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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forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated.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.One Observer interface:云影又叮嘱了葫芦几句，便跟着刘云岚去了东院。故事讲述一个迫降的外星人哈利(图代克饰)在接受了自己科罗拉多小镇医生的新身份后，本带着秘密使命来到地球的他，最终提出了人生中的重大课题：人类值得拯救吗？以及为什么他们在吃披萨之前要折叠？《灯下罗曼史》因为离得近而看不见对方，对于终于要面对的那一刻，在爱情和友情之间我们会是什么样子呢？《难以置信》改编自 The Marshall Project 和 ProPublica 出版的普利策奖获奖文章《令人难以置信的强奸事件（An Unbelievable Story of Rape）》（作者是 T·克里斯琴·米勒和肯·阿姆斯特朗），以及美国生活（This American Life）广播剧集《Anatomy of Doubt》。本剧由荣获奥斯卡提名的苏珊娜·格兰特 和丽莎·查罗登科执导，讲述了难以言表的创伤、坚定的决心和惊人的适应能力。