CODEWITHSUNDEEP
c#linqlistasp.net-mvc-4razor
Edward.K
Edward.K

Reputation: 566

Generate a List on viewmodel

i will like to generate list and bind into viewmodel but i was get error below, did i define wrong attribute?

The model item passed into the dictionary is of type 'SurveyTool.Models.AnswerQuestionViewModel', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable`1[SurveyTool.Models.AnswerQuestionViewModel]'.

Edit.cshtml:

@model IEnumerable<SurveyTool.Models.AnswerQuestionViewModel>

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>

<table>


@foreach (var item in Model) {
    <tr>

        <td>
            @Html.DisplayFor(modelItem => item.Question)
        </td>
        <td>
            @Html.EditorFor(modelItem => item.Answer)
        </td>
    </tr>
}

</table>

SURV_AnswerController:

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using SurveyTool.Models;

namespace SurveyTool.Controllers
{
    public class SURV_AnswerController : Controller
    {
        private SurveyToolDB db = new SurveyToolDB();
        //
        // GET: /SURV_Answer/

        public ActionResult Edit(int Survey_ID)
        {
            AnswerQuestionViewModel viewmodel = new AnswerQuestionViewModel();

            var query = from r in db.SURV_Question_Ext_Model
                        join s in db.SURV_Question_Model
                        on r.Qext_Question_ID equals
                        s.Question_ID
                        where s.Question_Survey_ID == Survey_ID
                        orderby s.Question_Position ascending
                        select r;

            foreach(var item in query)
            {

                viewmodel.Question = item.Qext_Text;
            }

            return View(viewmodel);
        }

    }
}

AnswerQuestionViewModel:

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


namespace SurveyTool.Models
{
    public class AnswerQuestionViewModel
    {
        public string Answer { get; set; }
        public string Question { get; set; }
    }
}

Upvotes: 0

Views: 385

Answers (1)

user3559349
user3559349

Reputation:

Your returning only a single AnswerQuestionViewModel item, not a collection. In your public ActionResult Edit(int Survey_ID) method, change

AnswerQuestionViewModel viewmodel = new AnswerQuestionViewModel();

to 

List<AnswerQuestionViewModel> viewmodel = new List<AnswerQuestionViewModel>();

and then in the foreach loop

foreach(var item in query)
{
    viewmodel.Add(new AnswerQuestionViewModel() { Question = item.Qext_Text });
}
return View(viewmodel);

Edit

Note there are also problems with your view. You use of a foreach loop generates duplicate name attributes so the collection will not be bound on post back. It also generates invalid html because of the duplicate id attributes. You need to use a for loop of a custom EditorTemplate for typeof AnswerQuestionViewModel. Using a for loop, it needs to be

@model List<SurveyTool.Models.AnswerQuestionViewModel>
@using (Html.BeginForm())
{
    for(int i = 0; i < Model.Count; i++)
    {
        @Html.DisplayFor(m => m[i].Question)
        @Html.EditorFor(m => m[i].Answer)
    }
    <input type="submit" />
}

However this will only post back the Answer property of your model. You do not have any property identifying the ID of the question so you probably need an additional property for the ID, and include a hidden input for it in the view

Upvotes: 1

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