CRUD筛选/排序在asp.net中不起作用

Question

我有需要排序/过滤的数据库。 我当前的代码未显示任何错误，但也没有执行任何操作。

ApplicationUsersController.cs

// GET: ApplicationUsers
        public ActionResult Index(string sortOrder, string searchString)
        {
            ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
            ViewBag.EmailSortParm = sortOrder == "Email" ? "email_desc" : "Email";
            var users = from c in db.Users
                           select c;
            if (!String.IsNullOrEmpty(searchString))
            {
                users = users.Where(c => c.Name.ToUpper().Contains(searchString.ToUpper())
                                       || c.Email.ToUpper().Contains(searchString.ToUpper()));
            }
            switch (sortOrder)
            {
                case "name_desc":
                    users = users.OrderByDescending(c => c.Name);
                    break;
                case "Email":
                    users = users.OrderBy(c => c.Email);
                    break;
                case "email_desc":
                    users = users.OrderByDescending(c => c.Email);
                    break;
                default:
                    users = users.OrderBy(c => c.Name);
                    break;
            }




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

Index.cshtml

@using (Html.BeginForm())
{
    <p>
        Find by name: @Html.TextBox("SearchString")
        <input type="submit" value="Search" />
    </p>
}



<table class="table">
    <tr>
        <th>
            @Html.ActionLink("Email", "Index", new { sortOrder = ViewBag.EmailSortParm })
        </th>
        <th>
            @Html.ActionLink("Name", "Index", new { sortOrder = ViewBag.NameSortParm })
        </th>

排序或过滤似乎均无效。 排序时，地址栏变为

/ ApplicationUsers？sortOrder = name_desc

但顺序完全不变。 也许有人可以看到问题出在哪里？

编辑：

可以是' var users = from c in db.Users select c; '字母'c'是错的吗？ 我怎么知道呢？

Answer 1

更改：

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

至：

return View(users);

:-)

Answer 2

您需要将两个参数传递给操作Index ：

@Html.ActionLink("Email", "Index", new { sortOrder = ViewBag.EmailSortParm, searchString = null })