Question

I’m using log4net to log write log message to a rolling log file.

Now I would also redirect all trace messages from System.Diagnostics.Trace to that log file. How can I configure that? I tried to find anything about that in the log4net documentation, but without success. Is it possible at all?

The reason I want to do that is because I am interested in the Trace messages of a 3rd party library.

<log4net>     <appender name='R1' type='log4net.Appender.RollingFileAppender'>       <file value='C:\Logs\MyService.log' />       <appendToFile value='true' />       <rollingStyle value='Date' />       <maxSizeRollBackups value='10' />       <datePattern value='yyyyMMdd' />       <layout type='log4net.Layout.PatternLayout'>         <conversionPattern value='%date [%thread] %-5level %logger [%property{NDC}] - %message%newline' />       </layout>     </appender> </log4net> 

Answer 1

According to Rune’s suggestion I implemented a basic TraceListener which output to log4net:

public class Log4netTraceListener : System.Diagnostics.TraceListener {     private readonly log4net.ILog _log;      public Log4netTraceListener()     {         _log = log4net.LogManager.GetLogger('System.Diagnostics.Redirection');     }      public Log4netTraceListener(log4net.ILog log)     {         _log = log;     }      public override void Write(string message)     {         if (_log != null)         {             _log.Debug(message);         }     }      public override void WriteLine(string message)     {         if (_log != null)         {             _log.Debug(message);         }     } }