Question

我是MVC 4的新手。

我收到以下错误：

Object reference not set to an instance of an object. Line 47:@Html.ActionLink("Back to List", "Index", new { id = Model.RestaurantId })

以下是导致错误的观点（请参阅最后几行）：

@model OdeToFood.Models.RestaurantReview

@{
    ViewBag.Title = "Create";
}

<h2>Create</h2>

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

    <fieldset>
        <legend>New Review</legend>

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

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

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

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

<div>
    @Html.ActionLink("Back to List", "Index", new { id = Model.RestaurantId })
</div>

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

这是我在单击“返回列表”链接时调用的控制器操作：

public ActionResult Index([Bind(Prefix="id")]int restaurantId)
{
    var restaurant = _db.Restaurants.Find(restaurantId);
    if (restaurant != null) {
        return View(restaurant);
    }
    return HttpNotFound(); 
}

以下是在视图中强烈输入的RestaurantReview模型：

public class RestaurantReview
{
    public int Id { get; set; }
    public int Rating { get; set; }
    public string Body { get; set; }
    public string ReviewerName { get; set; }
    public int RestaurantId { get; set; }
}

非常感谢任何帮助。

干杯！

Answer 1

在您的代码中，您显示的是Create视图和Index控制器。检查Create控制器中是否通过Model，或检查是否需要型号。

将模型数据从视图传递到控制器会导致错误

1 个答案: