How to escape a while loop in C

Question

I am trying to escape a while loop  Basically  if the  if  condition is met  I would like to be able to exit this loop   private void CheckLog         while  true                Thread Sleep 5000           if   System IO File Exists  Command bat                continue           using  System IO StreamReader sr   System IO File OpenText  Command bat                          string s                   while   s   sr ReadLine       null                                if  s Contains  mp4 production CATCHUP                                           RemoveEXELog                         Process p   new Process                        p StartInfo WorkingDirectory    dump                       p StartInfo FileName    test exe                       p StartInfo Arguments   s                      p Start                          lt  lt  Escape here - if the  if  condition is met  escape the loop here  gt  gt

User · Accepted Answer

Use break  to escape the first loop   if  s Contains  mp4 production CATCHUP          RemoveEXELog       Process p   new Process       p StartInfo WorkingDirectory    dump      p StartInfo FileName    test exe       p StartInfo Arguments   s      p Start       break      If you want to also escape the second loop  you might need to use a flag and check in the out loop s guard           boolean breakFlag   false          while   breakFlag                        Thread Sleep 5000               if   System IO File Exists  Command bat    continue              using  System IO StreamReader sr   System IO File OpenText  Command bat                                  string s                       while   s   sr ReadLine       null                                        if  s Contains  mp4 production CATCHUP                                                    RemoveEXELog                             Process p   new Process                            p StartInfo WorkingDirectory    dump                           p StartInfo FileName    test exe                            p StartInfo Arguments   s                           p Start                             breakFlag   true                          break                                                          Or  if you want to just exit the function completely from within the nested loop  put in a return  instead of a break     But these aren t really considered best practices  You should find some way to add the necessary Boolean logic into your while guards

User · Answer

If you need to continue with additional logic use     break    or if you have a value to return     return my value to be returned    However  looking at your code  I believe you will control the loop with the revised example below without using a break or return     private void CheckLog                         bool continueLoop   true              while  continueLoop                                Thread Sleep 5000                   if   System IO File Exists  Command bat    continue                  using  System IO StreamReader sr   System IO File OpenText  Command bat                                          string s                           while  continueLoop  amp  amp   s   sr ReadLine       null                                                if  s Contains  mp4 production CATCHUP                                                           RemoveEXELog                                 Process p   new Process                                p StartInfo WorkingDirectory    dump                               p StartInfo FileName    test exe                                p StartInfo Arguments   s                               p Start                                continueLoop   false

User · Answer

break  is a command that breaks out of the  closest  loop   While there are many good uses for break  you shouldn t use it if you don t have to -- it can be seen as just another way to use goto  which is considered bad   For example  why not   while    the condition you re using to break                        Your code here              If the reason you re using  break  is because you don t want to continue execution of that iteration of the loop  you may want to use the  continue  keyword  which immediately jumps to the next iteration of the loop  whether it be while or for    while   condition         Some code    if  condition  continue       More code that will be skipped over if the condition was true

User · Answer

Which loop are you trying to exit  A simple break  will exit the inner loop  For the outer loop  you could use an outer loop-scoped variable  e g  boolean exit   false   which is set to true just before you break your inner loop  After the inner loop block check the value of exit and if true use break  again

User · Answer

But you might also want to look into a very different approach  listening for file-system events

User · Answer

break or goto  while   true       if   conditional         break        if   other conditional         goto EndWhile        EndWhile

User · Answer

Sorry for the necro-add  but there s something I really wanted to insert that s missing in the existing answers  for anyone like me stumbling onto this question via google   refactor your code   Not only will it make it easier to read maintain  but it ll often remove these types of control-routing issues entirely   Here s what I d lean towards if I had to program the function above   private const string CatchupLineToIndicateLogDump    mp4 production CATCHUP    private const string BatchFileLocation    Command bat    private void CheckLog         while  true                Thread Sleep 5000           if  System IO File Exists BatchFileLocation                         if  doesFileContainStr BatchFileLocation  CatchupLineToIndicateLogDump                                 RemoveLogAndDump                    return                                   private bool doesFileContainStr string FileLoc  string StrToCheckFor             code for checking the existing of a string within a file       and returning back whether the string was found      private void RemoveLogAndDump              your code to call RemoveEXELog and kick off test exe

[c#] How to escape a while loop in C#

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