Returning a specific action result from a request filter

I have a Filter Attribute registred globally in my MVC app that checks for a specific configuration based on a url. I plan to use a catchall in IIS so for domains that don't match, I want to display a 404 page without redirecting first.

So far I have:

public class GetWebsiteConfiguration : FilterAttribute, IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationContext filterContext)
    {
        string siteNoteFoundName = "SiteNotFound";
        string controllerName = "Error";
        if (filterContext.ActionDescriptor.ActionName != siteNoteFoundName && filterContext.ActionDescriptor.ControllerDescriptor.ControllerName != controllerName)
        {
            //Code removed for brevity
            IWebsiteService websiteSvc = new WebsiteService();
            Website website = websiteSvc.GetByDomain(HttpContext.Current.Request.Url.Host);
            if (website != null)
            {
                //load up the website's config - e.g. asset code etc.
            }
            else
            {
                //this is where I'm stuck - I want to return my action result SiteNotFound in my                  
                //controller Error as the filterContext.Result.
                //filterContext.Result = ??
            }
        }
    }
}

However, I can't figure out what to set filterContext.Result to. I tried controller.Execute() but that rendered the original page being requested, as well as the not found page. I know I can do a redirectResult, but I'd rather not...

Thanks in advance.

---

One way would be to create a base controller and move the SiteNotFound action in there.

public class BaseController : Controller {
    protected HttpNotFoundResult SiteNotFound(string statusDescription = null)
        {
            return new HttpNotFoundResult(statusDescription);
        }
}

Then you can simply assign the result as:

filterContext.Result = filterContext.Controller.SiteNotFound(<description>);

You also may want to set this (to avoid IIS into catching those errors)

controllerContext.HttpContext.Response.TrySkipIisCustomErrors = true;   

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