Logger without and derived logger with filter

[Andreas Tscharner]

Hello World,

I am trying to create a logger without and a derived logger with a filter.
Unfortunately this does not work. What I did:
 ILog mainLogger = LogManager.GetLogger("log4net-test");
 ILog classLogger = LogManager.GetLogger("log4net-test.MainClass");

 LogTestManager ltm = new LogTestManager();

 RollingFileAppender rotateAppender = ltm.CreateRollingFileAppender();
 rotateAppender.ActivateOptions();

((log4net.Repository.Hierarchy.Logger)mainLogger.Logger).AddAppender(rotateAppender);

 RollingFileAppender rfa = ltm.CreateRollingFileAppender();
 StringMatchFilter smf = ltm.CreateStringMatchFilter("TestMatch");
 rfa.AddFilter(smf);
 rfa.ActivateOptions();

((log4net.Repository.Hierarchy.Logger)classLogger.Logger).AddAppender(rfa);


((log4net.Repository.Hierarchy.Logger)mainLogger.Logger).Level = Level.All;
 ((Hierarchy)LogManager.GetRepository()).Configured = true;

 var firstClass = new MainClass(classLogger);

The first logger ("mainLogger") should log everything (that works), the 
second logger ("classLogger") should log everything (to the same file) 
except text that contains "TestMatch". Unfortunately if I execute:

 mainLogger.Error("An unfiltered TestMatch statement");
 firstClass.PrintLoggingStatement("A filtered TestMatch statement", 
Level.Error);

I got both in my log file. If I add the filter to the first 
logger/appender, both statements are filtered.

What I am doing wrong? How to fix this?

TIA and best regards
        Andreas
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Andreas Tscharner   a...@vis.ethz.ch   ICQ-No. 14356454