设计原则与模式

单一职责原则（Single Responsibility Principle）

http://www.cnblogs.com/ztlyz/articles/1457692.html

http://www.uml.org.cn/sjms/201211023.asp#2

http://www.dofactory.com/net/design-patterns

http://stackoverflow.com/questions/1316743/are-there-any-design-patterns-used-in-the-net-framework

http://stackoverflow.com/questions/1673841/examples-of-gof-design-patterns-in-javas-core-libraries