Question

我试图在for IList<Hole>中收集数据后将视图中的loop ViewModel发送到控制器以传递给方法，但是，传递的ViewModel仍然是空值。我错过了什么没有将ViewModel从View传递给Controller？

我的ViewModel是：

public class HoleViewModel : IEnumerable
    {
        public int FacilityId { get; set; }
        public int CourseId { get; set; }
        //public Hole Hole { get; set; }

        public IList<Hole> Holes { get; set; }


        public IEnumerator GetEnumerator()
        {
            throw new NotImplementedException();
        }
    }

我的观点是：

@using GT_App.Models
@model GT_App.ViewModel.HoleViewModel

....

<form method="post" action="/Hole/Create">
    <fieldset>
        <div>
            @{
                var holeCount = 4;
            }
            <table style="display: inline">
                <thead>
                    <th>Number</th>
                    <th>Yardage</th>
                    <th>Par</th>
                    <th>Hdcp</th>
                </thead>
                @for (int i = 0; i < holeCount; i++)
                {
                    <tr>
                        <td>
                            @Html.TextBoxFor(m => m.Holes[i].Number)
                        </td>
                        <td>
                            @Html.TextBoxFor(m => m.Holes[i].Yardage)
                        </td>
                        <td>
                            @Html.TextBoxFor(model => model.Holes[i].Par)
                        </td>
                        <td>
                            @Html.TextBoxFor(model => model.Holes[i].Handicap)
                        </td>
                    </tr>
                }

            </table>
        </div>
        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>

</form>

我的控制器是：

public ActionResult Create()
        {
            ViewBag.FacilityId = new SelectList(db.Facilities, "FacilityId", "Name");
            ViewBag.CourseId = new SelectList(db.Courses, "CourseId", "Name");
            return View();
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(HoleViewModel holes)
        {
            if (ModelState.IsValid)
            {
                for (int i = 0; i < holes.Holes.Count; i++)
                {

                    var item = new Hole();
                    if (Session["FacilityId"] != null || Convert.ToInt32(Session["FacilityId"]) != 0)
                    {
                        item.FacilityId = Convert.ToInt32(Session["FacilityId"]);
                    }
                    if (Session["CourseId"] != null || Convert.ToInt32(Session["CourseId"]) != 0)
                    {
                        item.CourseId = Convert.ToInt32(Session["CourseId"]);
                    }
                    item.Number = Convert.ToInt32(Request.Form["Number" + i]);
                    item.Yardage = Convert.ToInt32(Request.Form["Yardage" + i]);
                    item.Par = Convert.ToInt32(Request.Form["Par" + i]);
                    item.Handicap = Convert.ToInt32(Request.Form["Handicap" + i]);
                    holes.Holes.Add(item);

                }

                // itterate thru collection to add individual holes to Entity
                foreach (Hole hole in holes)
                {
                    db.Holes.Add(hole);
                    db.SaveChanges();
                }

                //return RedirectToAction("Index");
            }

            ViewBag.CourseId = new SelectList(db.Courses, "CourseId", "Name", Session["CourseId"]);
            //return View(Session["CourseId"]);

            return RedirectToAction("Index");
        }

Answer 1

如果您的第二个Create操作中出现模型验证错误，那么通常您会使用提交的模型再次返回视图，然后会在网页上显示验证错误。

您没有这样做 - 无论模型是否有效，您都会重定向到Index操作。我会在调用RedirectToAction之后立即拨打SaveChanges电话，然后在方法return View(holes);的结尾处。{/ p>

哦，我不会把SaveChanges调用放在循环中。在循环之后执行此操作。该代码还有其他问题，但我会停在那里......： - ）

查看未将ViewModel发送到Controller

1 个答案: