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Design Patterns in C# by Steven John Metsker

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Chapter 6. Bridge

The BRIDGE pattern focuses on the design of an abstraction. The word abstraction refers to a class that relies on a set of abstract operations, where there are several possible implementations of the set of abstract operations.

The ordinary way to implement an abstraction is to create a class hierarchy with an abstract class at the top that defines the abstract operations; each subclass in the hierarchy provides a different implementation of the set of abstract operations. However, this approach becomes insufficient when you need to subclass the hierarchy for some other reason.

You can create a bridge by moving the set of abstract operations to an interface, so that an abstraction will depend on an implementation of the interface. ...

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