View-bag to fill checkbox-list using asp.net mvc

Question

Below is my model class

   public class InformationMissing : AbstractDBObject
  {
     public int Id { get; set; }
     public string PatientDemographics { get; set; }
     public string InsuranceDetails { get; set; }
     public string PhysicianDetails { get; set; }
     public string Note { get; set; }
     public int personId {get;set;}
     public string status { get; set; }
     public List<CheckboxList_model> RetrievalItem { get; set; }
     }
    public class CheckboxList_model
    {
      public string Text { get; set; }
       public int Value { get; set; }
      public Boolean Selected { get; set; }
     }

below is my controller method

     public ActionResult Process()
    {
   List<CheckboxList_model> chkRetrieval = new List<CheckboxList_model>(){
      new CheckboxList_model{ Text="One", Value = 1 ,Selected=false},
      new CheckboxList_model{ Text="Two", Value = 2 ,Selected=false},
      new CheckboxList_model{ Text="Three", Value = 3 ,Selected=false }
      };

      ViewBag.Retrieval = chkRetrieval;
     return View();
    }

Below code i have tried but checkboxlist is not filling

   @foreach (var Retrieval in ViewBag.Retrieval)
       {

@Html.CheckBoxFor(Retrieval.Selected, new { @class = "flat" })

@Html.DisplayFor(Retrieval.Text)

@Html.HiddenFor(Retrieval.Value)

       }

From below foraech able to see text value but above checkboxlist is not filling

@foreach (var Retrieval in ViewBag.Retrieval)
        {
             <p>
@Retrieval.Text </p>

                }

Answer 1

Hi @coder rock ,
I think you could use CheckBoxList.Just like this:

@Html.CheckBoxList("chkModels", (ViewBag.Retrieval as List<SelectListItem>))  

Best regards,
Yijing Sun

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Answer 2

The html helpers use reflection to find the property to display. (The for helpers convert the lambda expression to a text string). While reflection can find ViewBag.Retrieval, it’s an list and does not have the properties.

You really should not be binding to the viewbag, but if you use array syntax it should work.

    @{ 
     var Retrieval = (List<CheckboxList_model) ViewBag.Retrieval; 
     for (var I =0; I< Retrieval.Count; ++i ) 
     { 
            @Html.CheckBoxFor(Retrieval[i]Selected, new { @class = "flat" }) 
            @Html.DisplayFor(Retrieval[i].Text) 
            @Html.HiddenFor(Retrieval[i].Value) 
     } 
}