问题
We have several pages in our ASP.net Ajax application which auto refresh the UpdatePanels contents based on a timer event but the problem is that we have a requirement to timeout the web session and the auto refresh is preventing that.
Is there a way to prevent the timer postback event from modifying the web session or any other alternate solution to allow the web session to timeout while auto refreshing the UpdatePanel contents?
Here is an example to illustrate this problem. I set the session timeout to 3 minutes and have a timer in the UpdatePanel that ticks every minute and modifies the contents of the UpdatePanel based on the current state. After logging in, I navigate to this page and do nothing for 5 minutes and then try and click on another page and I am still logged in since the session didn't time out.
回答1:
You may track the activity of the user on the client side. If there is no mouse move etc. you could log the user out using the Sys.Services.AuthenticationService class (part of Microsoft AJAX Library 1.0). You could pop a confirmation before you do the actual log out, so that the user may cancel it if he is present. When logged out you could pop a message to the user saying that he was automatically logged out because of inactivity.
How my solution would solve your scenario:
You set the session timeout to 3 minutes and have a timer in the UpdatePanel that ticks every minute and modifies the contents of the UpdatePanel based on the current state. After logging in, you navigate to this page and do nothing. After 3 minutes of no activity you pop a confirmation to the user asking him to cancel automatic log out using the Sys.Services.AuthenticationService. If the user still takes no action you log him out after a few seconds. You pop a "logged out message" that the user will see when he returns to the browser after 5 minutes. When he then click on another page he is not logged in.
来源：https://stackoverflow.com/questions/770594/how-do-i-prevent-resetting-session-timeout-when-updatepanels-content-is-refresh