Bug easily ignored by recursion

Recursion is easy to ignore BUG
Write a delete all files in the specified folder , Recursively include files in sub file directories , But does not include the file specified in the exception （ Case sensitive ）.
Because I forgot to set the exception array parameter in the recursion , The result is always not the expected result in the operation , Cannot ignore file in exception , Wasted nearly... In the inconceivable 30 Minutes of time , In my confusion, I suddenly found that I forgot to set the exception parameter in recursion .