By default; File Target, CSV Target, XML File Target, and the HTML File Target all roll by discarding MaxEntries.  After it reaches a default of 10,000 log messages, older messages will be discarded.  Other options are available.

• RollingStyle.NoRolling - No file log rolling is performed.
• RollingStyle.ArchiveMaxLogEntries - After MaxLogEntries is reached, the log file is archived.
• RollingStyle.ArchiveSize - After the FileRollingMaxSize is reached, the log file is archived.
• RollingStyle.ArchiveTimePeriod - For each FileRollingTimePeriod, the log file is archived.
• RollingStyle.DiscardMaxLogEntries - After MaxLogEntries is reached, old entries are discarded.

 

When archiving by the time period, these are the options:

• RollingTimePeriod.Minute
• RollingTimePeriod.Hourly
• RollingTimePeriod.Daily
• RollingTimePeriod.Weekly
• RollingTimePeriod.Monthly
• RollingTimePeriod.Quarterly
• RollingTimePeriod.Yearly

 

//Example ArchiveMaxLogEntries
//Example runtime configuration, can also use log.config, app.config, or web.config
Log.ResetConfiguration();  
FileTarget target = new FileTarget("log.txt");   
target.FileRollingStyle = RollingStyle.ArchiveMaxLogEntries;
target.MaxLogEntries = 10000;
Log.Config.Targets.Add(target);
Log.Debug("This is a test");

 

//Example ArchiveSize
//Example runtime configuration, can also use log.config, app.config, or web.config
Log.ResetConfiguration();  
FileTarget target = new FileTarget("log.txt");   
target.FileRollingStyle = RollingStyle.ArchiveSize;
target.FileRollingMaxSize = 1000000;
Log.Config.Targets.Add(target);
Log.Debug("This is a test");

 

//Example ArchiveTimePeriod Daily
//Example runtime configuration, can also use log.config, app.config, or web.config
Log.ResetConfiguration();  
FileTarget target = new FileTarget("log.txt");   
target.FileRollingStyle = RollingStyle.ArchiveTimePeriod;
target.FileRollingTimePeriod = RollingTimePeriod.Daily;
Log.Config.Targets.Add(target);
Log.Debug("This is a test");