Question

我正在关注www.asp.net上的教程，并且我已经尝试对结果表进行排序了。但是，一旦我点击链接命令他们排序，它就不会排序。任何人都可以帮忙吗？

控制器：

 public ActionResult Index(string sortOrder)
        {
            ViewBag.FirstNameSortParm = String.IsNullOrEmpty(sortOrder) ? "firstName_desc" : "";
            ViewBag.MiddleNameSortParm = String.IsNullOrEmpty(sortOrder) ? "middleName_desc" : "";
            ViewBag.LastNameSortParm = String.IsNullOrEmpty(sortOrder) ? "lastName_desc" : "";
            ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";

            var students = from s in db.Students
                           select s;

            switch (sortOrder)
            {
                 case "firstName_desc":
                    students = students.OrderByDescending(s => s.FirstName);
                    break; 
                case "middleName_desc":
                    students = students.OrderByDescending(s => s.MiddleName);
                    break;
                case "lastName_desc":
                    students = students.OrderByDescending(s => s.LastName);
                    break;
                case "Date":
                    students = students.OrderBy(s => s.EnrollmentDate);
                    break;
                case "date_desc":
                    students = students.OrderByDescending(s => s.EnrollmentDate);
                    break;
                default:
                    students = students.OrderBy(s => s.LastName);
                    break;
            }

            return View(db.Students.ToList());
        }

查看：

<table class="table">
    <tr>
        <th>
           @Html.ActionLink("First Name", "Index", new { sortOrder = ViewBag.FirstNameSortParm })
        </th>
        <th>
            @Html.ActionLink("Middle Name", "Index", new { sortOrder = ViewBag.MiddleNameSortParm })
        </th>
        <th>
            @Html.ActionLink("Last Name", "Index", new { sortOrder = ViewBag.LastNameSortParm })
        </th>
        <th>
            @Html.ActionLink("Enrollment Date", "Index", new { sortOrder = ViewBag.DateSortParm })
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.FirstName)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.MiddleName)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.LastName)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.EnrollmentDate)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.ID }) |
            @Html.ActionLink("Details", "Details", new { id=item.ID }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.ID })
        </td>
    </tr>
}

</table>

Answer 1

自己发现了这个问题。问题在于这行代码：

return View(db.Students.ToList());

答案应该是：

return View(students.ToList());

这是因为我从数据库中检索我的结果，告诉程序对名称进行排序，然后我返回数据库中的名称，而不是返回包含排序说明的对象学生。

表排序不起作用

1 个答案: