Piab And WCF Integrating The Policy Injection Application Block With WCF Services

摘要

One of the most important software design principles is the separation of different responsibilities within our applications. In service-oriented design, we separate applications into services and operations. In real life, however, implementation concerns tend to leak into the services. This is a problem not only in service-oriented design, but in object-oriented design as well. Enterprise Library 3.0 introduced the Policy Injection Application Block (PIAB) to solve this problem in object-oriented design. At the time of this writing, however, the latest version of Enterprise Library (3.1) doesn't directly support the integration of PIAB with Windows' Communication Foundation (WCF) services, so using PIAB to separate concerns in service-oriented applications might seem daunting. But, as you'll see, it's easy enough with the right techniques. Let's get started.