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Call function chainFn1. PassRequest (); After that, the sender Fn1 function will be executed to print out 1, and then the string nextSuccessor; will be returned.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.老者正在出身，一个浑厚的声音在身后响起，回过头来，正好见到番邑主将苏角站在自己面前。Thank you for watching. I hope you didn't watch it late at night.The download looks like this: