Example of a custom cache provider for System.Runtime.Caching.ObjectCache.Host

Hello to all,

Apparently there is a way to implement a custom provider, or host, for the System.Runtime.Caching.ObjectCache object.  This seems to take the form of a System.IServiceProvider.  However, this interface has only one method, which is GetService. As such, I cannot determine which methods I need to implement within the service itself to serialize cached objects, for instance, to a SQL Server database.  

Is there an example of such functionality?  I have not yet found one after hours of searching.

Thank you!

Dan