submit a list become null in the post + MVC - asp.net-mvc

Question

I have a ViewModel:
public class RegistrationViewModel
{
public string Country { get; set; }
public ConfigurationParamValue CountryParam { get; set; }
public string Civility { get; set; }
public ConfigurationParamValue CivilityParam { get; set; }
[FirstNameValidator(Category = "Registration", IsLocal = false )]
public string FirstName { get; set; }
public ConfigurationParamValue FirstNameParam { get; set; }
[LastNameValidator(Category = "Registration", IsLocal = false)]
public string LastName { get; set; }
public List<int> Days { get; set; }
public int SelectedDay{ get; set; }
public List<Month> Months { get; set; }
public Month SelectedMonth { get; set; }
public List<int> Years { get; set; }
public int SelectedYear { get; set; }
public DateTime BirthDate { get; set; }
}
I create a view with this viewmodel :
#model Registration.Front.Web.Models.RegistrationViewModel
#{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Index</h2>
#using (Html.BeginForm()) {
#Html.AntiForgeryToken()
#Html.ValidationSummary(true)
<fieldset>
<legend>RegistrationViewModel</legend>
<div class="editor-label">
#Html.LabelFor(model => model.Country)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Country)
#Html.ValidationMessageFor(model => model.Country)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Civility)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Civility)
#Html.ValidationMessageFor(model => model.Civility)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.FirstName)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.FirstName)
#Html.ValidationMessageFor(model => model.FirstName)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.LastName)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.LastName)
#Html.ValidationMessageFor(model => model.LastName)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.BirthDate)
</div>
<div class="editor-field">
#Html.DropDownListFor(model => model.SelectedDay, new SelectList(Model.Days))
#Html.ValidationMessageFor(model => model.BirthDate)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Occupation)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Occupation)
#Html.ValidationMessageFor(model => model.Occupation)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.ZipCode)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.ZipCode)
#Html.ValidationMessageFor(model => model.ZipCode)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Email)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Email)
#Html.ValidationMessageFor(model => model.Email)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Password)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Password)
#Html.ValidationMessageFor(model => model.Password)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.CGV)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.CGV)
#Html.ValidationMessageFor(model => model.CGV)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Optin)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Optin)
#Html.ValidationMessageFor(model => model.Optin)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.CNIL)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.CNIL)
#Html.ValidationMessageFor(model => model.CNIL)
</div>
<p>
<input type="submit" value="Create" />
</p>
</fieldset>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
this is My contoller:
public ActionResult Index()
{
List<int> listDays = new List<int>(){1, 2, 3};
return View(new RegistrationViewModel() { Days=listDays });
}
[HttpPost]
public ActionResult Index( RegistrationViewModel rvm)
{
if (ModelState.IsValid)
{ return RedirectToAction("Welcome"); }
return View(rvm);
}
public ActionResult Welcome()
{
return View();
}
My problem is in the post, the property Days of the viewmodel is null!!!!! How can i correct this?

Answer 1

in your View you are not rendering Days inside form
Render hidden fields inside form with name="Days" like
foreach(var day in #Model.Days)
{
<input type="hidden" name="Days" />
}
copy the above code and paste it after
<div class="editor-field">
#Html.EditorFor(model => model.CNIL)
#Html.ValidationMessageFor(model => model.CNIL)
</div>
Now,when you submit, the Days values will also submitted to the Post method and you will get values in Days List.