c# - ASP.NET EnumDropDownListFor 生成 DropDown 但不选择模型的值

Question

我的项目有一个大问题。我有一个具有枚举类型属性的 ViewModel:Constants.Days Day(星期一 = 1 到星期日 = 7)，我已经在编辑 View 中使用它来生成下拉列表。在其中正确选择了模型的值。我使用 EnumDropDownListFor Helper。

在另一个 View (这次是使用 RenderAction 助手生成的部分 View )中，我尝试做同样的事情，但 DropDown 不选择模型的日期。选择第一个选项。我尝试使用 TextBoxFor 并将正确的 Day 放入其中。这很奇怪......我尝试做一个经典的 DropDownListFor 但结果是一样的。该值可用，下拉列表已正确生成，但未在下拉列表中选择模型的 Day 值。更新也有效。

有人可以帮我吗？非常感谢:)

在这里您可以看到 View 的屏幕截图，其中日期已正确放入文本框但未在下拉列表中选中。

局部 View :

@model p3t.Models.ScheduledLessonViewModel

<div class="modal" id="@("updateLessonModal" + Model.ScheduledLessonId)" tabindex="-1" role="dialog" aria-labelledby="updateLessonModalLabel">
    <div class="modal-dialog modal-lg">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
                <h4 class="modal-title" id="myModalLabel">Planifier un cours</h4>
        </div>
        @using (Html.BeginForm("UpdateSchedule", "Home"))
        {
            @Html.AntiForgeryToken()

            <div class="form-horizontal ">
                <div class="modal-body">
                    @Html.ValidationSummary(true, "", new { @class = "text-danger" })

                    @Html.HiddenFor(model => model.ScheduledLessonId)

                    <div class="form-group">
                        @Html.LabelFor(model => model.Day, htmlAttributes: new { @class = "control-label col-md-2" })
                        <div class="col-md-10">
                            @Html.TextBoxFor(model => model.Day, htmlAttributes: new { @class = "form-control btn btn-default col-md-10", disabled = "disabled" })
                        </div>
                    </div>
                </div>
            </div>

            <div class="modal-footer">
                <button type="submit" class="btn btn-primary">Mettre à jour</button>
                <button type="button" class="btn btn-default" data-dismiss="modal">Annuler</button>
            </div>
        }
    </div>
</div>

View

@model p3t.Models.ScheduleViewModel
@using p3t.Models.Dal.Dto


@foreach (var lesson in Model.ScheduledLessons)
{
   if (lesson.Section.SectionId == Model.Section.SectionId)
   {
       if (day.Equals(lesson.Day.ToString()) && lesson.BeginHour.Hours == h)
       {
           Html.RenderAction("UpdateSchedule", lesson);

          <div class="lesson">

          @if (User.IsInRole("Administrateur") || User.IsInRole("Secrétaire"))
          {
             <button id="@lesson.ScheduledLessonId" class="pull-left glyphicon glyphicon-cog" data-toggle="modal" data-target="#@("updateLessonModal" + lesson.ScheduledLessonId)"></button>
             <button id="" class="pull-left glyphicon glyphicon-trash"</button>
          }
       }
    }
}

Controller 对 View 的操作:

public ActionResult UpdateSchedule(ScheduledLessonModel model)
        {
            ScheduledLessonViewModel slvm = new ScheduledLessonViewModel();
            slvm.LessonList = new List<SelectListItem>();
            slvm.SectionList = new List<SelectListItem>();
            slvm.ClassroomList = new List<SelectListItem>();

            var lessonList = lessonRepository.GetAll();
            var sectionList = sectionRepository.GetAll();
            var classroomList = classroomRepository.GetAll();

            foreach (var item in lessonList)
            { slvm.LessonList.Add(new SelectListItem { Value = item.LessonId.ToString(), Text = item.Name }); }
            foreach (var item in sectionList)
            { slvm.SectionList.Add(new SelectListItem { Value = item.SectionId.ToString(), Text = item.Tag }); }
            foreach (var item in classroomList)
            { slvm.ClassroomList.Add(new SelectListItem { Value = item.ClassroomId.ToString(), Text = item.Name }); }

            slvm.ScheduledLessonId = model.ScheduledLessonId;
            slvm.Day = model.Day;
            slvm.BeginHour = model.BeginHour;
            slvm.EndHour = model.EndHour;
            slvm.Quadrimester = model.Quadrimester;
            slvm.LessonId = model.Lesson.LessonId;
            slvm.SectionId = model.Section.SectionId;
            slvm.ClassroomId = model.Classroom.ClassroomId;

            return PartialView("ScheduleModal", slvm);
        }

        [HttpPost]
        public ActionResult UpdateSchedule(ScheduledLessonViewModel slvm)
        {
            try
            {
                ScheduledLessonModel slmodel = new ScheduledLessonModel();
                slmodel.Lesson = new LessonModel();
                slmodel.Section = new SectionModel();
                slmodel.Classroom = new ClassroomModel();

                slmodel.ScheduledLessonId = slvm.ScheduledLessonId;
                slmodel.Day = slvm.Day;
                slmodel.BeginHour = slvm.BeginHour;
                slmodel.EndHour = slvm.EndHour;
                slmodel.Quadrimester = slvm.Quadrimester;
                slmodel.Lesson.LessonId = slvm.LessonId;
                slmodel.Section.SectionId = slvm.SectionId;
                slmodel.Classroom.ClassroomId = slvm.ClassroomId;

                scheduledLessonRepository.Update(slmodel);

                return RedirectToAction("Schedule", new { sectionId = slvm.SectionId });
            }
            catch (Exception)
            {

                throw;
            }
        }

Answer 1

在您的 Schedule GET 操作中，尝试将 vm.Day 设置为您希望下拉列表选择的任何值。