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Question

Problems with Partial Views in ASP.NET MVC 2

Answer 1

A:

You can create base class for your controllers and set it during creation if you need to query for it with every request:

public class BaseController : Controller
{
    public BaseController()
    {
        var catRepository = ...;
        ViewData["Categoriass"] = new SelectList(catRepository.FindAllCategorias().AsEnumerable(), "id", "nome", 3);
    }
}

That is not really efficient,because it will be executed with every controller. You can also create action filter which sets ViewData and apply it where needed.

LukLed 2010-04-22 12:13:42

Answer 2

+1 A:

I think you should create an ActionFilter and apply it on your controllers.

Create an action filter like this

public class DataForMasterPageAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        //initiate your repository

           var catRepository = ...;

        //then create the viewdata like so

        filterContext.Controller.ViewData["Categorias"] = new SelectList(catRepository.FindAllCategorias().AsEnumerable(), "id", "nome", 3);
    }

}

Then apply it on the controller and it will be available for all actions as well. Like so;

[DataForMasterPage]
public class CategoriaController : Controller
{
      public ActionResult Index()
      {
            ViewData["Message"] = "Welcome to ASP.NET MVC!";
            return View();
      }
}

On the partial view you just call the ViewData as usual, no need to change anything

<div class="editor-label">
        <%= Html.LabelFor(model => model.categoria_id) %>
    </div>
    <div class="editor-field">
        <%= Html.DropDownListFor(model => model.categoria_id, (SelectList)ViewData["Categorias"], "--Selecciona um--")%>

        <%= Html.ValidationMessageFor(model => model.categoria_id) %>
    </div>

Might have performance issues, but its one of the simplest ways to avoid setting the ViewData on every method.

Nick Masao 2010-04-22 14:27:54

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Problems with Partial Views in ASP.NET MVC 2

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