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Command mode belongs to the behavior mode of an object. Command mode encapsulates a request or operation into an object, and separates the responsibility of issuing the command from the responsibility of executing the command through abstraction of the command. The implementation of command mode can provide the functions of revocation and recovery of commands. The specific structure diagram is shown below.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.(6) Other conditions stipulated by laws and administrative regulations.心血败在一个蠢人的嘴上，含冤而死。周杰伦的朋友全情参与，方文山、刘德华、五月天、萧敬腾、林俊杰、谢霆锋、陈建州等将和周杰伦一起周游世界，每个城市一首周杰伦歌曲，全程无脚本拍摄，周杰伦全程参与，魔术技能大秀，去巴黎解码《告白气球》，去新加坡看林俊杰《听妈妈的话》，和谢霆锋富士山下看《最长的电影》。(1) Basic Description