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你的生命只有不多的时间,如果有机会重返15岁,你会怎么抓住这最后的机会呢,五位55岁的人,他们分别是唱歌走音的歌手,单身老同志,优秀配音员,失败拳手,严格的女教师,有一天他们几个突然都变成了15岁的孩子郑氏见她居然笑了，心中顿时苦涩不已。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forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated.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.只是在没吃的、饿得没法的时候，才会过来找小女娃讨着吃。故事叙述一名对人和灵都和蔼可亲、拥有超强灵感的天然呆少女天海响，她不仅时常会遭遇灵异现象，甚至还能跟灵泡茶闲聊，所发生的日常。Left Slot BaozhuNext, we will finish writing other codes. First, we will define the Upload class. The objects that control the upload process will be created from the Upload class: