Understanding Bridge Pattern using .NET
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by David Simmonds
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Interface issues

There are two interfaces in the pattern.

The abstraction is a governing interface which tends to be a must-inherit or abstract-class.  It ensures that refined abstractions hold a reference to the concrete implementation.  It also ensures that they implement the abstract operation.

The implementation is an interacting interface which ensures that we can swap implementations at will without causing any hiccups.

Namespace/Scope/Accessor issues

Coding a public property into the abstraction which sets the implementer being used allows you to change implementers on the fly.

Listing 4

Public MustInherit Class Evaluation
  …
Public Property RatingRenderDevice() As Implementors.RatingRenderer
  …
  Set(ByVal Value As Implementors.RatingRenderer)
   RenderingDevice = Value
  End Set
End Property

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