MVC4 : Interface object in Model

Question

I'm quite new about MVC. I have the following Model classes:

public class Store
{   
  public PriceList PriceListInfo { get; set; }
  public IStore storeData;
}    

public class PriceList
{
  public int id { get; set; }
  public string codice { get; set; }
}    

public interface IStore
{
 [...]
}    

public class Silo2Store : IStore
{
  public int S2 { get; set; }
  public int S3 { get; set; }
}

And i want use this model in my view:

@model Store

@Html.TextBoxFor(model => ((Silo2Store)Model.storeData).S3)

The corresponding Controller method is:

public ActionResult Customer()
{
    using (Store t = (Store)Session["Store"])
    {
        if (t.PriceListInfo == null)
        {
            t.PriceListInfo = new PriceList();
        }
        t.PriceListInfo.codice = "XXX";
        return View(t);
    }
}

And I'd like to retrieve the model in my Controller:

[HttpPost]
public ActionResult Customer(Store modelStore)
{
    var test = ((Silo2Store)Model.storeData).S3;
}

but Model.storeData attribute isn't initialized in my view, it's null. Then, I can't retrieve the value in my controller.

Should I change my model in anyway?

' public ActionResult Customer() { using (Store t = (Store)Session["Store"]) { if (t.PriceListInfo == null) { t.PriceListInfo = new PriceList(); } t.PriceListInfo.codice = "XXX"; return View(t); } }' — gorgonzola
– gorgonzola, Commented Mar 7, 2013 at 9:25
..When I check my Model in the view (in debug mode), the object "storeData" isn't null. It's NULL in controller side. — gorgonzola
– gorgonzola, Commented Mar 7, 2013 at 9:30
I think you'll have to define your own model binder for IStore. This article may be helpful as a starting point... — Yannick Blondeau
– Yannick Blondeau, Commented Mar 7, 2013 at 9:37
YES!....I've created my model binder. It seems to work now. Tnx. — gorgonzola
– gorgonzola, Commented Mar 7, 2013 at 11:07

Yannick Blondeau · Accepted Answer · 2013-03-07 11:19:32Z

1

You have to define your own model binder for IStore.

Taken from this article on MSDN Magazine about MVC Model Binding:

For example, even though the Microsoft .NET Framework provides excellent support for object-oriented principles, the DefaultModelBinder offers no support for binding to abstract base classes and interfaces.

answered Mar 7, 2013 at 11:19

Yannick Blondeau

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