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Hi Team

I am using DropDownlistFor in order to get all the list of available countries in the world. Now i am getting this exception saying there is no ViewData item of IEnumerable. This type is only created on my controller, do i need to create it on my Model class.

What I have tried:

private IEnumerable<SelectListItem> GetCountryList()
      SelectList listcn = null;
          var list = this.LoadData().Select(p => new SelectListItem
              Value = p.Country_Id.ToString(),
              Text = p.Country_Name
          listcn = new SelectList(list, "Value", "Text");

      }catch(Exception ex)
         // throw ex;
      return listcn;

   private List<EditTrainingRegFormViewModel> LoadData()
    List<EditTrainingRegFormViewModel> lst = new List<EditTrainingRegFormViewModel>();

        string line = string.Empty;
        string srcFilePath = "Content/files/country_list.txt";
        var rootPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
        var fullPath = Path.Combine(rootPath, srcFilePath);
        string filePath =  new Uri(fullPath).LocalPath;
        StreamReader src = new StreamReader(new FileStream(filePath, FileMode.Open, FileAccess.Read));

        // while to read the file
        while((line = src.ReadLine()) !=null) {
          EditTrainingRegFormViewModel infoLst = new EditTrainingRegFormViewModel();
            string[] info = line.Split(',');

            infoLst.Country_Id = Convert.ToInt32(info[0].ToString());
            infoLst.Country_Name = info[1].ToString();

    }catch(Exception ex)
    return lst;

// Selection for countries in the world.

      public ActionResult DropDownSelect()
          EditTrainingRegFormViewModel model = new EditTrainingRegFormViewModel();

          model.SelectedCountryId = 0;

          this.ViewBag.CountryList = this.GetCountryList();
          return this. View(model);

@Html.DropDownListFor(m=>m.SelectedCountryId, this.ViewBag.CountryList as SelectList, new {@class = "form-control"})
Updated 17-Mar-20 4:23am

1 solution

Look at the types involved:

ViewBag.CountryList is assigned to the value returned by GetCountryList().

GetCountryList returns a IEnumerable<SelectListItem>.

Your view attempts to cast ViewBag.CountryList to a SelectList using the as operator. This will return null, because the value isn't a SelectList. There is no conversion between IEnumerable<SelectListItem> and SelectList.

Change your view to specify the correct type, and use a cast instead of as so you'll get a better error message if the cast fails:
@Html.DropDownListFor(m => m.SelectedCountryId, (IEnumerable<SelectListItem>)ViewBag.CountryList, new { @class = "form-control" })
Type-testing and cast operators - C# reference | Microsoft Docs[^]
SelectList Class (System.Web.Mvc) | Microsoft Docs[^]
SelectExtensions.DropDownListFor Method (System.Web.Mvc.Html) | Microsoft Docs[^]
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