Question

我有查看我在哪里创建面试问候和详细信息

这是表格

CREATE TABLE [dbo].[Interviews] (
[Interview_Id] INT            IDENTITY (1, 1) NOT NULL,
[Greeting]     NVARCHAR (MAX) NULL,
[Detail]       NVARCHAR (MAX) NULL,
[VacancyId]    INT            NULL,
PRIMARY KEY CLUSTERED ([Interview_Id] ASC),
CONSTRAINT [FK_Interviews_ToTable] FOREIGN KEY ([VacancyId]) REFERENCES [dbo].[Vacancies] ([VacancyId]) ON DELETE CASCADE

）;

以下是此视图的控制器

  // Страница ввода приветствия и описания вакансии
    [HttpGet]
    public ActionResult WelcomeScreen()
    {
        // Формируем список команд для передачи в представление
        SelectList teams = new SelectList(db.Vacancy, "VacancyId", "VacancyName");
        ViewBag.Teams = teams;

        return View();
    }


    //Заносим инфу о вакансии в таблицу
    [HttpPost]
    public ActionResult WelcomeScreen(Interview interview)
    {
        db.Interview.Add(interview);
        db.SaveChanges();
        //Int32 id = interview.Interview_Id;
        //TempData["id"] = id;

        return RedirectToAction("Index", "Questions", new { id = interview.Interview_Id });
    }

这是我的观点

    @using (Html.BeginForm())
{
    <div class="outer-div">
        <div class="inner-div">
            <div class="right-welcome-div">
                <div class="right-grid-in-grid">

                    <div class="col-md-10">
                        @Html.DropDownListFor(model => model.Vacancy.VacancyId, ViewBag.Teams as SelectList, new { @class = "greeting" })
                        @Html.ValidationMessageFor(model => model.VacancyId, "", new { @class = "text-danger" })
                    </div>

                </div>
                <div class="main-left-div">

                    <div style="margin-left: 40px">
                        @Html.EditorFor(model => model.Greeting, new {htmlAttributes = new {@class = "greeting", data_bind = "textInput: Greeting", placeholder = "Приветствие", id="Greeting"}})
                    </div>

                    @Html.TextAreaFor(model => model.Detail, new { @class = "greeting2", data_bind = "textInput: Detail" })

                </div>
             </div>
            <div class="left-welcome-div">
                <div class="text-div" style="padding-top: 30px; word-break: break-all;">
                    <p style="font-size: 20px; margin-top: 20px; padding-left: 30px; padding-right: 40px; text-align: center;"><b><span data-bind="text: Greeting"/></b>
                    </p>
                    <p style="font-size: 20px; margin-top: 40px; padding-left: 30px; padding-right: 40px; text-align: center;"><span data-bind="text: Detail"/>
                    </p>
                </div>
                <div class="button-div" style="padding-top: 40px;">
                    <input  style="float: right; margin-right: 30px; margin-top: 20px; border-radius: 12px; width: 200px;" type="submit" value="Создать" class="btn btn-default" />
                    </div>
            </div>
        </div>
    </div>
    <script type="text/javascript">
        function ViewModel() {
            this.Greeting = ko.observable('');
            this.Detail = ko.observable('');
        };

        var vm = new ViewModel();
        ko.applyBindings(vm);

    </script>
}

当我点击提交按钮时，它会在Vacancies表中创建新的空行。

我不明白，为什么？

为什么会这样？

Answer 1

因为您根据以下代码生成名为Vacancy.VacancyId的dropDownList，它将在Interview的属性中创建Vacancy实例，当您在dbContext中添加Interview时，EF将为Vacancy创建新行，因为interview.Vacancy不为null

@Html.DropDownListFor(model => model.Vacancy.VacancyId, ViewBag.Teams as SelectList, new { @class = "greeting" })

用此

替换代码

@Html.DropDownListFor(model => model.VacancyId, ViewBag.Teams as SelectList, new { @class = "greeting" })

在表中生成一个新字段（ASP.NET MVC）

1 个答案: