会话超时已处理，但在 ASP.NET 中仍然无法工作？
我在 web.config 中将超时设置为 30 分钟，如下所示
<forms name=".FormsAuth" loginUrl="/Login.aspx" timeout="30" protection="All"
slidingExpiration="true" >
<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424"
stateNetworkTimeout="300" sqlCommandTimeout="300" sqlConnectionString="data
source=127.0.0.1;Trusted_Connection=yes" cookieless="false" timeout="30" />
在母版页中。我将 SeTtime 设置为 30 分钟，这样它就可以重定向登录页面。
Dim sessionExpiredUrl As String = Request.Url.GetLeftPart(UriPartial.Authority) & "/labor"
Dim script As New StringBuilder()
script.Append("function expireSession(){ " & vbLf)
script.Append(String.Format(" window.location = '{0}';" & vbLf, sessionExpiredUrl))
script.Append("} " & vbLf)
script.Append(String.Format("setTimeout('expireSession()', {0}); " & vbLf, Me.Session.Timeout * 60000))
' Convert minutes to milliseconds
Me.Page.ClientScript.RegisterClientScriptBlock(Me.[GetType](), "expirescript", script.ToString(), True)
它工作正常。 30 分钟后，它会重定向到登录页面。但是如果我点击会话对象为“25 分钟”的页面。它抛出异常[NullReferenceException：未将对象引用设置到对象的实例。]。
我不明白为什么会话对象在 30 分钟前变成“空”以及如何处理这个问题？
编辑： 这里发生错误。
mUser = CType(Session("user"), User)
Dim processTime As String = mUser.GetLastProcessTime(lastProcessTime) // Error happening here
I set timeout for 30 mins in web.config like below
<forms name=".FormsAuth" loginUrl="/Login.aspx" timeout="30" protection="All"
slidingExpiration="true" >
<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424"
stateNetworkTimeout="300" sqlCommandTimeout="300" sqlConnectionString="data
source=127.0.0.1;Trusted_Connection=yes" cookieless="false" timeout="30" />
In master page page . I set SeTtime of 30 mins so it can redirect login page.
Dim sessionExpiredUrl As String = Request.Url.GetLeftPart(UriPartial.Authority) & "/labor"
Dim script As New StringBuilder()
script.Append("function expireSession(){ " & vbLf)
script.Append(String.Format(" window.location = '{0}';" & vbLf, sessionExpiredUrl))
script.Append("} " & vbLf)
script.Append(String.Format("setTimeout('expireSession()', {0}); " & vbLf, Me.Session.Timeout * 60000))
' Convert minutes to milliseconds
Me.Page.ClientScript.RegisterClientScriptBlock(Me.[GetType](), "expirescript", script.ToString(), True)
It is working fine . after 30 mins it is redirect to login page. But If I click pages that have session object at "25 MINS". It is throwing exception [NullReferenceException: Object reference not set to an instance of an object.].
I don't understand why session objects becoming "Null" before 30 mins and how to handle this?
Edit:
Error happening here.
mUser = CType(Session("user"), User)
Dim processTime As String = mUser.GetLastProcessTime(lastProcessTime) // Error happening here
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由于您使用的是 InProc，您的应用程序池可能会由于不活动而重置或关闭，从而使会话无效。看看这篇文章 看看是不是你的问题。
Since you are using InProc, possibly your app pool is reseting or shutting down due to inactivity, and that invalidates the session. Take a look at this article to see if it is your problem.
这是因为您设置了 SlidingExpiration = true，并且如果发出请求并且超过了一半的超时时间，则滑动过期会重置有效身份验证 cookie 的过期时间。
http://msdn.microsoft.com/en -us/library/system.web.security.formsauthentication.slidingexpiration.aspx
It's because you set SlidingExpiration = true and Sliding expiration resets the expiration time for a valid authentication cookie if a request is made and
more than half of the timeoutinterval has elapsed.http://msdn.microsoft.com/en-us/library/system.web.security.formsauthentication.slidingexpiration.aspx