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2. Each receiver analyzes the request and then either processes it or passes it down.Http://willgenovese.com/office-ddeauto-attacks/Obviously, EventHandler is the delegate. Now use EventHandler to execute multiple methods.斯班赛（道恩·强森 Dwayne Johnson 饰）曾经是一名在赛场上叱咤风云的橄榄球明星，如今，已经退役的他必须忘记往日的那些令他热血沸腾的“峥嵘岁月”，并且尝试着在橄榄球队理财经理这个职位上找到人生新的方向和意义。城南市的击剑馆内，首富荣义翔（王奎荣饰）的公子荣维志（李竹饰）被一伙丧心病狂的黑社会份子暴打。维志受伤脱逃，巧遇俞雪儿（冯春哲饰）搭救。而俞雪儿父亲苦心经营多年的产品“金兰”系列在亚洲博览会上荣获金奖，满心欢喜的俞敏之（奚美娟饰）正是在这时候让女儿俞雪儿去机场迎接捧奖归来的父亲，不幸的是其父突遭车祸去世，企业面临破产的边缘。为争夺“金兰”品牌荣义翔指示其远房兄弟荣义飚准备强行霸占华韵。与此同时，瑞丰公司华诗远（马光泽饰）也产生了与华韵合作的意向。于是三家公司开始了残酷的争夺战。荣义飚让维志深夜潜入华韵化验室盗取绝密资料，黑暗中他将雪儿打昏。倭寇见状，黑衣和尚立刻吆喝起来，阵型稍作收缩，退出弓箭射程，排为一字长蛇，静候明军杀到。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.