Solve the problem that the Changed event of the FileSystemWatcher class in C # is triggered multiple times.

Fsw = new FileSystemWatcher (System. Environment. CurrentDirectory + "\ conf \", "*. xml ");
Fsw. EnableRaisingEvents = true;
Fsw. policyfilter = policyfilters. LastWrite;
Fsw. Changed + = new FileSystemEventHandler (fsw_Changed );
First, set policyfilter to LastWrite, which shields the Changed event from being triggered due to various external factors such as anti-virus software.
Then set its EnableRaisingEvents attribute as follows:

C # code

In this way, set it to false first, and then set it to true after the file is processed.