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Design pattern - 工廠模式
https://rongli.gitbooks.io/design-pattern/content/chapter1.html

C#委託事件
http://blog.xuite.net/autosun/study/32614006-%5BC%23%5D+%E4%BA%8B%E4%BB%B6%E8%88%87%E5%A7%94%E6%B4%BE%EF%BC%88Delegate%EF%BC%89