Bridge Design Pattern

 UML diagram
 sample code in C#


Decouple an abstraction from its implementation so that the two can vary independently.

Frequency of use:   medium

UML class diagram


    The classes and/or objects participating in this pattern are:

  • Abstraction   (BusinessObject)
    • defines the abstraction's interface.
    • maintains a reference to an object of type Implementor.
  • RefinedAbstraction   (CustomersBusinessObject)
    • extends the interface defined by Abstraction.
  • Implementor   (DataObject)
    • defines the interface for implementation classes. This interface doesn't have to correspond exactly to Abstraction's interface; in fact the two interfaces can be quite different. Typically the Implementation interface provides only primitive operations, and Abstraction defines higher-level operations based on these primitives.
  • ConcreteImplementor   (CustomersDataObject)
    • implements the Implementor interface and defines its concrete implementation.

sample code in C#

This structural code demonstrates the Bridge pattern which separates (decouples) the interface from its implementation. The implementation can evolve without changing clients which use the abstraction of the object.

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// Bridge pattern -- Structural example

This real-world code demonstrates the Bridge pattern in which a BusinessObject abstraction is decoupled from the implementation in DataObject. The DataObject implementations can evolve dynamically without changing any clients.

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// Bridge pattern -- Real World example

This .NET optimized code demonstrates the same real-world situation as above but uses modern, built-in .NET features, such as, generics, reflection, object initializers, automatic properties, etc.

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// Bridge pattern -- .NET optimized

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Design Pattern
Framework 4.5

C# and VB.NET


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