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The meaning of cache agent is to cache the first run time, and when running the same again, it will be taken directly from the cache. The advantage of this is to avoid repeating the operation function once. If the operation is very complicated and consumes the performance, then using cache objects can improve the performance. We can first understand a simple cache column, which is the common addition and multiplication operations on the Internet. The code is as follows: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.Http://m.jiemian.com/article/2028492.html3. The customer groups are students, office white-collar workers, leisure groups, families, couples and other mass groups, 80% of which cover mainstream social groups.2018-03-02 10:28:21Events are similar to triggers and are started when something happens. When a statement is started on the database, the trigger is started, and the event is started according to the scheduled event. Because they are similar to each other, events are also called temporary triggers.