问FormCollection的理由是什么？这是一个虚假的参数吗？

EN

    public ActionResult Edit(int id)
    {
        Dinner dinner = dinnerRepository.GetDinnerById(id);

        if (dinner == null)
            return View("NotFound");
        else
            return View(dinner);
    }

    [HttpPost]
    public ActionResult Edit(int id, object dummy/*, FormCollection collection*/)
    {
        Dinner temp = dinnerRepository.GetDinnerById(id);

        if (TryUpdateModel(temp))
        {
            dinnerRepository.Save();

            return RedirectToAction("Details", new { id = temp.DinnerId });
        }
        else
            return View(temp);
    }