HttpContext.Current.Session is null when routing requests


Question

Without routing, HttpContext.Current.Session is there so I know that the StateServer is working. When I route my requests, HttpContext.Current.Session is null in the routed page. I am using .NET 3.5 sp1 on IIS 7.0, without the MVC previews. It appears that AcquireRequestState is never fired when using the routes and so the session variable isn't instantiated/filled.

When I try to access the Session variables, I get this error:

base {System.Runtime.InteropServices.ExternalException} = {"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>.

While debugging, I also get the error that the HttpContext.Current.Session is not accessible in that context.

--

My web.config looks like this:

<configuration>
  ...
  <system.web>
    <pages enableSessionState="true">
      <controls>
        ...
      </controls>
    </pages>
    ...
  </system.web>
  <sessionState cookieless="AutoDetect" mode="StateServer" timeout="22" />
  ...
</configuration>

Here's the IRouteHandler implementation:

public class WebPageRouteHandler : IRouteHandler, IRequiresSessionState
{
    public string m_VirtualPath { get; private set; }
    public bool m_CheckPhysicalUrlAccess { get; set; }

    public WebPageRouteHandler(string virtualPath) : this(virtualPath, false)
    {
    }
    public WebPageRouteHandler(string virtualPath, bool checkPhysicalUrlAccess)
    {
        m_VirtualPath = virtualPath;
        m_CheckPhysicalUrlAccess = checkPhysicalUrlAccess;
    }

    public IHttpHandler GetHttpHandler(RequestContext requestContext)
    {
        if (m_CheckPhysicalUrlAccess
            && !UrlAuthorizationModule.CheckUrlAccessForPrincipal(
                   m_VirtualPath,
                   requestContext.HttpContext.User,
                   requestContext.HttpContext.Request.HttpMethod))
        {
            throw new SecurityException();
        }

        string var = String.Empty;
        foreach (var value in requestContext.RouteData.Values)
        {
            requestContext.HttpContext.Items[value.Key] = value.Value;
        }

        Page page = BuildManager.CreateInstanceFromVirtualPath(
                        m_VirtualPath, 
                        typeof(Page)) as Page;// IHttpHandler;

        if (page != null)
        {
            return page;
        }
        return page;
    }
}

I've also tried to put EnableSessionState="True" on the top of the aspx pages but still, nothing.

Any insights? Should I write another HttpRequestHandler that implements IRequiresSessionState?

Thanks.

1
45
10/20/2008 11:03:28 AM

Accepted Answer

Got it. Quite stupid, actually. It worked after I removed & added the SessionStateModule like so:

<configuration>
  ...
  <system.webServer>
    ...
    <modules>
      <remove name="Session" />
      <add name="Session" type="System.Web.SessionState.SessionStateModule"/>
      ...
    </modules>
  </system.webServer>
</configuration>

Simply adding it won't work since "Session" should have already been defined in the machine.config.

Now, I wonder if that is the usual thing to do. It surely doesn't seem so since it seems so crude...

52
2/10/2009 9:19:56 AM

Just add attribute runAllManagedModulesForAllRequests="true" to system.webServer\modules in web.config.

This attribute is enabled by default in MVC and Dynamic Data projects.


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