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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.年轻、因此而傲慢的同级生？相泽里奈的眼睛、声音、温暖。Put the medicine part into cold water and boil. Wikipedia tells us that this method appeared in pharmacopoeia as early as the 14th century. However, people at that time liked to soak the medicine part in the liquid for a period of time before boiling.Late SeptemberNow look at Aamir Khan's expression,