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Soon I saw Li Jianzhong's C # Object-Oriented Design Pattern Lecture on MSDN's Webcast. A very good series of lectures gave me a new understanding of design patterns. I realized that learning design patterns, specifically learning object-oriented design patterns, should start with learning object-oriented. "The principle of object-oriented is like understanding the rules of chess, and the design pattern is equivalent to a mess. I don't know what the rules look at." Since I have been doing ASP.NET development for the previous year, although I have been writing classes, learning Duwamish to make hierarchical architecture, typed DataSet and custom entity classes, it seems that I haven't used interfaces much in the past year, and I seldom use any polymorphism. In fact, the understanding of object-oriented programming is still very vague.2. Factory model"Deliberate practice" also breaks the superstition of the "10,000-hour law". In fact, the "10,000-hour law" is not strictly rigorous, but it is very popular because of a quantitative number.我不信有人不怕死。故事以马区家四个女儿的成长经历为主线，以家庭成员的感情纠葛为线索，描写了马区一家的天伦之爱。在战争的背景下，马区家的四姐妹中，无论是为了爱情甘于贫困的玫格，还是通过自己奋斗成为作家的乔，以及坦然面对死亡的贝丝和成熟活泼的艾美，虽然她们的理想和命运都不尽相同，但是她们都具有自强自立、善良友好的美好品质。故事叙述了她们对家庭的眷恋；对爱的忠诚以及对亲情的渴望。小葱跟秦淼惊呼出声，又有些兴奋。