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The 23 design modes, in fact, the predecessors have summed up the ways to solve the problem. Their aim is to ensure the low coupling and high cohesion of the system. The principles guiding them are nothing more than the design principles of packaging change, single responsibility, interface-oriented programming, etc. After that, I will continue to share my WCF learning process. Although there are many WCF series in the blog park, I felt that it was not necessary to write them before, and I felt that I could use them. However, I did not write them. I always felt that the knowledge was not my own and I did not feel in-depth. Therefore, I still want to write such a series. I hope all bloggers will support me more.《致命追踪》讲述的是一个警匪谍战斗智斗勇的故事。卧底警察展昭阳（钱泳辰饰）被指派调查一起毒品制造案。化身为快递员的他在调查过程中遭遇到警匪两方的追捕和围杀，不能亮明身份的他只能依靠自己去破解重重迷索。在这个时候，他的好朋友丁琪（肖茵饰）被牵扯进来，展昭阳既要保护朋友又要躲避两方追杀，经历了多次遇险，甚至被活埋。在他的努力下，毒品案的真相渐渐冒出水面……　　五个身世飘零的孤儿，因爱而齐聚一堂，虽无血缘，却情比金坚。过一会，等哭声低了，才轻声道：你是个聪明的孩子。百无一用的地主少爷徐福贵出人意料地娶到了十分漂亮、知书达理的米行老板千金陈家珍，却在婚后赌掉了徐家的全部家产；沦为佃农的一无所有的福贵，却出人意料地脱胎换骨，开始真正拥有了亲情和爱情……该剧讲述了国企干部齐本安（靳东 饰）临危受命，团结广大干部群众，加强党风廉政建设，挽回流失的国有资产，带领企业在经营困境中成功突围的故事。老板很厉害，但是二爷也不差啊。