我被卡住了。我正在尝试执行一个简单的搜索表单，但它不会返回任何结果。
这是我的控制器：

public ActionResult search(FormCollection frmCollection)
    {

        var search = frmCollection["searchString"];
        List<JobViewModel> lst = new List<JobViewModel>();

        var result = from a in db.jobs
                     join b in db.jobcategories on a.category_id equals b.id
                     join c in db.jobstatus on a.status_id equals c.id
                     select new
                     {
                         id = a.id,
                         title = a.title,
                         category_id = a.category_id,
                         category_name = b.name,
                         city = a.city,
                         state = a.state,
                         zip = a.zip,
                         status_id = a.status_id,
                         status_name = c.name,
                         description = a.description,
                         qualifications = a.qualifications,
                         required_education = a.required_education,
                         application_link = a.application_link

                     };
        if (!String.IsNullOrEmpty(search))
        {
            result = result.Where(s => s.title.Contains(search));
        }

        foreach (var item in result)
        {
            var JobModel = new JobViewModel
            {
                id = item.id,
                title = item.title,
                category_id = item.category_id,
                category_name = item.category_name,
                city = item.city,
                state = item.state,
                zip = item.zip,
                status_id = item.status_id,
                status_name = item.status_name,
                description = item.description,
                qualifications = item.qualifications,
                required_education = item.required_education,
                application_link = item.application_link
            };
            lst.Add(JobModel);
        }

        return View("SearchResults", lst.AsQueryable());
    }

这里是我的搜索表单：

@Html.ActionLink("View All Positions", "ListAll")

@using (Html.BeginForm("search", "JobSearchController", "search"))
{
    <p>
        Search: @Html.TextBox("searchString")
        <input class="btn btn-primary btn-sm" type="submit" value="search" />
    </p>
}

这是我的结果页面：

@model IEnumerable<Viaero.Next.Mvc.Models.JobViewModel>

RESULTS: @Model.Count()
POST: @Request["searchString"]

@if (Model.Count() > 0)
{
    <table class="table table-hover">
        <tbody>
            @foreach (var o in Model)
            {
                <tr>
                    <td>
                        <span style="font-weight: bold"><a href="/about-viaero-wireless/careers/details/@o.id">@o.title</a></span><br /><br />
                        @(o.city + ", " + o.state)
                    </td>
                    <td><a class="btn btn-success btn-sm" target="_blank" href="@o.application_link">APPLY</a></td>
                </tr>
            }
        </tbody>
    </table>
}
else
{
    <p>Sorry, there are no results.  Please try again.</p>
}

问题是，无论我在搜索框中输入什么，我得到的结果都是零。然而，如果我将“where a.title.Contains（search）”替换为“where a.title.Contains（“某个字符串”）”它每次都能工作。
我已经验证了文本框的值被传递到视图，并且控制器可以看到它，但是它仍然不工作。有什么建议吗？