Error while trying to pass an ordered collection to a View

Question

I’m trying to get to the View an ordered collection, but I’m always having the same error:

There is no Viewdata item of type 'Ienumerable' that has the key 'Titulodecortesia'

The only way I can successfully run my code is by using the following line:

@Html.DropDownListFor(model => model.TituloDeCortesia, new SelectList(new[] { "Dr.", "Mr.", "Ms.", "Mrs." }), String.Empty)

However, no sorting. In this example I sorted manually, but in the case of larger and dynamic listings, this solution I found would not solve.

Follow my code below:

Controller

public ActionResult Adicionar()
{
    List< string > ListaTitulo = new List< string > { "Ms.", "Dr.", "Mrs.", "Mr." };
    ListaTitulo.Sort();
    ViewBag.TituloDeCortesia = new SelectList(ListaTitulo);
    return View();
}

View

@model MvcModeloEmpresa.Dominio.Empregado
@{
    ViewBag.Title = "Adicionar";
}

<h2>Adicionar</h2>

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>Empregado</legend>
        @Html.HiddenFor(model => model.EmpregadoID)

        <div class="col-md-10">
            @Html.LabelFor(model => model.PrimeiroNome)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.PrimeiroNome)
            @Html.ValidationMessageFor(model => model.PrimeiroNome)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.UltimoNome)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.UltimoNome)
            @Html.ValidationMessageFor(model => model.UltimoNome)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Titulo)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Titulo)
            @Html.ValidationMessageFor(model => model.Titulo)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.TituloDeCortesia)
        </div>
        <div class="editor-field">
            @Html.DropDownList("TituloDeCortesia", String.Empty)
            @Html.ValidationMessageFor(model => model.TituloDeCortesia)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.DataNascimento)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.DataNascimento)
            @Html.ValidationMessageFor(model => model.DataNascimento)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.DataContratacao)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.DataContratacao)
            @Html.ValidationMessageFor(model => model.DataContratacao)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Endereco)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Endereco)
            @Html.ValidationMessageFor(model => model.Endereco)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Cidade)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Cidade)
            @Html.ValidationMessageFor(model => model.Cidade)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Regiao)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Regiao)
            @Html.ValidationMessageFor(model => model.Regiao)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.CodigoPostal)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.CodigoPostal)
            @Html.ValidationMessageFor(model => model.CodigoPostal)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Pais)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Pais)
            @Html.ValidationMessageFor(model => model.Pais)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.TelefoneResidencial)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.TelefoneResidencial)
            @Html.ValidationMessageFor(model => model.TelefoneResidencial)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Extensao)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Extensao)
            @Html.ValidationMessageFor(model => model.Extensao)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Notas)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Notas)
            @Html.ValidationMessageFor(model => model.Notas)
        </div>

        <p>
            <input type="submit" value="Salvar" />
        </p>
    </fieldset>
}

<div>
    @Html.ActionLink("Voltar", "Index")
</div>

Error Presented

Answer 1

These two forms as example below are correct:

@Html.DropDownList("TituloDeCortesia", String.Empty)
@Html.DropDownList("TituloDeCortesia", (SelectList)ViewBag.TituloDeCortesia)

That is, your code is correct by what is in question, what must be happening is another type of error of not passing the information correctly through Viewbag.

Another way

public ActionResult Adicionar()
{

    IList<SelectListItem> Lista = new List<SelectListItem>();

    Lista.Add(new SelectListItem() { Text = "Ms.", Value = "Ms." });
    Lista.Add(new SelectListItem() { Text = "Dr.", Value = "Dr." });
    Lista.Add(new SelectListItem() { Text = "Mrs.", Value = "Mrs." });
    Lista.Add(new SelectListItem() { Text = "Mr.", Value = "Mr." });

    ViewBag.ListaTitulo = Lista;

    return View();
}

View: (Only that stretch)

<div class="editor-label">
    @Html.Label("Titulo de Cortesia")
</div>
<div class="editor-field">
    @Html.DropDownListFor(m => Model.TituloDeCortesia, (IEnumerable<SelectListItem>)ViewBag.ListaTitulo)
    @Html.ValidationMessageFor(model => model.TituloDeCortesia)
</div>

Note that the Label I had to put directly in this case, please test!!!

Answer 2

i discovered the error in my code. I was using hidden field in a Data Insertion View that there is no need. Upon realizing the error and deleting, I was able to pass a collection directly through my controller method Add

@Html.HiddenFor(model => model.EmpregadoID)