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　　张奕因为在大学时留下的“后遗症”---没有毕业证，在找工作中四处碰壁，但又不敢对自己青梅竹马的女朋友李小华吐露真相。BBC大热喜剧《伦敦生活》宣布续订第2季，将于2019年回归。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.珊瑚点头道：那就是了。I won't repeat much about the profound and pure theoretical explanation here. After all, the written explanation is too lenient. I'm going to say something simple and visible here. Let's start now.