Question

我有一个用户输入他/她的详细信息的表单。

                @using (Html.BeginForm("Create","Coupons"))
            {
                <div class="row">
                    <div class="col-sm-8">
                        <div class="page-header">Generer Coupon</div>
                    </div>
                </div>
                <div class="row">
                    <div class="col-sm-4">
                        @Html.AntiForgeryToken()
                        <div class="form-group">
                            @Html.LabelFor(m => m.Student)
                            @Html.DropDownListFor(m => m.Student, new SelectList(Model.Students, "Id", "Name"), "", new { @class = "form-control input-lg" })

                        </div>
                    </div>
                </div>
                <div class="row">
                    <div class="col-sm-4">
                        @Html.AntiForgeryToken()
                        <div class="form-group">
                            @Html.LabelFor(m => m.Price)
                            @Html.TextBoxFor(m => m.Price, new { @class = "form-control input-lg" })
                        </div>
                    </div>
                </div>
                <div class="row">
                    <div class="col-sm-4">
                        @Html.AntiForgeryToken()
                        <div class="form-group">
                            @Html.LabelFor(m => m.NumberOfCoupons)
                            @Html.TextBoxFor(m => m.NumberOfCoupons, new {@class = "form-control input-lg"})
                        </div>
                    </div>
                </div>
                <div class="row">
                    <div class="col-sm-4">
                        <button class="btn btn-success btn-lg">Generer</button>
                    </div>
                </div>
            }

我将视图重定向到CouponsController上的Create Method

        [HttpPost]
    public ActionResult Create(CouponViewModel viewModel)
    {
        if (!ModelState.IsValid)
        {
            var model = new CouponViewModel
            {
                Students = _context.Students.ToList()
            };
            return View("Index", model);
        }

        for (int i = 1; i <= viewModel.NumberOfCoupons; i++)
        {
            var coupon = new Coupon
            {
                CouponNumber = viewModel.CouponNumber,
                ValidationCode = viewModel.ValidationCode(6),
                Price = viewModel.Price,
                StudentId = viewModel.Student,
                DateTime = Convert.ToDateTime(DateTime.Now.ToString("yy-MMM-dd ddd"))
            };

            _context.Coupons.Add(coupon);

            _context.SaveChanges();

        }

        var coupons = _context.Coupons
           .Where(c => c.StudentId == viewModel.Student)
           .Include(s => s.Student)
           .ToList();

        TempData["viewModel"] = coupons;
        return RedirectToAction("GetCoupons");
    }

这是我收到要在视图上显示的tempdata的视图

        [HttpPost]
    public ActionResult GetCoupons()
    {
        Coupon coupon = TempData["viewModel"] as Coupon;

        return View("Print", (IEnumerable<Coupon>)coupon);
    }

我被困了3天。我不知道我错在哪里

Answer 1

您的示例存在一些问题。但如果你采取不同的做法，你可以消除它们。

map.keys.map(_.stripPrefix("dealership_id_").toInt).max // 39

首先，您的重定向操作需要标记为[HttpPost] public ActionResult Create(CouponViewModel viewModel) { return RedirectToAction("GetCoupons", new { studentId = viewModel.Student }); }。如果在查询字符串上传递id，则还可以避免[HttpGet]，然后在重定向的操作中执行查找。

TempData

[HttpGet] public ActionResult GetCoupons(int studentId) { var coupons = _context.Coupons .Where(c => c.StudentId == studentId) .Include(s => s.Student) .ToList(); return View("Print", coupons); }并没有错，但它不会在刷新时继续存在。有时您会传递敏感数据，这使得它很有用。您投放到单个TempData的投射并不是您想要的 - 转而投射到集合。

Coupon

在用户提交表单

1 个答案: