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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forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated.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.(four) other provisions of the medical security management.At that time, how will you choose? Can you be ruthless and drive away this monster that cannot be rescued?老宰相一生兢兢业业，到头来。和关中到巴蜀这一段一样，也是栈道和山路，所以越军想要西进并不容易。　　时杜结识二女鬼，紫云，紫花，对紫花尤其迷恋，二人展开旖旎烂漫的爱情，惜此事被花之主人三魔查悉，遂向花四家压力，花终于在无可选择的情况下，自我了断以结束此段哀怨的感情，此事更间接令钟与三摩展开连番恶斗。