help to view multiple line pass to a Controller

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help to view multiple line pass to a Controller

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#1 by (3 votes)
#2 by (1 votes)

1

Well, I have a simple model for studies. There are 3 tables, Person, Allergy and Person Allergy. Being that a person can have several allergies.

My person template is:

 public partial class Pessoa
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public Pessoa()
        {
            this.AlergiasPessoas = new HashSet<AlergiasPessoas>();
        }

        public int ID { get; set; }
        public string nome { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<AlergiasPessoas> AlergiasPessoas { get; set; }
    }
}

In my View Create I get the data from the allergy table in a listbox where the user can select multiple.

@Html.ListBox("Alergia", (MultiSelectList)ViewBag.Alergia, new { @id = "Fonte", @class = "form-control", @onclick = "teste(this)", @style = "height:150px" })

When sending the data to the Concroller by submit, I hope to record both the person and the allergies selected in the PersonAllergy table

[HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "ID,nome")] Pessoa pessoa, ALGO_QUE_TRAGA_OS_ITENS_SELECIONADOS)
    {
        if (ModelState.IsValid)
        {
            db.Pessoa.Add(pessoa);
            db.SaveChanges();

            foreach (var item in ALGO_QUE_TRAGA_OS_ITENS_SELECIONADOS)
            {
                AlergiasPessoas alergiasPessoas = new AlergiasPessoas();
                alergiasPessoas.ID_Pessoa = pessoa.ID;
                alergiasPessoas.ID_Alergia = item.ID;
                db.AlergiasPessoas.Add(alergiasPessoas);
            }
            db.SaveChanges();

            return RedirectToAction("Index");
        }

        return View(pessoa);
    }

I'm not sure how to receive the selected items in the action create. Any suggestions?

asp.net-mvc asp.net-mvc-5

asked by anonymous 14.08.2017 / 15:55

2 answers

1

Hello, one of the ways to do this is to use a ViewModel, which will route information from the controller to the view and return from the View to the controller. See the following link for a reference on how these components work in detail and an example: Microsoft Docs: Views And ViewModels

About your case, you can do the following: 1- Create a ViewModel containing a property with the Person class.

2 - Referencing the ViewModel in view @model ViewModelPessoa

3- Use the ViewModel to load the data in the view and submit the data in a form:

@using (Html.BeginForm())
{
        @Html.ListBoxFor(m => m.Pessoa.AlergiasPessoasSelecionada, m.AlergiasPossiveis, new { id = ListAlergiaPessoas })
        <br />
        <input type="submit" value="Submit" />
}

14.08.2017 / 16:58

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score 3 · Accepted Answer

@AlamBique, the @Html.ListBox will pass an array with the selected Ids in the View. You can pick up the way you were doing even using a foreach. Change your POST method to ... public ActionResult Create([Bind(Include = "ID,nome")] Pessoa pessoa, int[] Alergia)