Problem saving checkbox text value to my database

Question

You wanted to save the days of the week selected by the user, storing the contents of the label as string.

What comes to the controller when I select all checkboxes

Domingo false
Segunda-Feira false
Terça-Feira false
Quarta-Feira

wanted to save as string the text of label of checkbox in my database, and discard the "falses".

Controller:

private MultiSelectList GetDias(string[] selectedValues)
{
    List<DiasSemana> Dias = new List<DiasSemana>()
    {
        new DiasSemana() { ID = 0, Dia= "Domingo" },
        new DiasSemana() { ID = 1, Dia= "Segunda-Feira" },
        new DiasSemana() { ID = 2, Dia= "Terça-Feira" },
        new DiasSemana() { ID = 3, Dia= "Quarta-Feira" },
        new DiasSemana() { ID = 4, Dia= "Quinta-Feira" },
        new DiasSemana() { ID = 5, Dia= "Sexta-Feira" },
        new DiasSemana() { ID = 6, Dia= "Sábado-Feira" },
    };

    return new MultiSelectList(Dias, "ID", "Dia", selectedValues);
}

Get:

public ActionResult CriarGrupo()
{     
    // acedendo a um conjunto de valores de uma classe
    ViewBag.Daylist = GetDias(null);

    return View();
}

Post:

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult CriarGrupo([Bind(Include = "GrupoID,AnoPastoral,HoraInicio,DiaSessao,AnoCatequese,LetraGrupo,Sala,Observacoes")] Grupo grupo, params string[] SelectDias)
{
    grupo.DiaSessao = SelectDias[0] + SelectDias[1] + SelectDias[2] + SelectDias[3] + SelectDias[4] + SelectDias[5] + SelectDias[6];

    if (ModelState.IsValid)
    {
        db.Grupo.Add(grupo);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    return View(grupo);
}

View:

<div class="form-group">
    @Html.LabelFor(model => model.DiaSessao, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-3">
        @foreach (var item in (MultiSelectList)ViewBag.Daylist)
        {
            //  @Html.CheckBox("SelectDias", new { @class = "checkbox-inline", @value = @item.Text })
            <input type="checkbox" name="SelectDias" value="@item.Text" class="checkbox-inline" />
            @Html.Label(item.Text, new { @class = "control-label" })

            <br />
        }
        </div>
    </div>

Answer 1

You can save the numbers of each day as one string:

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult CriarGrupo([Bind(Include = "GrupoID,AnoPastoral,HoraInicio,DiaSessao,AnoCatequese,LetraGrupo,Sala,Observacoes")] Grupo grupo, params string[] SelectDias)
{
    if (ModelState.IsValid)
    {
        grupo.DiaSessao = (SelectDias[0] == "true" ? "1 " : "") + 
                          (SelectDias[1] == "true" ? "2 " : "") + 
                          (SelectDias[2] == "true" ? "3 " : "") + 
                          (SelectDias[3] == "true" ? "4 " : "") + 
                          (SelectDias[4] == "true" ? "5 " : "") + 
                          (SelectDias[5] == "true" ? "6 " : "") + 
                          (SelectDias[6] == "true" ? "7 " : "");

        db.Grupo.Add(grupo);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    return View(grupo);
}

When it’s time to set up the form:

var grupo = db.Grupos.FirstOrDefault();
ViewBag.Daylist = GetDias(grupo.DiaSessao.Split());