0

我有以下视图模型：

public class CreateCardViewModel
    {
        [HiddenInput(DisplayValue = false)]
        public int SetId { get; set; }

        [Required]
        public ICollection<Side> Sides { get; set; }

        [Required]
        [DataType(DataType.Date)]
        public DateTime DateCreated { get; set; }

        [Required]
        public bool IsReady { get; set; }

    }

以及为创建定义的以下操作：

[HttpGet]
        public ActionResult Create(int setId)
        {
            var model = new CreateCardViewModel();

            // attach card to current set
            model.SetId = setId;

            // create a new Side
            var side = new Side() {Content = "Blank Side"};

            // Add this to the model's Collection
            model.Sides = new Collection<Side> { side };

            return View(model);
        }

        [HttpPost]
        public ActionResult Create(CreateCardViewModel viewModel)
        {
            if (ModelState.IsValid)
            {
                var set = _db.Sets.Single(s => s.SetId == viewModel.SetId);
                var card = new Card {Sides = viewModel.Sides};

                set.Cards.Add(card);

                _db.Save();
            }
            return View(viewModel);


        }

当我尝试创建新卡时，viewModel 的 Sides 属性为空，因此 ModelState 出现为空。我不太明白为什么最初的 Side 没有通过模型。

我的视图如下所示：

<h2>Create</h2>

@using (Html.BeginForm()) {
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>CreateCardViewModel</legend>

        <div class="editor-label">
            @Html.LabelFor(model => model.SetId)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.SetId)
            @Html.ValidationMessageFor(model => model.SetId)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.DateCreated)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.DateCreated)
            @Html.ValidationMessageFor(model => model.DateCreated)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.IsReady)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.IsReady)
            @Html.ValidationMessageFor(model => model.IsReady)
        </div>

        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
}
4

2 回答 2

1

您的视图中没有任何内容绑定到Sides您的 ViewModel 的属性。如果表单中没有任何内容来保存该属性的值，则在发生模型绑定时它将为空。您需要以某种方式捕获Side表单中的 - 您如何添加/删除此属性？通过应该在表单上进行的用户交互？

于 2013-02-10T19:23:47.090 回答
0

尝试在 Create() 类型上添加第二个参数ICollection<Side>，看看是否有任何东西传递给它。

于 2013-02-10T19:10:43.873 回答