Question

我有两个表连接在一起并返回搜索结果视图。查询中的记录格式如下：

degreeid schoolid  seqno  coursename
1        1         1           A
1        1         1           B
1        1         2           C
1        1         3           D

我需要用相同的seqno计算课程。如何在剃刀视图foreach循环或控制器中实现它？我可以创建一个函数来返回控制器中的计数，但是如何从剃刀视图中调用此计数函数？

 public class HomeController : Controller
{
    private CourseDataModel db = new CourseDataModel();

    ActionResult Index()
    {
     using (CourseDataModel db = new CourseDataModel())
        {

      var searchResults = (from a in TableA
                           join b in TableB on
                                        new { subject=a.subject, catalog=a.catalog } equals
                                         new { subject=b.Subject, catalog=b.Catalogno } into ab


                                         orderby a.seqno
                                         from b in ab.DefaultIfEmpty()

                                         select new JoinModel
                                         {
                                             Courselist = a,
                                             Contentsummary = b
                                         }
                                       ).ToList();




                    if (searchResults == null) { return Content("No record found"); }


                            return View(searchResults);

                }
            }

我的index.cshtml代码如下：

   @model IEnumerable<course.Models.JoinModel>
             @if (Model != null)
        {

            if (Model.Count() != 0)
            {


                    <table >
                    <tbody>

                        <tr>
                            <th class="column1" scope="col">Degree ID</th>
                            <th class="column2" scope="col">Course</th>
                            <th class="column3" scope="col">Count</th>


                        </tr>


                        @foreach (var item in Model)
                        {
                            <!-- display class="new-sequence" when degree_seqno changes-->
                            <tr >
                                <td class="column1">

                                            @Html.DisplayFor(modelItem => item.Courselist.degreeno)

                                </td>
                                <td class="column2">
                                              @Html.DisplayFor(modelItem => item.Courselist.coursename)
                                </td>
                                <td> @* here I want to display a count of the same seqno *@
                                </td>
                                </tr>
                         } 
    </tbody>
    </table>

Answer 1

如何按IGrouping分组，那么您可以计算每个group ab by ab.seqno into seqNoGrps

中的结果

@foreach(var grp in Model) { <tr><td>@grp.Key</td></tr> @foreach(var joinModel in grp) { <tr> <td class="column1"> @Html.DisplayFor(modelItem => item.Courselist.degreeno) </td> <td class="column2"> @Html.DisplayFor(modelItem => item.Courselist.coursename) </td> <td> @* here I want to display a count of the same seqno *@ @grp.Count() </td> </tr> } }

然后在您的视图中迭代每个组

SELECT main.NBHD, main.PARID, main.PRICE, main.SALEDT, main.SALEVAL 
FROM 
   (SELECT t.NBHD, t.PARID, t.PRICE, t.SALEDT, t.SALEVAL, 
          (SELECT COUNT(*) FROM mytable sub
           WHERE sub.NBHD = t.NBHD
           AND sub.SALEDT >= t.SALEDT) AS rank
    FROM mytable t) AS main
WHERE main.rank <= 40
ORDER NBHD, PARID, SALEDT DESC

Answer 2

试试这个

foreach (var group in Model.GroupBy(item => item.seqno)) { foreach (var item in group) { <tr> <td class="column1"> @Html.DisplayFor(modelItem => item.degreeno) </td> <td class="column2"> @Html.DisplayFor(modelItem => item.coursename) </td> <td> @group.Count() </td> </tr> } }

如何在Razor View中获取行数

2 个答案: