ASP.NET 2.0：为什么我的类在本地计算机上运行时可以访问 Session 对象，但在将其部署到服务器时却不能访问？
我有一个在 ASP.NET 2.0 应用程序中使用的自定义 MembershipProvider。在扩展成员资格提供程序的类内部，我有一个名为 AttemptLogin() 的函数，该函数在用户有效时设置会话变量。在该函数内部，有一些类似于以下内容的会话变量分配：
HttpContext.Current.Session["id"] = "12345";
global.asax 中的 Application_BeginRequest 函数正在调用 AttemptLogin()。当我在 Visual Studio 中打开该代码，然后通过单击“开始调试”在内置开发服务器中运行它时，该代码工作正常。但是，当我将其部署到我们的测试服务器（以 32 位模式运行 IIS 的 Windows 2003 Server 64 位）时，执行到上面的代码时会中断，并给出以下消息：
[NullReferenceException: Object reference not set to an instance of an object.] CustomMembershipProvider.AttemptLogin() in c:\Inetpub\wwwroot\Josh\App_Code\CustomMembershipProvider.cs:1097 ASP.global_asax.Application_BeginRequest(Object sender, EventArgs e) in c:\Inetpub\wwwroot\Josh\Global.asax:14 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +68 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
How can I access the session state success in这种情况？为什么它可以在本地运行而不是在服务器上运行？
I have a custom MembershipProvider that I'm using in an ASP.NET 2.0 application. Inside of the class that extends membership provider, I have a function called AttemptLogin() that sets session variables if the user is valid. Inside that function, are a number of session variable assignments similar to the following:
HttpContext.Current.Session["id"] = "12345";
AttemptLogin() is being called by the Application_BeginRequest function in global.asax. This code works fine when I open it in visual studio, and then run it in the built-in development server by clicking "Start Debugging". However, when I deploy it to our testing server (Windows 2003 Server 64-bit running IIS in 32-bit mode), execution breaks when it reaches the code above, giving me the following message:
[NullReferenceException: Object reference not set to an instance of an object.] CustomMembershipProvider.AttemptLogin() in c:\Inetpub\wwwroot\Josh\App_Code\CustomMembershipProvider.cs:1097 ASP.global_asax.Application_BeginRequest(Object sender, EventArgs e) in c:\Inetpub\wwwroot\Josh\Global.asax:14 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +68 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
How can I access the session state successfully in this situation? Why does it work locally and not on the server?
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会话变量在 Application_BeginRequest 处不可用，您应该稍后通过处理 Application_AcquireRequestState 在你的 global.asax 中，老实说我很困惑为什么你在开发盒上没有得到空引用。
Session Variables aren't available at Application_BeginRequest you should look later in the pipeline by handling the Application_AcquireRequestState in your global.asax, I'm honestly puzzled why you don't get a null ref on your dev box.
检查服务器上的 web.config 文件并确保启用了 sessionState 模式
Check the web.config file on the server and make sure sessionState mode is enabled