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有了。In the event that the button button is pressed, Context no longer directly performs any substantive operations, but delegates the request to the currently held status object for execution through self.currState.buttonWasPressed (), with the following code: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.期待众多仙佛人魔妖打到天崩地裂。秦枫面无表情地说道：撞上了就撞上了。坐在营帐中的曹邦辅却是十足苦大仇深的样子，眉头紧锁，皱纹深陷，虽疲惫不堪却依然要瞪眼撑着：俞总兵，倭人别的不行，蛮劲足得很，不识好歹，不知进退，越是这种时候，越不能放松。