How to configure the ILoggerFactory in log4net correctly?

Question

Background

I wanted some properties to be available in the logging events for certain loggers. After doing some research on the subject I came up with the following possible solutions:

• Writing my own wrappers and using them instead of log4net.ILog and log4net.LogManager.
• Subclassing log4net.Appenders.ForwardingAppender.
• Implement an log4net.Hierarchy.ILoggerFactory and create loggers that I derive from log4net.Hierarchy.Logger that add the properties I want.

The ILoggerFactory solution seemed like the easiest to implement and and gives me exactly what I want, nothing more, nothing less.

Question

How do I specify which ILoggerFactory log4net should use in the correct way? I'm currently doing this during the startup of my application:

XmlConfigurator.Configure();
Hierarchy hierarchy = (Hierarchy)LogManager.GetRepository();
hierarchy.LoggerFactory = new LoggerFactory();

It works for now but I do not fully understand every tiny bit of the log4net design so I do not know if it will blow up on me. Is it even supported writing a custom ILoggerFactory?