帮助！ ASP.NET C#项目无法访问线程或定时事件中的会话变量. [英] Help! ASP.NET C# Project Unable to access Session Variable in Thread or Timed Event.

问题描述

我在ASP.NET C#中有一个网页，该网页使用
创建会话变量

I have a webpage in ASP.NET C# that creates a session variable using

Session["State"]="State1";

我尝试在另一个名为WaitPage的页面中访问此会话变量，并且它有效.

当我尝试在WaitPage中的线程中访问此Session变量或尝试在定时事件中访问Session变量时，出现错误.

只有在配置文件或Page指令中将enableSessionState设置为true时，才可以使用会话状态.还请确保在应用程序配置的<configuration>\<system.web>\<httpModules>部分中包含System.Web.SessionStateModule或自定义会话状态模块.

我已经在两个网页中都启用了"EnableSessionState=true".
我在web.config的httpModules部分中具有必需的add name="Session" type="System.Web.SessionState.SessionStateModule".

为什么会出现此错误?你能帮我解决这个问题吗?

谢谢
Jobin Thomas

I try to access this session variable in another page called WaitPage and it works.

When i try to access this Session variable in a thread in WaitPage or try to access the session variable in a timed event, I get the error.

Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.SessionStateModule or a custom session state module is included in the <configuration>\<system.web>\<httpModules> section in the application configuration.

I have already enabled "EnableSessionState=true" in both webpages.
I have the required add name="Session" type="System.Web.SessionState.SessionStateModule" in httpModules section in web.config.

Why am I getting this error? Can you help me fix this?

Thanks
Jobin Thomas

推荐答案

您不能直接访问Thread中的Session 变量.

Session 与HttpContext.Current对象相关联.在处理Http请求时，将实例化HttpContext.Current ，从而实例化HttpContext.Current.Session.当进行http请求并呈现页面时，这些对象将超出范围.

在页面事件上启动的线程中，异步运行并且HttpContext.Current.Session为null.因此您无法访问Session对象.

一种方式:
将创建一个ashx or aspx页来执行会话操作，并允许Thread 通过WebRequest调用aspx/ashx页.

You cannot directly access the Session variable in a Thread.

Session is associated with HttpContext.Current object. When a Http request is under process a HttpContext.Current is instantiated and thus the HttpContext.Current.Session is instantiated. These objects gets out of scope when a http request is proceesed and page is rendered.

In Threads that are started on a page event runs async and there the HttpContext.Current.Session is null. so you cant access the Session object.

One way :
A ashx or aspx page would be created to do the session manipulation and let the Thread calls that aspx/ashx page through a WebRequest.

错误本身是不言自明的.

只有在配置文件或Page指令中将enableSessionState设置为true时，才可以使用会话状态.
这只是意味着，
您需要包括< pages ...> web.config中的属性:

Error in itself is quite self-explanatory.

Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive...
This simply means,
You need to include a <pages... > attribute in web.config:

<pages enableSessionState = "true" />

或
只需在<％@页面...％>中启用SessionState即可. ASPX页面中的指令，例如:

OR
Just Enable SessionState in the <%@ Page ...%> directive in your ASPX page, like:

<%@ Page enableSessionState = "true" %>

您可能需要启用会话存储.

请参考

http://support.microsoft.com/kb/317604 [

You may need to enable session store.

Refer this

http://support.microsoft.com/kb/317604[^]

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