9 Common Design Patterns
THERE ARE NUMEROUS books on software patterns, pattern languages, and antipatterns that address the very broad subject of patterns. Thus, this chapter provides guidelines and discussion related to a very limited set of patterns that are used frequently in the design of the .NET Framework APIs.
9.1 Aggregate Components
Many feature areas might benefit from one or more façade types that act as simplified views over more complex but also more powerful APIs. A façade that supports component-oriented design (see section 9.1.1) is called an aggregate component.
An aggregate component ties multiple lower-level factored types into a higher-level component to support common scenarios. An example might be an e-mail component ...
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