CheckBox implementation

Question

I would like to have a checkbox for my Online_Ballot, where a checkbox contains of candidates where a voter could vote for a specific candidates.

Below is my code.

CandidatesViewModel.cs

public class CandidatesViewModel
{
    public IEnumerable<candidates> AvailableCandidates { get;set; }
    public IEnumerable<Candidates> SelectedCandidates { get; set; }
    public PostedCandidates PostedCandidates { get; set; }
}

public class PostedCandidates
{
    public string[] CandidatesId { get; set; }
}

Candidates.cs

public class Candidates
{
    public int candidates_info_id { get; set; }
    public string candidates_fullname { get; set; }
    public object Tags { get; set; }  
    public bool IsSelected { get; set; }
}

Controller

public ActionResult Votation(PostedCandidates PostedCandidates)
{
    return View();
}

View

@Html.CheckBoxListFor(x => x.PostedCandidates.CandidatesId,  
                  x => x.AvailableCandidates,      
                  x => x.candidates_info_id,                    
                  x => x.candidates_fullname,                
                  x => x.SelectedCandidates)

But when I tried to run this code, an error is displayed:

'System.Collections.Generic.IEnumerable' does not contain a definition for 'PostedCandidates' and no extension method 'PostedCandidates' accepting a first argument of type 'System.Collections.Generic.IEnumerable' could be found (are you missing a using directive or an assembly reference?)

Post the code for whole view. I think the problem is with the code that you did not post here. — Jenish Rabadiya
– Jenish Rabadiya, Commented Mar 23, 2015 at 4:03
@model IEnumerable<Online_Ballot.Models.CandidatesViewModel> — Jen143
– Jen143, Commented Mar 23, 2015 at 4:07
I add this in my view:@model IEnumerable<Online_Ballot.Models.CandidatesViewModel>@using MvcCheckBoxList.Model — Jen143
– Jen143, Commented Mar 23, 2015 at 4:08

Jenish Rabadiya · Accepted Answer · 2015-03-23 05:25:05Z

1

You are declaring model of type IEnumerable<Online_Ballot.Models.CandidatesViewModel> and using it like you are having an instance not a collection.

you either need to change your model declaration to following (assuming you are passing single instance of type CandidatesViewModel to view from controller):

@model Online_Ballot.Models.CandidatesViewModel

or you can change checkbox list generation to something like this (assuming you are passing collection to the view from controller and that collection is having only one element).

@Html.CheckBoxListFor(x => x.FirstOrDefault().PostedCandidates.CandidatesId,  
              x => x.FirstOrDefault().AvailableCandidates,      
              x => x.FirstOrDefault().candidates_info_id,                    
              x => x.FirstOrDefault().candidates_fullname,                
              x => x.FirstOrDefault().SelectedCandidates)

Although I would recommend you to go with change model declaration.

Update

I also noticed you are not passing instance of your view model to view.

public ActionResult Votation(PostedCandidates PostedCandidates)
{
    CandidatesViewModel vm = new CandidatesViewModel();
    //process or fill your viewmodel here.
    return View(vm);
}

edited Mar 23, 2015 at 5:25

answered Mar 23, 2015 at 4:17

Jenish Rabadiya

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3 Comments

Jen143 Over a year ago

When I run the program, it returns a null value.

Jenish Rabadiya Over a year ago

@JenalynParagados as my answer assumes you need to pass instance of your viewmodel to the view. CandidatesViewModel vm = new CandidatesViewModel(); and then pass instance of that viewmodel to view method like return view(vm);.

Jen143 Over a year ago

Is CheckBoxFor should be a boolean type value?

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