Convert View to Controller Values

Question

I need you to byte[]Descricao, when sent to my view displays the text as string for the user to manipulate within the TextArea, when I click in saving need to be converted again to byte[] for that the Controller find the sent template.

Class:

public class Carta {
    public virtual int Id {get; set;}
    public virtual byte[] Descricao {get; set;}
}

Controller:

public ActionResult MinhaCarta(int? Id){
     var carta = Id != 0 ? sessao.GetCarta(Id) : new Carta();

     View(carta);
}

public ActionResult SalvarCarta(Carta model){
     ...
}

View:

@model Carta
@{
   ViewBag.Title = "Minha Carta"; 
}


@using ((Ajax.BeginForm("SalvarCarta", "Mensagem",  new AjaxOptions { HttpMethod = "POST" })))
{
    @Html.Hidden(m => m.Id)
    @Html.TextAreaFor(m => m.Descricao)

    [SALVAR]
}

It would be possible to validate via Javascript maybe, within the onClick of Save?

Answer 1

Do the following then, in your class Carta modify, so that when the data is received by the user screen it assigns in the array de bytes automatically the values and when the ORM assign the value to the array de bytes it generates the information in text to be shown in View:

Class:

public class Carta
{
    public virtual int Id { get; set; }

    private byte[] _descricao;
    public virtual byte[] Descricao
    {
        get
        {
            return _descricao;
        }
        set
        {
            _descricao = value;
            _descricaoString =
                System.Text.Encoding.UTF8.GetString(value);
        }
    }

    private String _descricaoString;
    public string DescricaoString
    {
        get
        {   
            return _descricaoString;
        }
        set
        {
            _descricaoString = value;
            Descricao = 
                System.Text.Encoding.UTF8.GetBytes(value);
        }
    }
}

manages the Viewwith these changes that will result in:

View:

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

    <div class="form-horizontal">
        <h4>Carta</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.Id)

        <div class="form-group">
            @Html.LabelFor(model => model.DescricaoString)
            <div class="col-md-10">
                @Html.EditorFor(model => model.DescricaoString)
                @Html.ValidationMessageFor(model => model.DescricaoString, "")
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Save" class="btn btn-default" />
            </div>
        </div>
    </div>
}

with these modifications the data is already ready for View and any attempt to change the data is converted to the format of array de bytes, analyzing this if the whole mapping is correct and the field DescricaoString has to be ignored in its model, so that the ORM do not try to update this field which is only even a way to show and retrieve information:

Modifications to the Mapping of this class by adding:

map.IgnoreProperty(p => p.DescricaoString);

_References:

• C# - Creating classes, objects, constructor methods and accessors
• Writing custom attributes
• Byte arrays
• Mapping private properties
• Fluent-nhibernate
• Classes and objects