Return View from ActionFilter

Question

I have an ActionFilter that checks if a parameter in the URL is valid. If it is not valid I have to render a View. I dont want to redirect, because I still need the ActionExecutingContext. Can that be done?

    public override void  OnActionExecuting(ActionExecutingContext filterContext)     {         Guid processIdentifier = (Guid)filterContext.RouteData.Values["processIdentifier"];         //if processIdentifier  not found render a view with message and some other objects in ViewData         filterContext.Controller.ViewData.ModelState.AddModelError("WrongProcessIdentifier", "The process-id you supplied is not valid");         base.OnActionExecuting(filterContext);     } 

Answer 1

HandleErrorAttribute had what I was looking for.

filterContext.Result = new ViewResult             {                 ViewName = "MessagePage",                 ViewData = filterContext.Controller.ViewData,                 TempData = filterContext.Controller.TempData             };