This generic filter provides a base class (and a concrete class) that does the bare minimum that a filter should do. This filter will go through the supplied criteria when MatchesCriteria() is called and does the comparisons provided by the criteria. Derived classes can override any or all of the MatchesCriteria() methods and replace the logic used to decide whether CUs should be included. Calling MatchesCriteria() methods on the base class will provide the default behavior of simply checking the passed criteria. If the passed criteria is irrelevant, then override the methods and provide your own implementation and don't call the base class methods.

public abstract class CuFilter<T> : ICuFilter, ICuFilter<T>  

'Declaration
 
Public MustInherit Class CuFilter(Of T) 
   Implements ICuFilter, ICuFilter(Of T) 

'Usage
 
Dim instance As CuFilter(Of T)