ASP.NET Push Redirect on Session Timeout

Question

I\'m looking for a tutorial, blog entry, or some help on the technique behind websites that automatically push users (ie without a postback) when the session expires. Any h

Answer 1

I'm using MVC3 ASp.net as beginner, I tried many solution to solve my session problem ( since i'm using Session variable in my code, and after timeout i didn't have session values while i'm keep using it And I just find that my problem was in config file. the timeout between Authentication and sessionState should be so close. so they Killed (empty) at the same time // add timeout 1 and 2 for testing.. it's should be at least 29 and 30

I used others way it's work too :

Starting from :

    protected void Session_Start(object src, EventArgs e)
    {
        if (Context.Session != null)
        {
            if (Context.Session.IsNewSession)//|| Context.Session.Count==0)
            {
                string sCookieHeader = Request.Headers["Cookie"];
                if ((null != sCookieHeader) && (sCookieHeader.IndexOf("ASP.NET_SessionId") >= 0))
                {
                    //if (Request.IsAuthenticated)
                     FormsAuthentication.SignOut();
                     Response.Redirect("/Account/LogOn");
                }
            }
        }

    }

    protected void Session_End(object sender, EventArgs e)
    {
     //Code that runs when a session ends. 
     //Note: The Session_End event is raised only when the sessionstate mode 
     //is set to InProc in the Web.config file. If session mode is set to StateServer
      //or SQLServer, the event is not raised. 
        Session.Clear();          
    }

And :

public class SessionExpireFilterAttribute : ActionFilterAttribute
{

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        HttpContext ctx = HttpContext.Current;

        // check if session is supported
        if (ctx.Session != null)
        {

            // check if a new session id was generated
            if (ctx.Session.IsNewSession)
            {
                // If it says it is a new session, but an existing cookie exists, then it must
                // have timed out
                string sessionCookie = ctx.Request.Headers["Cookie"];
                if ((null != sessionCookie) && (sessionCookie.IndexOf("ASP.NET_SessionId") >= 0))
                {
                    ctx.Response.Redirect("~/Home/LogOn");
                }
            }
        }

        base.OnActionExecuting(filterContext);
    }
}

And even worked with Ajax to solve session issuse:

    protected override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (Session.Count == 0 || Session["CouncilID"] == null)
            Response.Redirect("/Account/LogOn");

        if (Request.IsAjaxRequest() && (!Request.IsAuthenticated || User == null))
        {
            filterContext.RequestContext.HttpContext.Response.StatusCode = 401;
        }
        else
        {
            base.OnActionExecuting(filterContext);
        }
    }

    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
    public class AuthorizeUserAttribute : AuthorizeAttribute
    {
        protected override bool AuthorizeCore(HttpContextBase httpContext)
        {
            if (!httpContext.Request.IsAjaxRequest())
            {//validate http request.
                if (!httpContext.Request.IsAuthenticated
                    || httpContext.Session["User"] == null)
                {
                    FormsAuthentication.SignOut();
                    httpContext.Response.Redirect("~/?returnurl=" + httpContext.Request.Url.ToString());
                    return false;
                }
            }
            return true;
        }

        protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
        {
            if (filterContext.HttpContext.Request.IsAjaxRequest())
            {
                filterContext.Result = new JsonResult
                {
                    Data = new
                    {
                        // put whatever data you want which will be sent
                        // to the client
                        message = "sorry, but you were logged out"
                    },
                    JsonRequestBehavior = JsonRequestBehavior.AllowGet
                };
            }
            else
            {
                base.HandleUnauthorizedRequest(filterContext);
            }
        }

    }