如何检测用户何时使用会话超时注销？

Question

I am implementing web-push notifications, it works fine except one problem with the Session timeout. On our web, users will be log out after the Session is expired. However, at that time user may have closed the tab/ the browser. How can I detect the time the Session expired so that I can stop sending notifications to this user.

Update: I have the Session which will be expired after 30 mins (sessionState timeout = "30"). A user logins, and then closes the tab without logout; after 30 mins he will be logout. But he still receives notifications.

Answer 1

I´m not complettly sure if this is the anwser but maybe it help you.

First you can get a event when ever a user session is end. So in this event you can end the push notification.

To achive this just add the following line of code to your Global.asax

    protected void Session_End(object sender, EventArgs e)
    {
       //End push notification
    }

To achive that you are notice that a user close the browser or tap you need some javascript. In my example i do it with a HTTP-Request but you can also do it with some Sockets or everything else.

    function SendPostRequest(eMail) {
    try {
        $.post(
            "/apiacc/sessionend",
            { Value: eMail },
            function (data, status, xhr) {
            }
        );
    } catch (error) {
        //Error catching
    }
}

    function SetInterval(eMail) {
        SendPostRequest(eMail);
        window.setInterval(() => { SendPostRequest(eMail); }, 300000);
    }

And i just start the function when ever a site is loaded. So the JavaScript send every 5 Minute a Request. Which I save in the database (I use for example the E-Mailadress to authorization). On your Application start-up you create a background Task. Which will check every 5 minut if some of the session, dont get a call within the last 5 minutes. So you can end the session and the event in your global.asax will be called.

I hope this help?

Answer 2

My suggestion is,

1. save the username or any identification to session variable , Finally when Logout is clicked kill the session variable.

2. Another Option is TempData in ASP.NET , it stores the value for next page. check that variable first and then Give access to the Component.

http://www.tutorialsteacher.com/mvc/tempdata-in-asp.net-mvc

when the page is closed , tempdata will automatically killed.

Hope may this helpful. Thanks.