accessing HttpContext.Request in a controller's constructor

I'm following this ASP.NET MVC tutorial from Microsoft:

My code is slightly different, where I'm trying to access HttpContext.Request.IsAuthenticated in the controller's constructor.

namespace SCE.Controllers.Application
{
    public abstract class ApplicationController : Controller
    {
        public ApplicationController()
        {
            bool usuario = HttpContext.Request.IsAuthenticated;
        }           
    }
}

The problem is that HttpContext is always null.

Is there a solution to this?

instead of putting your HttpContext.Request.IsAuthenticated in Controller level you should put it in Controller Base class that will be inherited in all of your controller with an override method of OnActionExecuting() method.

In your Controller base you should have

public class BaseController : Controller
{
    protected override void OnActionExecuting(ActionExecutingContext ctx) {
        base.OnActionExecuting(ctx);
        ViewData["IsAuthenticated"] = HttpContext.Request.IsAuthenticated;
    }
}

and all your Controller should inherit the BaseController class

public class ApplicationController : BaseController

now you should get the ViewData["IsAuthenticated"] in your Master page.

Edit

With the link you have given, and relating to what you have done, your ApplicationController is a Page Controller, not a Base Controller. In the example, ApplicationController is a Base Controller that is inherited by the HomeController but what you have done is you are placing the Action method inside your base controller which is the ApplicationController so your Action Index method will not be invoked when you call any page (Index page) that is not from the ApplicationController.

I would suggest you use:

 System.Web.HttpContext.Current.Request

Just remember System.Web.HttpContext.Current is threadstatic, but if you don't use additional thread the solution works.