Redirecting to specified controller and action in asp.net mvc action filter

Question

I have written an action filter which detects a new session and attempts to redirect the user to a page informing them that this has happened. The only problem is I can not figure out how to make it redirect to a controller/action combo in an action filter. I can instead only figure out how to redirect to a specified url. Is there a direct way to redirect to a controller/action combo in an action filter in mvc2?

Answer 1

Rather than getting a reference to HttpContent and redirecting directly in the ActionFilter you can set the Result of the filter context to be a RedirectToRouteResult. It's a bit cleaner and better for testing.

Like this:

public override void OnActionExecuting(ActionExecutingContext filterContext) {     if(something)     {         filterContext.Result = new RedirectToRouteResult(             new RouteValueDictionary {{ "Controller", "YourController" },                                       { "Action", "YourAction" } });     }      base.OnActionExecuting(filterContext); } 

Answer 2

EDIT: The original question was about how to detect session logout, and then automatically redirect to a specified controller and action. The question proved much more useful as it's current form however.

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I ended up using a combination of items to achieve this goal.

First is the session expire filter found here. Then I wanted someway to specify the controller/action combo to get a redirect URL, which I found plenty of examples of here. In the end I came up with this:

public class SessionExpireFilterAttribute : ActionFilterAttribute {     public String RedirectController { get; set; }     public String RedirectAction { get; set; }      public override void OnActionExecuting(ActionExecutingContext filterContext)     {         HttpContext ctx = HttpContext.Current;          if (ctx.Session != null)         {             if (ctx.Session.IsNewSession)             {                 string sessionCookie = ctx.Request.Headers["Cookie"];                 if ((null != sessionCookie) && (sessionCookie.IndexOf("ASP.NET_SessionId") >= 0))                 {                     UrlHelper helper = new UrlHelper(filterContext.RequestContext);                     String url = helper.Action(this.RedirectAction, this.RedirectController);                     ctx.Response.Redirect(url);                 }             }         }          base.OnActionExecuting(filterContext);     } }