在數據庫中插入DropDownList值

Question

我在db中插入dropdownlist的選定值，但在dropdownlist助手所在的視圖中卻給了我錯誤。 沒有類型為“ IEnumerable”的ViewData項目具有鍵“ SpaceType”。 模型：

        public class AddSpace
        {
             public string SpaceType { get; set; }
        }

視圖：

        @Html.DropDownListFor(m => m.SpaceType,  (IEnumerable<SelectListItem>)ViewData["property"])

控制者

    [HttpGet]
    public ActionResult AddSpace()
    {
        List<SelectListItem> items = new List<SelectListItem>();
        items.Add(new SelectListItem { Text = "Private Residence", Value = "Private Residence" });
        items.Add(new SelectListItem { Text = "Office", Value = "Office" });
        items.Add(new SelectListItem { Text = "Place of worship", Value = "Place of worship" });
        items.Add(new SelectListItem { Text = "Commercial Parking lot", Value = "Commercial Parking lot" });
        items.Add(new SelectListItem { Text = "Retail", Value = "Retail" });
        items.Add(new SelectListItem { Text = "Academic Institution", Value = "Academic Institution" });
        items.Add(new SelectListItem { Text = "Other", Value = "Other" });
        ViewData["property"] = items;

}

     [HttpPost]
     public ActionResult AddSpace(AddSpace adspace)
    {
        if (ModelState.IsValid)
        {
            string userName = "wasfa_anjum@yahoo.com";
            var query = from q in Session.Query<Registration>()
                        where q.Email == userName
                        select q;
            Session.Store(adspace);
                Session.SaveChanges();


        }

        else ModelState.AddModelError("","Please Correct the errors to continue");
        return View();
    }

Answer 1

您是否嘗試過[更新]：

@Html.DropDownList("SpaceTypes", ViewData["property"] as SelectList)

此外，之后：

items.Add(new SelectListItem { Text = "Other", Value = "Other" });

您可能需要添加：

items.Add(new SelectListItem { Text = "Other", Value = "Other" }, "Text", "Value", 1);

[添加]（可選），您應該也可以像這樣編寫它：

var items = new SelectList(new[]
    new { Text = "Private Residence", Value = "Private Residence" },
    new { Text = "Office", Value = "Office" },
    new { Text = "Place of worship", Value = "Place of worship" },
    new { Text = "Commercial Parking lot", Value = "Commercial Parking lot" },
    new { Text = "Retail", Value = "Retail" },
    new { Text = "Academic Institution", Value = "Academic Institution" },
    new { Text = "Other", Value = "Other" },
"Text", "Value", 1);

ViewData["property"] = items;

Answer 2

投射到列表：

  @Html.DropDownListFor(m => m.SpaceType, (List<SelectListItem>)ViewData["property"])