全部模式解说：http://www.runoob.com/design-pattern/design-pattern-tutorial.html

进阶：http://www.cnblogs.com/Terrylee/category/36516.html

委托、观察者：

http://www.tracefact.net/CSharp-Programming/Delegates-and-Events-in-CSharp.aspx

http://www.cnblogs.com/joy99/p/7354233.html

http://www.cnblogs.com/joy99/p/7012770.html