mvc-MVC dropdown list的問題

MVC dropdown list的問題

error: There is no ViewData item of type 'IEnumerable' that has the key 'AppCurrentLanguage'.

Model:
public class HomeIndexView
{
public IList TileList { get; set; }
public string InfoMessage { get; set; }
public HomeIndexView()
{
TileList = new List();
}
public List LanguageList { get; set; }
public string AppCurrentLanguage { get; set; }

}


    view:
     @Html.DropDownListFor(model => model.AppCurrentLanguage, Model.LanguageList, new { id="appLanguage", name="appLanguage", tabindex = "0" })

    controller:
    public ActionResult GetLanguage()
    {
        HomeIndexView model = new HomeIndexView
        {

            LanguageList = this.RetrieveLanguagesList(),

        };

        //return PartialView("ViewsList", model);
        return View(model);
    }

    public List<SelectListItem> RetrieveLanguagesList()
    {
        var list = new List<SelectListItem>();
        var sourceOfCallList = uow.AppLanguage.GetAll().ToList();
        if (sourceOfCallList != null)
        {
            foreach (var type in sourceOfCallList)
            {
                //list.Add(type.LanguageName+"-"+type.LanguageCode);
                list.Add(new SelectListItem { Text = type.LanguageName, Value = type.LanguageCode });
            }

        }
        return list;
    }

最佳回答：

this.RetrieveLanguagesList()
怎麼寫的
AppCurrentLanguage也沒有帶上值