c# - BackgroundWorker and CPU usage issues? -

i want iterate through files in computer , save filenames text file. in order avoid ui blocking, i'm using inside background worker. code below works fine. however, cpu usage high. sometime it's above 60%

  private void filelistmanagementworker_dowork(object sender, doworkeventargs e) {             driveinfo[] alldrives = driveinfo.getdrives();     list<string> directorylist = new list<string>();      foreach (driveinfo d in alldrives)     {         if (d.isready)         {             applyallfiles(d.name, processfile);         }     }      // iterate on personal folders     foreach (environment.specialfolder s in  enum.getvalues(typeof(environment.specialfolder)))     {         string pth = environment.getfolderpath(s);         applyallfiles(pth, processfile);     } }  private void applyallfiles(string folder, action<string> fileaction) {     try     {         foreach (string file in directory.getfiles(folder))         {             fileaction(file);         }         foreach (string subdir in directory.getdirectories(folder))         {             try             {                 applyallfiles(subdir, fileaction);             }             catch             {                 // swallow, log, whatever             }         }     }     catch (exception e) {  } }  private void processfile(string path) {         //messagebox.show("1");     // logic            path = path.replace(":","");     path = path.replace("\\", "/");     // messagebox.show(path.replace("\\", "/"));     if (!path.contains("recycle"))     {         try         {                           file.appendalltext("allfileslist.txt", path + "@!@");         }         catch (exception ed) {          //    messagebox.show(ed.message);          }     } } 

question : how reduce cpu usage. it's above 60%

there's nothing wrong background process using 100% of cpu, long doesn't block else needs it.

for example in windows, when process using 100% cpu , press ctrl+alt+delete, should take priority. if shows lock screen (almost) there's no problem.

if doesn't until process has finished have big problem , that's when need investigate. otherwise don't worry it!