Framework Design Guidelines: Sealed Classes

Continuing in our weekly blog post series that highlights a few of the new additions to the Framework Design Guidelines 2 nd edition .. This content is found in the Extensibility Mechanisms section of Chapter 6: Designing for Extensibility. It is interesting to watch as new development methodologies become more popular and how the color the guidelines… CONSIDER using unsealed classes with no added virtual or protected members as a great way to provide inexpensive yet much appreciated extensibility to a framework. Developers often want to inherit from unsealed classes so as to add convenience members such as custom constructors, new methods, or method overloads. For example, System.Messaging.MessageQueue is unsealed and thus allows users...(read more) ...