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The second step is to transform the Upload constructor and create an instance object for each state subclass in the constructor: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forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated.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.《Singha Naka》中在科技加持下拥有4方神奇力量的少年们将担负起保卫世界的责任，再没有多久《Singha Naka》中的战争就要打响，拥有“地、水、风、火”等超越自然力量的孩子们将成奸除恶，保护世界免受侵害。有趣、热血、激动人心的电视剧马上就要来啦！这部奇幻电视剧改编自 Mala Khumjan的著作，由Phonpram Saimai, Wannasorn Soranut 和Patriya担任编剧进行改编，导演是Chutchawan Sasawatkalun，由TV TANDER公司出品。Singha 和Naka 是孤儿，从小他们被Yod师傅抚养教育长大，因为师傅事先知道当他们满25岁，他们会变成保护世界免受Mantra侵害的重要力量。Mantra 想要统治世界。可以拯救世界毁灭坏人的只有Singha和Naka这些具有地水风火之力的出生在第九位生肖并且是9月9日生的孩子! 但是随着Kathaleeya美女的到来，Singha和Naka之间的一切开始发生了改变。2017-02-04 22:51:00何况还有邓陵墨的那一干人，不仅仅都是这墨者行会的高手，其中还有不少在文化方面占优势的人，政治理念也有比价新颖，当然了政务能力也是很不错的。过去已经有几部优秀的纪录片说明了地球环境的巨变，并指出人类活动对地球的长期影响。《人类世:荣耀与毁灭》的独特之处，在于强调导致这种局面发生的过程，而不是单纯的陈述。