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Chapter III Qualification LicensePS: 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forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated.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.Unfortunately, I offended a hooligan. He sent 300 people into the restaurant at the same time. These people look like normal customers, each saying "eat quickly". However, the capacity of the restaurant is only 30 people, so it is impossible to meet so many ordering demands at the same time. In addition, they blocked the door, with three floors inside and three floors outside. The normal dining guests could not get in at all, thus actually paralyzing the restaurant.是的。于是，凡奴颜谄媚、虚伪做作、刻板无趣和妄自尊大等情形，都被淘汰。Bingo is like thisOf course, it is necessary to press and hold the forced movement to ensure the correct trigger of Yang Ku's injury.