Log4net rolling daily filename with date in the file name

Question

I would like to have files named for example   dd mm yyyy log  How is this possible with log4net

User · Answer

I ve tried all the answers  but there was always something missing and not functioning as expected for me   Then I experimented a bit with the hints given in each answer and was successful with the following setting    lt appender name  RollingActivityLog  type  log4net Appender RollingFileAppender  gt     lt file type  log4net Util PatternString  value  C  temp LOG4NET Sample Activity log    gt     lt appendToFile value  true    gt     lt rollingStyle value  Date    gt     lt staticLogFileName value  false    gt     lt preserveLogFileNameExtension value  true    gt     lt datePattern value  -yyyyMMdd    gt     lt layout type  log4net Layout PatternLayout  gt       lt conversionPattern value   date  -5level -  message newline    gt     lt  layout gt   lt  appender gt    The issue with other combinations of parameters was that the latest file didn t have the time pattern  or that the time pattern was appended as  log20171215 which created a new file time  and a new file type   each day - or both issues appeared   Now with this setting you are getting files like this one   LOG4NET Sample Activity-20171215 log  which is what I wanted      To summarize    Don t put the date pattern in the  lt file value     attribute  just define it in the datePattern  Make sure you have the preserveLogFileNameExtension value attribute set to true  Make sure you have the staticLogFileName value set to false  Set the rollingStyle attribute value to Date

User · Answer

The extended configuration section in a previous response with               lt rollingStyle value  Composite    gt              listed works but I did not have to use    lt staticLogFileName value  false    gt        I think the RollingAppender must  logically  ignore that setting since by definition the file gets rebuilt each day when the application restarts reused   Perhaps it does matter for immediate rollover EVERY time the application starts

User · Answer

To preserve file extension    lt log4net gt       lt root gt         lt level value  DEBUG   gt         lt appender-ref ref  RollingLogFileAppender   gt       lt  root gt       lt appender name  RollingLogFileAppender  type  log4net Appender RollingFileAppender  gt         lt file type  log4net Util PatternString  value  D   LogFolder   date yyyyMM   SchT log    gt         lt appendToFile value  true    gt         lt rollingStyle value  Date    gt         lt maximumFileSize value  30MB    gt         lt staticLogFileName value  true    gt         lt preserveLogFileNameExtension value  true   gt         lt datePattern value  ddMMyyyy    gt         lt layout type  log4net Layout PatternLayout  gt           lt conversionPattern value   date   thread   -5level  logger -  message newline    gt         lt  layout gt       lt  appender gt     lt  log4net gt

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I moved configuration to code to enable easy modification from CI using system variable  I used this code for file name and result is  Log 03-23-2020 log               log4net Repository ILoggerRepository repository   LogManager GetRepository Assembly GetEntryAssembly                 Hierarchy hierarchy    Hierarchy repository              PatternLayout patternLayout   new PatternLayout                patternLayout ConversionPattern     date  level -  message newline exception               patternLayout ActivateOptions                 RollingFileAppender roller   new RollingFileAppender                roller AppendToFile   true              roller File    Log                roller DatePattern    MM-dd-yyyy  log                roller Layout   patternLayout              roller MaxFileSize   1024 1024 10              roller MaxSizeRollBackups   10              roller StaticLogFileName   false              roller RollingStyle   RollingFileAppender RollingMode Composite              roller ActivateOptions                hierarchy Root AddAppender roller

User · Answer

Using Log4Net 1 2 13 we use the following configuration settings to allow date time in the file name    lt file type  log4net Util PatternString  value  E  logname- utcdate yyyy-MM-dd  txt    gt   Which will provide files in the following convention  logname-2015-04-17 txt  With this it s usually best to have the following to ensure you re holding 1 log per day    lt rollingStyle value  Date    gt   lt datePattern value  yyyyMMdd    gt    If size of file is a concern the following allows 500 files of 5MB in size until a new day spawns  CountDirection allows Ascending or Descending numbering of files which are no longer current     lt maxSizeRollBackups value  500    gt    lt maximumFileSize value  5MB    gt    lt rollingStyle value  Composite    gt    lt datePattern value  yyyyMMdd    gt    lt CountDirection value  1   gt    lt staticLogFileName value  true    gt

User · Answer

lt appender name  RollingLogFileAppender  type  log4net Appender RollingFileAppender  gt     lt lockingModel type  log4net Appender FileAppender MinimalLock   gt     lt file value  logs     gt     lt datePattern value  dd MM yyyy  log     gt     lt staticLogFileName value  false    gt     lt appendToFile value  true    gt     lt rollingStyle value  Composite    gt     lt maxSizeRollBackups value  10    gt     lt maximumFileSize value  5MB    gt     lt layout type  log4net Layout PatternLayout  gt       lt conversionPattern value   date   thread   -5level  logger   property NDC   -  message newline    gt     lt  layout gt   lt  appender gt

User · Answer

For a RollingLogFileAppender you also need these elements and values    lt rollingStyle value  Date    gt   lt staticLogFileName value  false    gt

User · Answer

In your Log4net config file  use the following parameter with the RollingFileAppender    lt param name  DatePattern  value  dd MM yyyy  log     gt

User · Answer

I ended up using  note the   log  filename and the single quotes around  myfilename         lt rollingStyle value  Date    gt     lt datePattern value   myfilename  yyyy-MM-dd   gt     lt preserveLogFileNameExtension value  true    gt     lt staticLogFileName value  false    gt     lt file type  log4net Util PatternString  value  c   Logs   log    gt    This gives me   myfilename 2015-09-22 log myfilename 2015-09-23 log

[c#] Log4net rolling daily filename with date in the file name

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