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PS: In fact, I have seen all the design patterns a long time ago. However, I didn't write a blog, but I soon forgot it and didn't play any role. This time I summed it up in the form of a blog, and found that the effect was still obvious, because through this way of summarizing, I understood it more deeply, remembered it more firmly, and affected my thinking of realizing functions at ordinary times. Therefore, I encourage everyone to sort out what they have learned by taking notes, so that I believe they can understand it more deeply and better. I will write it down all the time and then plan to write a series of WCF articles.Before ();Evnet Handler--ChannelHandlerA4.1. 2 General inspection items.A. Men: 100m, 200m, 400m, 800m, 1500m, 5000, 1000m, marathon, 3000 hurdles, 110m hurdles, 400m hurdles, high jump, pole vault, long jump, triple jump, shot put, discus, hammer throw, javelin, decathlon, 20km walking, 50km walking, 4x100m relay, 4x400m relay;