c# - Raised exception in the case of concurrent file access with StreamReader -

i found post talking handling concurrent file access streamwriter.

the problem answers not manage scenario file being accessed multiple processes.

let's tell shortly :

• i have multiple applications
• i need centralised logging system in database
• if database fail, need fallback on file system log

there known concurrency scenario, multiple applications (processes) try write in file. can managed re-attempt writing after short delay. don't want ot reattempt if it's security error or filename syntax error.

the code here :

// true if access error occured bool accesserror = false; // number fo writing attemps int attempts = 0;  {     try     {         // open file         using (streamwriter file = new streamwriter(filename, true))         {             // write line             file.writeline(log);             // success             result = true;         }     }         /////////////// access errors ///////////////     catch (argumentexception)     {         accesserror = true;     }     catch (directorynotfoundexception)     {         accesserror = true;     }     catch (pathtoolongexception)     {         accesserror = true;     }     catch (securityexception)     {         accesserror = true;     }         /////////////// concurrent writing errors ///////////////     catch (exception)     {         // exception should catch here ?         // sleep before retrying         thread.sleep(concurrentwritedelay);     }         {         attempts++;     }     // while number of attemps has not been reached } while ((attempts < concurrentwriteattempts)             // while have no access error             && !accesserror             // while log not written             && !result); 

my question the type of exception raised in case of concurrency writting. know things can done differently. let me add few considerations :

• no, don't want use nlog in scenario
• yes handle concurrency ioc + mutex in-process concurrency
• yes want log written in same file

it ioexception text:

"the process cannot access file '{0}' because being used process."

this simplistic approach:

 static bool logerror(string filename, string log)     {         const int max_retry = 10;         const int delay_ms = 1000; // 1 second         bool result = false;         int retry = 0;         bool keepretry = true;         while (keepretry && !result && retry < max_retry )         {             try             {                 using (streamwriter file = new streamwriter(filename, true))                 {                     // write line                     file.writeline(log);                     // success                     result = true;                 }             }             catch (ioexception ioexception)             {                 thread.sleep(delay_ms);                 retry++;              }             catch (exception e)             {                  keepretry = false;             }          }         return result;     }