多次发布后从Viewbag/tempdata中丢失数据 [英] Losing data from viewbag/tempdata after multiple post

问题描述

我在传递价值时遇到问题.我是MVC的初学者，我读过有关 ViewBag ， TempData 的信息，我知道它不起作用，但我不知道如何使它起作用.我的问题:

I've got problem with passing value. I am beginner in MVC, I read about ViewBag, TempData and I know it shouldn't work but I don't know how to make it work otherway. My problem:

有2种型号:动物和 Visit

在我的AnimalView中，我得到了所有动物的清单，并且得到了这个ActionLink:

in my AnimalView I got list of all animals and I got this ActionLink:

@Html.ActionLink("Add Visit", "Create", "Visit", new { id = item.AnimalID }, null) 

它转到带有ID传递的Create GET方法，我得到一个视图来创建访问，我可以提交它，一切都很好，但是..

it goes to Create GET method with id passed, I get a view to create visit I can submit it and everything is fine but..

例如，如果我没有设置访问时间，则模型不会更新，并且当方法返回到 Create Visit 视图时，我没有AnimalID 已经...可以在发布失败时some1告诉我如何保持该值吗?

for example if I don't set time for visit, model will not update and when method goes back to Create Visit View I don't have AnimalID already... can some1 tell me how to keep this value when post fails?

公共ActionResult创建(int id){动物动物= db.Animals.Find(id);如果(动物==空){返回HttpNotFound();}

public ActionResult Create(int id) { Animal animal = db.Animals.Find(id); if (animal == null) { return HttpNotFound(); }

       TempData["AnimalID"] = id;
        return View();

    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "VisitID,AnimalID,DoctorID,VisitDate,VisitHour,Price,Recognition,Medicines,VisitDescription")] Visit visit)
    {



        if (ModelState.IsValid)
        {
            visit.DoctorID = (int)Session["Doctors"];

            db.Visits.Add(visit);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        return View(visit);
    }

推荐答案

ViewBag和TempData仅保留一个请求的信息.如果modelstate无效，则必须重新设置ViewBag和TempData值.

ViewBag and TempData only retain their information for one request. If the modelstate is not valid, you must re-set the ViewBag and TempData values.

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