asp.net-mvc-3 – 在MVC中的Http Post之后渲染相同的视图

继承人控制器……

public ActionResult Upload()
    {
        VMTest vm = new VMTest();
        return View(vm);
    }

    [HttpPost]
    public ActionResult Upload(VMTest vm,String submitButton)
    {
        if (submitButton == "Upload")
        {
            //do some processing and render the same view
            vm.FileName = "2222";           // dynamic creation of filename
            vm.File.SaveAs(@vm.FileName);   // save file to server
            return View(vm);
        }
        else if (submitButton == "Save")
        {
            //read the file from the server
            FileHelperEngine engine = new FileHelperEngine(typeof(PaymentUploadFile));
            PaymentUploadFile[] payments = (PaymentUploadFile[])engine.ReadFile(@vm.FileName);  // the problem lays here @vm.FileName has no value during upload

            //save the record of the file to db
            return View("Success");
        }
        else
        {
            return View("Error");
        }
    }

我的视图中已经有一个@ Html.HiddenFor(model => Model.FileName).

但我仍然得到Model.FileName的空值.

任何帮助请

谢谢