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A minor buzzfest about type safe HttpSessionState handling going on now in the upcoming story queue at DNK. There are a couple of decent patterns being shared, so I figured I'd add in my own favorite type-safe session state handler.

The pattern uses generics (I loev generics) and works very well for data objects specifically designed to be stored in the session.

The pattern goes like this: A static SessionHelper class exposes a static, generic method for retrieving objects from the session state. The method has one type parameter for the type of object that the caller wants. The caller must supply a key under which the object is stored. Simple, no?

Yes. Too simple. But here is where the magic happens. Callers must also pass in a delegate that creates the default instance of the object. Essentially, this delegate allows the helper to "set" the value if not found. And the delegate uses generics, so the set logic is type safe as well.



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