Question

I having below code for different artifacts,

Entity

public class ChooseFirst
{
    public int ChooseFirstId { get; set; }
    public string ChooseFirstName { get; set; }
}

View Model

public class SelectViewModel
{
    public IEnumerable<SelectListItem> ListChooseFirst { get; set; }
}

Controller/Get Action

//
    // GET: /MenuOne/

    public ActionResult MenuOne()
    {
        var selectViewModel = new SelectViewModel
                                  {
                                      ListChooseFirst = ChooseFirstList()
                                  };

        return View(selectViewModel);
    }
 private IEnumerable<SelectListItem> ChooseFirstList()
    {
        //here data comes from database
        List<ChooseFirst> list = _getFComboService.GetFComboList();

        List<SelectListItem> items = new List<SelectListItem>();
        foreach (ChooseFirst chooseFirst in list)
        {
            SelectListItem item = new SelectListItem();
            item.Text = chooseFirst.ChooseFirstName;
            item.Value = chooseFirst.ChooseFirstId.ToString();
            items.Add(item);
        }
        return items;
    }

HTML View

@Html.DropDownList("FCombo", Model.ListChooseFirst, "--Select One--")

Now Problem when I post my form the value for “selectViewModel” is NULL, Is there a need to model binder, please suggest and help me how to create Model Binder for this?

//
    // POST: /MenuOne/
    [HttpPost]
    public ActionResult MenuOne(SelectViewModel selectViewModel)
    {
        return View();
    }

Answer 1

that is correct. all that is posted to the server is ‘FCombo’ with a value of the selected option. there is no enumeration of select list items. instead what you need is a view model for the posted data.

class SelectedOptionViewModel
{
    public int FCombo {get;set;}
}

or you can simply pass the parameter directly as an argument

public ActionResult MenuOne(int fcombo)
{
}