Log4net :- Enrich log events with Additional data.

Three types of logging context available in Log4Net.

1. Log4Net.GlobalContext :- This context shared across all application threads and domains.If two threads set the same property on GlobalContext, One Value will override the other.
2. Log4Net.ThreadContext :- This context scope limited to calling thread. Here two threads can set same property to different values without overriding to each other.
3. Log4Net.ThreadLogicalContext :- This context behaves similarly to the ThreadContext. if you're working with a custom thread pool algorithm or hosting the CLR, you may find some use for this one.

Open Visual Studio, create a new console project, and add a reference to the log4net assembly.  Add the following code to your program.cs file:

namespace Log4Net_Context

{

    class Program

    {

        private static log4net.ILog Log = log4net.LogManager.GetLogger(
System.Reflection.MethodBase.GetCurrentMethod().DeclaringType );

        static void Main( string[] args )

        {

            log4net.Config.XmlConfigurator.Configure();

            log4net.ThreadContext.Properties[ "myContext" ] = "Logging from Main";

            Log.Info( "this is an info message" );

            Console.ReadLine();

        }

    }

}




Add the parameter definition for the custom column:

<configuration>

  <configSections>

    <section name="log4net"
      type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>

  </configSections>



  <log4net>  

    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">

      <layout type="log4net.Layout.PatternLayout">

        <conversionPattern value="%logger (%property{myContext})
[%level]- %message%newline" />

      </layout>

    </appender>

    <root>

      <level value="ALL" />

      <appender-ref ref="ConsoleAppender" />

    </root>

  </log4net>

</configuration>

Run your application and check the log file, you we find the addition data property.