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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.凭心而论，他家的日子自然也不错，可真没她说的这样有趣，规矩多多了。乡村不仅有传奇的爱情、更有村干部和相亲们的的鱼水之情，在新疆有一个小村庄这里生活着一群善良勇敢、充满希望的人们，他们在村支部的带领下争创乡　　不被人看好的二代新领队阿申，不得已只好把希望寄托在一个只会玩模拟器赛车的宅男杜杰克身上。没有实战经验的杜杰克并不具备参加比赛的实力，但为了追赶自己喜欢的莉莉，他不断努力与成长。凡事必有原因，何坤故作此举有明显报复的意思，但是自己与其并无恩怨。