I lost my data on submit MVC 3 - asp.net-mvc-3

Question

I have a MVC 3 application with entity framework.
In my page I use a custom Model that contains all objects I use. The page is rendered perfectly, but when I press the submit button my object loses the data.
This is my custom model:
public class ControleAcessoModel
{
private List<Controle> controles = new List<Controle>();
public GRUPO_ACESSO_TB grupo_acesso_tb { get; set; }
public List<Controle> Controles
{
get
{
return controles;
}
}
public void AddTela(byte id, string nome)
{
Controle ctrl = new Controle();
ctrl.ID_TELA = id;
ctrl.NM_TELA = nome;
controles.Add(ctrl);
}
public class Controle
{
public bool Selecionado { get; set; }
public byte ID_TELA { get; set; }
public string NM_TELA { get; set; }
public bool FL_SALVAR { get; set; }
public bool FL_ALTERAR { get; set; }
public bool FL_EXCLUIR { get; set; }
}
}
this is my Razor Html code:
#using (Html.BeginForm())
{
#Html.ValidationSummary(true)
<table>
<tr>
<th>Salvar</th>
<th>Editar</th>
<th>Excluir</th>
<th>Tela</th>
</tr>
#foreach (var item in Model.Controles)
{
<tr>
<td style="text-align: center">
#Html.EditorFor(modelItem => item.FL_SALVAR)
</td>
<td style="text-align: center">
#Html.EditorFor(modelItem => item.FL_ALTERAR)
</td>
<td style="text-align: center">
#Html.EditorFor(modelItem => item.FL_EXCLUIR)
</td>
<td>
#Html.DisplayFor(modelItem => item.NM_TELA)
</td>
</tr>
}
</table>
<p>
<input type="submit" value="Salvar" />
</p>
}
This is my create code, where I put the data on database.
Is in this part, that my object controleacessomodel is empty.
[HttpPost]
public ActionResult Create(ControleAcessoModel controleacessomodel, byte id)
{
if (ModelState.IsValid)
{
for (int i = 0; i < controleacessomodel.Controles.Count; i++)
{
if (ValidaSelecao(controleacessomodel.Controles[i]))
{
PERMISSAO_GRUPO_ACESSO_TELA_TB permissao = new PERMISSAO_GRUPO_ACESSO_TELA_TB();
permissao.ID_GRUPO_ACESSO = controleacessomodel.grupo_acesso_tb.ID_GRUPO_ACESSO;
permissao.ID_TELA = controleacessomodel.Controles[i].ID_TELA;
permissao.FL_SALVAR = controleacessomodel.Controles[i].FL_SALVAR;
permissao.FL_ALTERAR = controleacessomodel.Controles[i].FL_ALTERAR;
permissao.FL_EXCLUIR = controleacessomodel.Controles[i].FL_EXCLUIR;
db.PERMISSAO_GRUPO_ACESSO_TELA_TB.AddObject(permissao);
}
}
db.SaveChanges();
return RedirectToAction("Edit", "GrupoAcesso", new { id = id });
}
return View(controleacessomodel);
}
Why my object is empty after submit?

Answer 1

It's not possible to use the Foreach loop construct as the generated ids will be not be correct, therefore MVC is not able to map the values back to the model. You need to use a for loop instead:
#for (int i = 0 ; i < Model.Controles.Count; i++)
{
<tr>
<td style="text-align: center">
#Html.EditorFor(m => m.Controles[i].FL_SALVAR)
</td>
<td style="text-align: center">
#Html.EditorFor(m => m.Controles[i].FL_ALTERAR)
</td>
<td style="text-align: center">
#Html.EditorFor(m => m.Controles[i].FL_EXCLUIR)
</td>
<td>
#Html.DisplayFor(m => m.Controles[i].NM_TELA)
</td>
</tr>
}
Phil Haack write a good blog post about this. Also Scott Hanselman wrote a nice post too.