ASP.NET MVC 4 Create 方法有空对象

Question

我在创建对象时遇到问题，但我不知道为什么。我在 Post Create 方法的参数中有空对象，在 ModelState 中出现此错误：

{System.InvalidOperationException: 参数从类型转换 'System.String' 键入 'BlanskoMenu.Models.ActionOffer' 失败 因为没有类型转换器可以在这些类型之间进行转换。在 System.Web.Mvc.ValueProviderResult.ConvertSimpleType（CultureInfo 文化，对象值，类型destinationType）在 System.Web.Mvc.ValueProviderResult.UnwrapPossibleArrayType（CultureInfo 文化，对象值，类型destinationType）在 System.Web.Mvc.ValueProviderResult.ConvertTo（类型类型，CultureInfo 文化）在 System.Web.Mvc.DefaultModelBinder.ConvertProviderResult（ModelStateDictionary 模型状态，字符串模型状态键，值提供者结果 valueProviderResult, 类型 destinationType)}

这些是我在控制器中的方法：

    //
    // GET: /Action/

    public ActionResult Index()
    {
        var offers = _repository.GetAllActionOffers();
        return View(offers);
    }

    //
    // GET: /Action/Create

    public ActionResult Create()
    {
        return View();
    }

    //
    // POST: /Action/Create

    [HttpPost]
    public ActionResult Create(ActionOffer action)
    {
        try
        {
            if (ModelState.IsValid)
            {
                _repository.CreateActionOffer(action);
                return RedirectToAction("Index");
            }
            return View(action);
        }
        catch
        {
            return View(action);
        }
    }

这是我的 ActionOffer 模型：

public class ActionOffer
{
    [Key]
    public int Id { get; set; }
    public string Text { get; set; }
    public string Title { get; set; }
    public string ImagePath { get; set; }
    [DataType(DataType.Date)]
    public DateTime StartDate { get; set; }
    [DataType(DataType.Date)]
    public DateTime EndDate { get; set; }
}

这是我的创建视图：

@model BlanskoMenu.Models.ActionOffer

@{
    ViewBag.Title = "Vytvořit akční nabídku";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Vytvořit akční nabídku</h2>

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

    <fieldset>
        <legend>Akční nabídka</legend>

        @Html.HiddenFor(model => model.Id)

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

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

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

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

        <div class="editor-label">
            @Html.LabelFor(model => model.EndDate)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.EndDate)
            @Html.ValidationMessageFor(model => model.EndDate)
        </div>
        <p>
            <input type="submit" value="Save" />
        </p>
    </fieldset>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

感谢您的帮助

Answer 1

尝试改变

public ActionResult Create(ActionOffer action)

到

public ActionResult Create(ActionOffer actionOffer)