为什么所选值没有出现在下拉列表中？

Question

我正在加载项目，它在下拉列表中，但是我要选择的是从该数据库中选择的项目，即在编辑模式下，从该数据库中选择的项目，即ID和名称在下拉菜单中预先选择，但不是。为什么？

   public ActionResult Edit(int id)
    {
        User user = (User)Session["User"];


        if (user == null)
        {
            return RedirectToAction("Login", "Home");

        }

        UnitOfWork uwork = new UnitOfWork();
        InspectionReport InspectionReportUow = uwork.InspectionReportRepository.GetByID(id);

        InitialsDAL InitialsDAL = new DAL.InitialsDAL();
        ViewBag.ListInitials = InitialsDAL.GetInitialsListFiltered("");

        ProjectsDAL ProjectsDAL = new DAL.ProjectsDAL();
        TempData["Projects"] = ViewBag.ListProjects = ProjectsDAL.GetProjectsListFiltered("", (user.UserRoleName == "admin" || user.UserRoleName == "Admin" || user.UserRoleName == "Preparator" || user.UserRoleName == "preparator") ? user.Emp_ID : 0);

        RemarksHistoryDAL RemarksHistoryDAL= new DAL.RemarksHistoryDAL();

        InspectionReportUow.ListRemarksHistory = RemarksHistoryDAL.GetRemarksHistoryByInpecID(id); //id= InspectionReportID

        return View(InspectionReportUow);
    }

查看：

@model VAILCertificates.DAL.Entities.InspectionReport

@{
    ViewBag.Title = "";
    Layout = "~/Views/Shared/_Layout.cshtml";
}



@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>Inspection Report Details</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.InspectionReportID)

        <div class="form-group">
            @Html.Label("Project", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-3">
                @Html.DropDownListFor(model => model.ProjectID, new SelectList(ViewBag.ListProjects, "ID", "ProjectNo"),
                   "-Select-",
                 new { @class = "form-control" })
                @Html.ValidationMessageFor(model => model.ProjectID, "", new { @class = "text-danger" })
            </div>
        </div>
}