Dropdownlist

Question

Hi everybody,

 

I have this:

 

[code]

 

using Multitask.Regenboog.Medicijnverstrekking.Domain;

using Multitask.Regenboog.Medicijnverstrekking.WebApplication.Validation;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

namespace Multitask.Regenboog.Medicijnverstrekking.WebApplication.ViewModels.FAQ

{

public class FaqOverviewModel

{

public int Id { get; set; }

public string EmailBericht { get; set; }

public string Naam { get; set; }

public FaqOverviewModel(List<FaqCategorie>Categorie)

{

this.Categorie = Categorie;

}

public FaqOverviewModel()

{

// TODO: Complete member initialization

}

#region FAQCategorie

private readonly List<FaqCategorie> Categorie;

public int? SelectedCategoriedFaqId { get; set; }

public IEnumerable<SelectListItem> FAQCategorieItems

{

get

{

return new SelectList(Categorie, "Id", "Name");

}

}

#endregion

#region subcategorie

#endregion

}

}

[/code] 

 

 

[code]

 

public class FAQController : Controller

{

//FaqService faqService;

FaqCategorieService faqCategorieService;

public FAQController(FaqCategorieService faqCategorieService)

{

this.faqCategorieService = faqCategorieService;

}

// GET: FAQ

[HttpGet]

public ActionResult Index()

{

//var cats = faqCategorieService.GetAll().ToList();

var categories = faqCategorieService.GetAll().OrderBy(x => x.Naam)

.Select(a => new FaqOverviewModel()

{

Id = a.Id,

Naam = a.Naam

}).ToList();

foreach (var categorie in categories)

{

categorie.Naam = categorie.Naam + " (" + categorie.Id.ToString() + ")";

}

categories.Insert(0, new FaqOverviewModel() { Id = -1, Naam = "Maak een keuze..." });

return View(new FaqOverviewModel());

}

[/code] 

 

[code]

 

@using Multitask.Regenboog.Medicijnverstrekking.Domain

@model Multitask.Regenboog.Medicijnverstrekking.WebApplication.ViewModels.FAQ.FaqOverviewModel

@{

ViewBag.Title = "Index";

}

<h2>Support</h2>

@using (Html.BeginForm())

{

//if (Model.ZorgverzekeraarInvoerEnabled)

//{

<span class="fixedLabelWidth">@Html.LabelFor(model => model.SelectedCategoriedFaqId, "Categorie:")</span>

@Html.DropDownListFor(x => x.SelectedCategoriedFaqId, Model.FAQCategorieItems )

//@Html.HiddenFor(model => model.ZorgverzekeraarInvoerEnabled)

@*<div class="editor-label">

@Html.LabelFor(m => m)

</div>*@

@*<div class="editor-field">

<span class="fixedLabelWidth">@Html.LabelFor(model => model.SelectedSubCategorieFaqId, "Onderwerp:")</span>

@Html.DropDownListFor(m => m.SelectedSubCategorieFaqId, Model.FaqSubCategorieItems, new { style = "width: 150px" })

</div>*@

<span class="fixedLabelWidth">@Html.LabelFor(model => model.EmailBericht, "Bericht:")</span>

@Html.TextAreaFor(x => x.EmailBericht)

@*}*@

}

[/code] 

 

But I get this error:

Value cannot be null.
Parameter name: items

 

By this line:

 

get

{

return new SelectList(Categorie, "Id", "Name");

}

 

 

Thank you