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Detecting Session Timeouts

Durata de viata a unei sesiune se poate seta din fisierul de configurare. Valoarea minima pe care o poate avea este 1 minut:
<sessionState mode="InProc"  timeout="1" />
Cand setati durata de viata la sesiune trebuie sa avegi grija ca IIS, by default face recyle la AppPool odata la 120 de minute. Ambele valori trebuie modificate daca doriti ca durata de viata a sesiunii sa fie mai mare.
Dintr-o aplicatie ASP.NET, folosid metoda Session_End din Global.asax nu o sa puteti prinde mereu acest eveniment. Pentru mai multe detalii: http://vunvulearadu.blogspot.com/2011/11/when-sessionend-is-called.html.
Pentru a putea detecta daca o sesiune este noua putem sa verificam valoarea propietatii Session.IsNewSession.Aceasta propietate este TRUE cand sesiune este noua.
Folosit aceasta propietate pe ASP.NET MVC3 ne putem declara un action filter prin intermediul caruia sa detectam daca sesiunea a expirat.
public class Sessi1onExpireFilterAttribute : ActionFilterAttribute 
{
         public override void OnActionExecuting( ActionExecutingContext filterContext ) 
     {
                 HttpContext context = HttpContext.Current;
                  if ( context.Session != null ) {
                      if ( context.Session.IsNewSession ) {
                          string cookies= ctx.Request.Headers[ "Cookie" ];
                         if ( ( cookies != null
              && ( cookies.IndexOf ( "ASP.NET_SessionId" ) >= 0 ) ) {
                              context.Response.Redirect ( "~/Default/Index" );
                         }
                     }
                 } 
              base.OnActionExecuting ( filterContext );
     } 
}
Nu este de ajuns sa verificam valoarea propietatii IsNewSession. Trebuie sa ne dam seama daca sesiune a expirat sau este primul access a utilizatorului la noi pe site. Acest lucru este destul de usor de facut daca verificam avem deja ceva in cookies. Putem sa punem noi in cookies o anumita valoare sau sa verificam daca in cookies exista “ASP.NET_SessionId”.

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