ASP MVC 2: Error with dropdownlist on POST
- by wh0emPah
Okay i'm new to asp mvc2 and i'm experiencing some problems with the
htmlhelper called Html.dropdownlistfor();
I want to present the user a list of days in the week. And i want the selected item to be bound to my model.
I have created this little class to generate a list of days + a short notation which i will use to store it in the database.
public static class days
{
public static List<Day> getDayList()
{
List<Day> daylist = new List<Day>();
daylist.Add(new Day("Monday", "MO"));
daylist.Add(new Day("Tuesday", "TU"));
// I left the other days out
return daylist;
}
public class Dag{
public string DayName{ get; set; }
public string DayShortName { get; set; }
public Dag(string name, string shortname)
{
this.DayName= name;
this.DayShortName = shortname;
}
}
}
I really have now idea if this is the correct way to do it
Then i putted this in my controller:
SelectList _list = new SelectList(Days.getDayList(), "DayShortName", "DayName");
ViewData["days"] = _list;
return View("");
I have this line in my model
public string ChosenDay { get; set; }
And this in my view to display the list:
<div class="editor-field">
<%: Html.DropDownListFor(model => model.ChosenDay, ViewData["days"] as SelectList, "--choose Day--")%>
</div>
Now this all works perfect. On the first visit, But then when i'm doing a [HttpPost]
Which looks like the following:
[HttpPost]
public ActionResult Registreer(EventRegistreerViewModel model)
{
// I removed some unrelated code here
// The code below executes when modelstate.isvalid == false
SelectList _list = new SelectList(Days.getDayList(), "DayShortName", "DayName");
ViewData["days"] = _list;
return View(model);
}
Then i will have the following exception thrown:
The ViewData item that has the key 'ChosenDay' is of type 'System.String' but must be of type 'IEnumerable<SelectListItem>'.
This errors gets thrown at the line in my view where i display the dropdown list.
I really have no idea how to solve this and tried several solutions i found online. but none of them really worked.
Ty in advance!
