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Let's take a look at the original code: a Visitor class that holds the objects to be accessed.将皇帝哄得眉开眼笑，唤他坐到近前，说是方便翻译回话。PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.说了不少话，直到把小女娃又鼓起劲头，才放心。我们就没见过那么多东西。一个毫无机心的傻笨青年本是中俄边境开拓铁路的苦力，但屡遭奇遇的他却在乱世之中成为称霸一方的大军阀，他的一生是不平凡、传奇性和戏剧性的，他的遭遇见证了这个火熊年代的动荡和不安。本剧以嘻笑怒骂、辛辣嘲讽的风格细说乱世的荒谬、政治者的胡涂，个中意味深远。