Log4net in a web service

I basically have the same question as

log4net only works when XmlConfigurator.Configure() is called

However, I couldn't comment there as I don't have any reputation (just signed up).

Thanks for any helpful comments. If I do anything wrong here, please advise. Thank you very much. Bernd

Update: Thanks for constructive hints. I've have made some progress and therefore will explain in more detail: I use log4net within a (VS generated C# web service). I do get the debug information in the debug file, however within VS (2012) I do get the message for every logging call:

log4net:ERROR An exception ocurred while retreiving stack frame information. System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt. bei log4net.Core.StackFrameItem..ctor(StackFrame frame)

To the coding:

I configured it via an xml-File:

<?xml version="1.0" encoding="utf-8" ?>
<log4net>  
  <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
    <file value="Logs/debug.log" />
    <encoding value="utf-8" />
    <appendToFile value="true" />
    <maximumFileSize value="10MB" />
    <maxSizeRollBackups value="2" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level (%class#%method:%line):%message%newline" />
    </layout>
  </appender>
  <root>
    <level value="DEBUG" />    
    <appender-ref ref="RollingFile" />
  </root>
</log4net>

My web service looks like this:

public class ObjectInfo : IObjectInfo
{    
    private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);



    public void DoWork()        {
      Logging.LoggingUtil.InitializeLogging();
      log.Debug("Some message");
    }
}

Hope this is quite sufficient. The LoggingUtil- class basically looks like this:

private const String Log4NetConfigurationFilePath = "log4net-config.xml"; //real path looks somewhat different
public static void InitializeLogging()
{    
  XmlConfigurator.Configure(new FileInfo(Log4NetConfigurationFilePath));     
}

I wonder, if the problem is that the stack trace cannot be found out within Cassine as Microsoft doesn't allow this in order to protect their implementation of the web service?

As explained here, this error occurs when there is a dynamic method in the call chain.

There they claim to have this error fixed in versions > 1.12.2.