CODEWITHSUNDEEP
asp.netasp.net-mvcentity-framework
tonyedwardspz
tonyedwardspz

Reputation: 1875

Adding SelectListItem to SelectList

I have a MVC app using the Entity framework. I have two entities, user and faculty.

I'm trying to add the faculties to a select list for a dropdown box used during the editing of a user. I'm getting the error:

"Cannot implicitly convert type 'System.Collections.Generic.List' to 'System.Web.Mvc.SelectList'"

I googled around and been through a few solutions to similar questions on here but had no luck.

EditUserModel

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace Purely_Servers.Models
{
    public class EditUserModel
    {
        public user User { get; set; }
        public SelectList FacultyList { get; set; }
    }
}

usersController

    public ActionResult Edit(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }


        var model = new EditUserModel
        {
            User = db.Users.Find(id),
            FacultyList = (
                from f in db.Faculties
                select new SelectListItem
                {
                    Value = f.id.ToString(),
                    Text = f.name
                }).ToList() /////////////////////ERROR HERE
        };


        if (model == null)
        {
            return HttpNotFound();
        }
        return View(model);
    }

Any help would be much appreciated.

Upvotes: 0

Views: 2557

Answers (3)

Deathstalker
Deathstalker

Reputation: 844

This may be of some help to someone.

        CostCenterHeaders CostHeaders = CostCenterHeaders.GetCostCenterHeaders(ClientNumber);
        List<SelectListItem> Level1Header = new List<SelectListItem>();
        if (CostHeaders.Level1Heading !=null)
        {
            Level1Header.Add(new SelectListItem { Text = "All " + CostHeaders.Level1Heading + " Centers", Value = "" });
            List<HierarchyLevel> HierarchyLevels = HierarchyLevel.GetHierarchyByLevel(ClientNumber);
            Level1Header.AddRange(HierarchyLevels.Select(x => new SelectListItem() { Value = x.LevelID, Text = x.LevelDescr }).ToList());
        }

Upvotes: 0

AJ Richardson
AJ Richardson

Reputation: 6820

When you use ToList(), the enumerable is converted to a List<SelectListItem>, which cannot be cast to a SelectList.

You have 2 options:

  1. Change the FacultyList property to be of type List<SelectListItem>.
  2. Convert the query to a SelectList (see code below).

Code for option 2:

FacultyList = new SelectList(
    from f in db.Faculties
    select new SelectListItem
    {
        Value = f.id.ToString(),
        Text = f.name
    });

Upvotes: 1

David Abaev
David Abaev

Reputation: 696

try this:

IEnumerable<SelectListItem> FacultyList { get; set; }

and:

 FacultyList = (
                from f in db.Faculties
                select new SelectListItem
                {
                    Value = f.id.ToString(),
                    Text = f.name
                });

Upvotes: 1

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