Simple MVC Filter

public class TestFilter : ActionFilterAttribute

    {

       public override void   OnActionExecuted(ActionExecutedContext filterContext)

        {

            base.OnActionExecuted(filterContext);

            System.IO.File.AppendAllText(@"c:\log.txt", string.Format("{0}\r\n", filterContext.RequestContext.HttpContext.Request.Url.ToString()));

        }

    }

In global.asax:

  protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();

            WebApiConfig.Register(GlobalConfiguration.Configuration);

            GlobalFilters.Filters.Add(new TestFilter());

            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

        }