Question

我在尝试编辑时遇到问题。我与Areas合作以更好地管理应用程序。问题出在“管理员”这个区域。

接下来是控制器代码（OfficeControlle），我使用先前创建的会话变量和函数来编辑我得到的模型数据。

public ActionResult Edit()
        {
            decimal id;
            id = (decimal)Session["consul"];
            CAMPUS_UNIVERSITY campus_university = db. CAMPUS_UNIVERSITY.Single(s => s.Idoffice == id);
            ViewData.Model = db.OFFICE.Single(c => c.Idoffice == id);
            ViewBag.University = db.UNIVERSITY.Single(u => u.IdUniversity == campus_university.IdUniversity);
            ViewBag.campus = db.CITY_CAMPUS.Single(u => u.IdCity == campus_university.Idcitycampus);
            return View(sede_universidad);
        }

         [HttpPost]
        public ActionResult Edit(CAMPUS_UNIVERSITY campus_university, OFFICE office)
        {
            if (ModelState.IsValid)
            {
                db.CAMPUS_UNIVERSITY.Attach(campus_university);
                db.ObjectStateManager.ChangeObjectState(campus_university, EntityState.Modified);
                db.SaveChanges();

                db. OFFICE.Attach(office);
                db.ObjectStateManager.ChangeObjectState(office, EntityState.Modified);
                db.SaveChanges();

                return RedirectToAction("Index");
            }
            ViewBag.IdCitycampus = new SelectList(db.CITY_CAMPUS, "IdCity", "Name", campus_university.IdCitycampus);
            ViewBag.IdConsultorio = new SelectList(db.OFFICE, "Idoffice", "addressoffice", campus_university.Idoffice);
            ViewBag.IdUniversidad = new SelectList(db.UNIVERSITY, "IdUniversity", "Name", campus_university.IdUniversity);
            return View(campus_university);
        }

接下来是视图代码

@model RolMVC3.Models.CAMPUS_UNIVERSITY

@{
    ViewBag.Title = "Edit"; 
}

<h2>edit</h2>

<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>

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

    <h2> @ViewBag.University.Name - @ViewBag.Campus.Name </h2>

    <fieldset>
        <legend>OFFICE</legend>

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

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

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

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

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

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

        <fieldset>
        <legend>OTHER DATE</legend>
        @Html.Partial("_office", Model.OFFICE)
        </fieldset>

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

<div>
    @Html.ActionLink("back", "Index")
</div>

当我按“保存”按钮时出现问题，出现以下错误：

参数字典包含非可空类型参数'Id'的空条目''System.Decimal''，用于''RolMVC3中的方法''System.Web.Mvc.ActionResult Index（System.Decimal）'。 Areas.Administrator.Controllers.OfficeController ''

Answer 1

当你在这里重定向时：

return RedirectToAction("Index");

确保在查询字符串中传递id，因为看起来您的Index操作需要它作为参数：

return RedirectToAction("Index", new { id = campus_university.IdUniversity });

Answer 2

我假设您的索引操作方法看起来像这样（如果我错了请纠正我）：

public ActionResult Index(decimal id)
{
     // Your method's code
}

因此，在您执行return RedirectToAction("Index");的情况下，您正尝试重定向到不带参数的操作方法。但在这种情况下，有一个需要参数的动作方法，即id。因此，在重定向时，您需要更改代码并提供此id parameter。

这是你可以做的：

return RedirectToAction("Index", new { id = /* put your id here */ });

编辑模型时不方便

2 个答案: