Additional information: There is no ViewData item of type 'IEnumerable<SelectListItem> Asp.NET MVC

Question

I got a problem, Please help me on this Error : Additional information: There is no ViewData item of type 'IEnumerable' that has the key '

MyAction Code

 [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult GiderEkle(Faturalar fatura, Giderler gideriki)
    {
        List<SelectListItem> item8 = new List<SelectListItem>();
        foreach (var c in db.Caris)
        {
            item8.Add(new SelectListItem
            {
                Text = c.Adi,
                Value = c.CariID.ToString()
            });

        }

        ViewBag.countrydrop = item8;

        return View();
    }

My .cshtml Code

<div class="form-group">
        <p>Müşterı Adı</p>
        <div class="col-md-10">
            @Html.DropDownList("country",(IEnumerable<SelectListItem>)ViewBag.country,"Select country")
            @Html.ValidationMessageFor(model => model.CariID, "", new { @class = "text-danger" })
        </div>
    </div>

My Model Cari,

public class Cari
{
    [Key]
    public int CariID { get; set; }
    public IEnumerable<SelectListItem> DropDownItems { get; set; }
    public bool MusteriTip { get; set; }
    public string Unvan { get; set; }
    public string TC { get; set; }
    public string Adi { get; set; }
    public string Soyadi { get; set; }
    public string Adres { get; set; }
    public string VD { get; set; }
    public string VKN { get; set; }
    public string Telefon { get; set; }
    public string Email { get; set; }
    public string WebSite { get; set; }
}

Faturalar model,

public class Faturalar
{
    [Key]
    public int FaturaID { get; set; }
    public string Tarih { get; set; }
    public int CariID { get; set; }
    [ForeignKey("CariID")]
    public Cari Caris { get; set; }
    public int FaturaNo { get; set; }
    public List<Giderler> Giderlers { get; set; }
}

Giderler model,

 public class Giderler
{
    [Key]
    public int GiderlerID { get; set; }
    public int FaturaID { get; set; }
    [ForeignKey("FaturaID")]
    public Faturalar Faturalar { get; set; }
    public string Aciklama { get; set; }
    public int Miktar { get; set; }
    public string Birim { get; set; }
    public double Fiyat { get; set; }
    public double KDV { get; set; }
    public double Tutar { get; set; }
}

and finally on the up side

@model UmtKontrolMerkezi.Models.Faturalar

Answer 1

The ViewBag property is called countrydrop and you are attempting to cast ViewBag.country to an IEnumerable<SelectListItem> which does not exist.

You could use:

@Html.DropDownList("country",(IEnumerable<SelectListItem>)ViewBag.countrydrop,"Select country")

Which would reference the correct variable you have defined within your GiderEkle Action Method, however I would prefer a strongly typed view model over the ViewBag approach.

I have proved this works by the following Fiddle:

https://dotnetfiddle.net/xXnQwy

Action Method:

    public ActionResult DropDownListTest()
    {
        var myList = new List<SelectListItem>();

        myList.Add(new SelectListItem { Text = "Darren one", Value = "1" });
        myList.Add(new SelectListItem { Text = "Darren two", Value = "2" });
        myList.Add(new SelectListItem { Text = "Darren three", Value = "3" });

        ViewBag.DarrenList = myList;

        return View();
    }

CSHTML file:

@Html.DropDownList("DarrenId",(IEnumerable<SelectListItem>)ViewBag.DarrenList)