User78336405 posted
Hi,
An application block is reusable and extensible source code-based guidance that simplifies development of common policy injection functionality in .NET Framework applications. Crosscutting concerns are the necessary tasks, features, or processes that are
common across different objects—for example, logging, authorization, validation, and instrumentation. Developers can use the Policy Injection Application Block to specify crosscutting behavior of objects in terms of a set of policies. A policy is the combination
of a series of handlers that execute when client code calls methods of the class and—with the exception of attribute-based policies—a series of matching rules that select the classes and class members (methods and properties) to which the application block
attaches the handlers. Attribute-based policies rely on attributes directly applied to the members of the target class to identify those to which the application block will apply policies. The result is a mechanism for declaratively applying a chain of handlers
to members of the target class instance. This chain of handlers is a pipeline.
For more details, please refer:http://msdn.microsoft.com/en-us/library/cc309507.aspx ,
http://www.devx.com/dotnet/Article/34517 .
