = false, message = "error" });
        int tmp = NewsObj.Priority;
        NewsObj.Priority = OtherNews.Priority;
        OtherNews.Priority = tmp;
        _uow.MarkAllAsChanges(NewsObj);
        _uow.MarkAllAsChanges(OtherNews);
        _uow.SaveAllChanges();
        return Json(new { result = true, message = "success" });
    }

但这些代码取决于排序，例如，当我使用OrdeyByDesc时，这一行不起作用，因为--和++应该更改。我想独立于此。