亲测有效，C#通过配置文件，线程定时递归删除文件夹下所有文件，包括子文件夹中的文件，log4net记录删除日志

2018-07-20 15:07:49,357 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_100002_3164142.trn 2018-07-20 15:07:49,378 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_123003_0174231.trn 2018-07-20 15:08:04,450 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_170002_7566764.trn 2018-07-20 15:08:04,463 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_080002_5791221.trn 2018-07-20 15:08:04,465 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_090002_1762444.trn 2018-07-20 15:08:04,467 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_093002_1698059.trn 2018-07-20 15:08:04,470 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_113002_4560526.trn 2018-07-20 15:08:09,485 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_113010_5651132.trn 2018-07-20 15:08:09,487 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_193002_1658366.trn 2018-07-20 15:08:09,490 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_200002_1281981.trn 2018-07-20 15:08:09,492 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_143002_1551748.trn 2018-07-20 15:08:09,494 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_160002_7130604.trn 2018-07-20 15:08:14,508 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_163002_6910219.trn 2018-07-20 15:08:14,510 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_170002_3725829.trn 2018-07-20 15:08:14,512 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_210002_2742750.trn 2018-07-20 15:08:14,516 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_15_103002_1628362.trn 2018-07-20 15:24:44,257 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_001502_5511647.bak 2018-07-20 15:24:44,270 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_090002_5476915.trn 2018-07-20 15:24:44,272 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_120002_8522612.trn 2018-07-20 15:24:44,274 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_140009_9089198.trn 2018-07-20 15:24:44,274 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_143002_6796686.trn 2018-07-20 15:24:44,274 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_150002_3612296.trn 2018-07-20 15:24:44,276 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_153002_3547911.trn 2018-07-20 15:24:44,276 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_160002_0987522.trn 2018-07-20 15:24:44,277 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_163002_3419141.trn 2018-07-20 15:24:44,277 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_173002_6878378.trn 2018-07-20 15:24:44,277 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_190002_1849215.trn 2018-07-20 15:24:44,278 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_210002_6427685.trn 2018-07-20 15:24:44,282 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_213002_4647297.trn 2018-07-20 15:24:44,283 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_230002_1178137.trn 2018-07-20 15:24:44,284 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_12_233001_9709749.trn 2018-07-20 15:24:44,286 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_100001_8201669.trn 2018-07-20 15:24:44,288 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_103003_2645309.trn 2018-07-20 15:24:44,289 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_140002_6578606.trn 2018-07-20 15:24:44,290 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_143002_6982222.trn 2018-07-20 15:24:44,291 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_150002_2861830.trn 2018-07-20 15:24:44,292 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_163002_1264673.trn 2018-07-20 15:24:44,293 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_173002_9091918.trn 2018-07-20 15:24:44,293 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_183002_4907141.trn 2018-07-20 15:24:44,295 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_203001_9969594.trn 2018-07-20 15:24:44,298 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_213002_7640838.trn 2018-07-20 15:24:44,299 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_230003_6027699.trn 2018-07-20 15:24:44,299 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_13_233002_1299288.trn 2018-07-20 15:24:44,328 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_001502_3542715.bak 2018-07-20 15:24:44,330 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_080002_8472761.trn 2018-07-20 15:24:44,331 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_090002_4755985.trn 2018-07-20 15:24:44,334 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_093002_3131598.trn 2018-07-20 15:24:44,335 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_100002_1195210.trn 2018-07-20 15:24:44,336 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_110002_9022454.trn 2018-07-20 15:24:44,337 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_113002_7554067.trn 2018-07-20 15:24:44,339 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_130002_6112910.trn 2018-07-20 15:24:44,341 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_153002_8130990.trn 2018-07-20 15:24:44,343 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_173002_3505444.trn 2018-07-20 15:24:44,345 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_180002_0789054.trn 2018-07-20 15:24:44,347 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_183003_1644689.trn 2018-07-20 15:24:44,348 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_213002_2054364.trn 2018-07-20 15:24:44,349 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_220001_9961975.trn 2018-07-20 15:24:44,351 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_230002_7789220.trn 2018-07-20 15:24:44,353 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_14_233002_5852832.trn 2018-07-20 15:24:44,369 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_15_001501_7644240.bak 2018-07-20 15:24:44,372 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_15_080002_7722296.trn 2018-07-20 15:24:44,372 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_15_090002_3069518.trn 2018-07-20 15:24:44,378 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_15_110002_0315975.trn 2018-07-20 15:24:44,384 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_15_120002_7675218.trn 2018-07-20 15:24:44,391 - delete source file -E:\数据库维护\openmobster\openmobster_backup_2018_07_15_123002_7142833.trn 2018-0