Dynamic Business Rules

I am creating an interface where users can build their own business rules out of domain specific objects at runtime, have those rules persisted in the database and then used by the application. Some of these are complex predicates and others require combinations of domain objects in what seems fairly complicated relations. So far I have looked into GoF, dynamics with eval, and CodeDom. Does anyone have suggestion on what should be used?

Solution

Actually, you can just develop your application with WF rules engine API without using WF. http://blogs.microsoft.co.il/blogs/bursteg/archive/2007/08/09/WF-Rules-Engine-without-Workflow.aspx This will save you from a lot of work.

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