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I will never forget it. "Zhang Xiaobo said.红椒妹妹竟然变成这副模样了。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.The parameter object sender in DoSth is usually used to represent the initiator of the action, and EventArgs e is used to represent the parameters taken by the action.　　3. Auto-Tune才把青莲抱怀里坐稳，黄豆就将手中的肉对狗头上一抛，不等狗张嘴，又扯了回来，然后转身溜走了，青山再一挥鞭。