C#中的事件的实现是通过委托直接实现的，所以代码只给出事件实现的代码示例，如果明白了委托，相信看懂本代码应该不难。
-C# Realize the incident is realized through the commission directly, so the code is given only to realize the events of the code sample, if commissioned to understand, I believe this code should not be difficult to understand.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001246s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.087599s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001205s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001930s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001175s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003610s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000993s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003204s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.024846s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002017s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 69492 [ RunTime:0.001396s ]
