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Asked: 2026-05-25T02:14:14+00:00

I am using StructureMap to store a session object: config.For<SessionContext>().LifecycleIs(new HttpSessionLifecycle()); And everything works

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I am using StructureMap to store a session object:

config.For<SessionContext>().LifecycleIs(new HttpSessionLifecycle());

And everything works okay, so I can easy retrieve the session object with DI.

But now I need to switch my session from in-process to the database, but I receive the following error.

Unable to serialize the session state. In ‘StateServer’ and
‘SQLServer’ mode, ASP.NET will serialize the session state objects,
and as a result non-serializable objects or MarshalByRef objects are
not permitted. The same restriction applies if similar serialization
is done by the custom session state store in ‘Custom’ mode. —>
System.Runtime.Serialization.SerializationException: Type
‘StructureMap.Pipeline.MainObjectCache’ in Assembly ‘StructureMap,
Version=2.6.2.0, Culture=neutral, PublicKeyToken=e60ad81abae3c223’ is
not marked as serializable.

How can I solve this problem?

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1 Answer

  1. Editorial Team

    The problem was in StructureMap. I’ve added the [Serializable] attribute to the MainObjectCache class and some others and tested it out. It works now. The fix can be found in this pull request.

    I hope @Joshua Flanagan will merge these changes into the master branch soon and the problem will be finally solved.

    Edit:

    Thanks, I’ve pulled in your change (and a few others) and pushed a
    2.6.3 release. Edit your answer to say it was a bug fixed in 2.6.3 and
    mark it as the accepted answer. – Joshua Flanagan

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