在 PagedList 上丢失当前过滤器

Question

有人可以帮助我并告诉我哪里出错了。我有一个显示错误列表的仪表板。顶部有一个带有type="date" 的文本框，允许用户选择日期。然后该列表会自行更新以显示在所选日期发生的错误。我想在此实现 PagedList，但是当我单击第二页时，它不会显示任何结果

控制器

public ActionResult Index(string sortOrder, int? page)
    {
        ViewBag.CurrentSort = sortOrder;
        ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";

        var applications = from s in db.ElmahErrors
                           where s.TimeUtc == DateTime.Today
                           select s;

        switch (sortOrder)
        {
            default:
                applications = applications.OrderByDescending(x => x.TimeUtc);
                break;
        }

        int pageSize = Int32.Parse(System.Configuration.ConfigurationManager.AppSettings["DefaultPageSize"]);
        int pageNumber = (page ?? 1);
        return View(applications.ToPagedList(pageNumber, pageSize));
    }

    [HttpPost]
    public ActionResult Index(string sortOrder, string currentFilter, int? page)
    {
        ViewBag.CurrentSort = sortOrder;
        ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";


        DateTime userSelectedDate = DateTime.Parse(Request["datePicker"]).Date;

        string dateString = userSelectedDate.ToString("yyyy-MM-dd");

        if (dateString != null)
        {
            page = 1;
        }
        else
        {
           dateString = currentFilter;
        }

        ViewBag.CurrentFilter = dateString;

        var startDate = userSelectedDate.Date;
        var endDate = startDate.AddDays(1);

        var applications = from s in db.ElmahErrors
                           //where s.TimeUtc >= startDate && s.TimeUtc < endDate
                           select s;

        if (!String.IsNullOrEmpty(dateString))
        {
            applications = applications.Where(s => s.TimeUtc >= startDate && s.TimeUtc < endDate);
        }

        switch (sortOrder)
        {
            default:
                applications = applications.OrderByDescending(x => x.TimeUtc);
                break;
        }

        int pageSize = Int32.Parse(System.Configuration.ConfigurationManager.AppSettings["DefaultPageSize"]);
        int pageNumber = (page ?? 1);
        return View(applications.ToPagedList(pageNumber, pageSize));
    }

查看

@model PagedList.IPagedList<DataIntelligence.Models.ElmahError>
@using PagedList.Mvc;
<link href="Content/PagedList.css" rel="stylesheet" type="text/css" />

@{
    ViewBag.Title = "Errors By Day";
}

<div class="jumbotron">
    <h2>Errors By Day</h2>
</div>

@using (Html.BeginForm("Index", "Day", FormMethod.Post, new { id = "frmSearch" }))
{
    <label for="datePicker">Find By Date:</label>
    @Html.TextBox("datePicker", ViewBag.CurrentFilter as string, new { @type = "date"})

}

<script>
    $("#datePicker").change(function () {
        $("#frmSearch").submit();
    });
</script>
<table>
    <tr>
        <th>
            Application
        </th>
        <th>
            Host
        </th>
        <th>
            Type
        </th>
        <th>
            Date
        </th>
        <th>
            Message
        </th>
    </tr>

    @foreach (var item in Model)
    {
        <tr>

            <td style="width:400px;">
                <a href="@Url.Action("Details", new { id=item.ErrorId})"> @Html.DisplayFor(modelItem => item.Application) </a>
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Host)
            </td>
            <td style="width:550px;">
                @Html.DisplayFor(modelItem => item.Type)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.TimeUtc)
            </td>
            <td>
                @{
                    string parameterValue = item.Message.Substring(0, 8);
                }

                @Html.DisplayFor(modelItem => parameterValue)
            </td>
        </tr>
    }
</table>
<br />
Page @(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) of @Model.PageCount

@Html.PagedListPager(Model, page => Url.Action("Index",
new { page, sortOrder = ViewBag.CurrentSort, currentFilter = ViewBag.CurrentFilter }))

我尝试从 POST 更改为 GET，但我似乎无法弄清楚如何让它工作。

有人可以建议我改变什么以使我的 PagedList 正常工作吗？

提前致谢。

Answer 1

PagedList，正如您可能发现的most of paging modules，在您单击下一页时使用 GET，而不是 POST。所以请求到达的不是标有HttpPost 的操作，而是默认的操作。因此不应用日期过滤器，您会收到包含今天错误的第二页。我猜今天没有足够的错误（很好，嗯？）来填充第二页的数据。

我建议您切换到仅处理 GET 请求的单个操作。毕竟，这是数据查看等幂等操作的推荐方式。理想情况下，应仅在服务器上更改数据时使用 POST。