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The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:The 23 design modes, in fact, the predecessors have summed up the ways to solve the problem. Their aim is to ensure the low coupling and high cohesion of the system. The principles guiding them are nothing more than the design principles of packaging change, single responsibility, interface-oriented programming, etc. After that, I will continue to share my WCF learning process. Although there are many WCF series in the blog park, I felt that it was not necessary to write them before, and I felt that I could use them. However, I did not write them. I always felt that the knowledge was not my own and I did not feel in-depth. Therefore, I still want to write such a series. I hope all bloggers will support me more.Install MinGw:在《师任堂》中，李英爱将化身朝鲜王朝时期著名女书画家、文学家、诗人“申师任堂”，演绎她不平凡的一生。该人物以其美德、聪慧，以及杰出的艺术造诣被视为韩国女性的典范，其人物形象甚至被印在了2009年正式发行的韩国最大的5万面值韩币上，而5千元韩币上的人物形象则是其儿子李珥— —朝鲜时代著名的儒学家。 据悉，《师任堂》的故事将在朝鲜时代和现代穿梭呈现，而李英爱也将分饰大学美术史讲师和师任堂两个角色。在偶然发现师任堂的日记和神秘的美人图之后，同样由李英爱饰演的美术讲师步入了对“师任堂”这一传奇女性的探秘之旅。 
　　《师任堂》剧方表示“虽然我们不敢说是在策划之初就考虑由李英爱来主演，但她所拥有的古典美和优雅的的形象与师任堂这个人物十分吻合。对于李英爱所塑造的师任堂，即便是想象一下也会为之心动”。 制作方表示该剧将在全部拍摄制作完成后于2017年初播出，敬请期待！History宣布直接预订10集UFO题材剧《蓝皮书 Blue Book》，该剧由David O’Leary执笔，根据现实美国空军的研究计划所改篇，背景50-60年代。在当时美国兴起一股UFO的热潮，美国空军为调查UFO而成立了蓝皮书计划/Project Blue Book来作相关研究。剧集讲述一个聪明的大学教授J. Allen Hynek被空军招揽，并由他处理蓝皮书计划中多达数千的未解案件，每一集皆会引用真实的案件，把UFO事件与美国那段具神秘感的历史结合起来。轻易去打扰是不智的行为。四个女孩Duchess、Sundae、Mimi和ViewViva住在Jam夫人的公寓里，这栋公寓有一个严格的规定，那就是：不允许男孩进入这栋公寓，但是她们的爱情却都发生在这栋公寓里……