RedirectToAction 正在传递一个空对象

Question

我正在将代码 sn-p 粘贴到 c# 控件的下方。我无法弄清楚的是，我正在添加到 AddPerson 的 formViewModel 已正确填充，但是当我调用 RedirectToAction 到下面的“SaveForm”方法并传递 formViewModel 时，它在“ SaveForm”方法。

对我不理解的内容有什么建议吗？

谢谢，

            [HttpPost]
        public IActionResult AddPerson(GikFormViewModel formViewModel)
        {
            if(formViewModel.Items == null)
            {
                //formViewModel.Items.Add(new GikItemViewModel() { })
                formViewModel.Items = new List<GikItemViewModel>();
            }
            if (!ModelState.IsValid)
            {
                return View("Index", formViewModel);
            }

        // REDIRECTING HERE TO "SaveForm" Formatting is not properly done

            return RedirectToAction("SaveForm", formViewModel);
            //return View("Index", formViewModel);
        }

        public IActionResult SaveForm(GikFormViewModel formViewModel)
        {
            var person = formViewModel.Person;
            var items = formViewModel.Items;
            var gikItems = new Collection<Gikitem>();
            //var gikPerson = new Gikperson();
            //var gikItem = new Gikitem();
            var gikPerson = new Gikperson()
            {
                Organization = person.Organization,
                Title = person.Title,
                Name = person.FirstName + " " + person.LastName,

                AddressLineOne = person.AddressLineOne,
                AddressLineTwo = person.AddressLineTwo == null ? null : person.AddressLineTwo,
                City = person.City,
                State = person.State,
                Zipcode = person.Zipcode,
                Phone = person.Phone,
                DoNoContact = person.DoNotContact == true ? 1 : 2,
                Email = person.Email
            };

Answer 1

尝试使用TempData。

ASP.NET MVC 中的TempData 可用于存储临时数据，可用于后续请求。 TempData 将在后续请求完成后被清除。

AddPerson 操作

[HttpPost]
public IActionResult AddPerson(GikFormViewModel formViewModel)
{
    if(formViewModel.Items == null)
    {
        //formViewModel.Items.Add(new GikItemViewModel() { })
        formViewModel.Items = new List<GikItemViewModel>();
    }
    if (!ModelState.IsValid)
    {
        return View("Index", formViewModel);
    }

    //Save the model into the TempData object.
    TempData["model] = formViewModel;

    return RedirectToAction("SaveForm");
    //return View("Index", formViewModel);
}

SaveForm 操作

public IActionResult SaveForm()
{
    //If TempData doesn't contains your model then return error message or something.
    if(!TempData.ContainsKey("model"))
        return new HttpNotFoundResult();

    //Retrieve the model from TempData object.
    var formViewModel = TempData["model"] as GikFormViewModel;

    var person = formViewModel.Person;
    var items = formViewModel.Items;
    var gikItems = new Collection<Gikitem>();
    ...
}