FileSystemWatcher specific files with filename keywords filter

Question

I am using below code for watching files on local system using FileSystemWatcher class. What I would like to do is watch only those filename which I specify in keywords (could be a comma separated string or txt file). Please guide me in the right direction.

   FileSystemWatcher objWatcher = new FileSystemWatcher(); 
   objWatcher.Filter = "*.*"; 
   objWatcher.Changed += new FileSystemEventHandler(OnChanged); 

   private static void OnChanged(object source, FileSystemEventArgs e) 
   { 
     string strFileExt = getFileExt(e.FullPath); 
   } 

Thanks & Regards

Answer 1

While the FileSystemWatcher doesn't support that, you can get that functionality by filtering the filename after the event is raised. You wont be able to use a filter like "." but for example if you wanted all xml and txt files you could do {".xml", ".txt"}

FileSystemWatcher objWatcher = new FileSystemWatcher(); 
objWatcher.Changed += new FileSystemEventHandler(OnChanged); 

string[] filters = new string[] { "test", "blah", ".exe"}; //this needs to be a member of the class so it can be accessed from the Changed event

private static void OnChanged(object source, FileSystemEventArgs e) 
{ 
    if (filters.Any(e.FullPath).Contains))
    {     
        string strFileExt = getFileExt(e.FullPath); 
    }
}

This should give you a basic idea of how you might do it.