How can I include SessionID in log files using log4net in ASP.NET?

Question

I\'m new to log4net, so hopefully this is a really easy question for someone?!

I\'ve got log4net working with the RollingLogFileAppender for my web application. I\'

Answer 1

UPDATE (2014-06-12): Starting from log4net 1.2.11 you can use %aspnet-request{ASP.NET_SessionId} in conversion pattern for this purpose.

References: https://issues.apache.org/jira/browse/LOG4NET-87 http://logging.apache.org/log4net/release/sdk/log4net.Layout.PatternLayout.html

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You should create Application_PostAcquireRequestState handler in Global.asax.cs (it is called in every request):

protected void Application_PostAcquireRequestState(object sender, EventArgs e)
{
    log4net.ThreadContext.Properties["SessionID"] = Session.SessionID;
}

And add [%property{SessionID}] to conversionPattern.