C# – Change log4net logging level programmatically


This is similar to 650694 but no answer was accepted there, I can't get any of those suggestions to work at all, and I suspect I may be in a slightly different situation.

I'm calling log4net.Config.XmlConfigurator.Configure(). But after that point in the program, I want to change the logging threshold to a value only known at runtime.

From the other question, I tried:

((log4net.Repository.Hierarchy.Logger)mylogger.Logger).Level = log4net.Core.Level.Error;


var appender = new log4net.Appender.ColoredConsoleAppender();
appender.Layout = new log4net.Layout.PatternLayout(@"%date %-5level %message%newline");
appender.Threshold = log4net.Core.Level.Error;

but neither one seems to have any effect: I'm still seeing DEBUG and INFO logging statements on the console.

My hunch is that I'm adding a new appender, which has no effect on the appender declared in the XML config (which tells it to print DEBUG level messages), but I don't have any evidence for this yet.

I've been digging through the log4net API for a while now, and I'm just not seeing it. Is there something simple I'm missing?

Best Answer

None of these solutions present here worked for me. It wasn't changing at runtime

Here is what worked for me:

((log4net.Repository.Hierarchy.Hierarchy)LogManager.GetRepository()).Root.Level = Level.Debug;

You have to call RaiseConfigurationChanged after making changes to its config.