Configure Autofac to inject ILog parameters based on the type of the component being activated.

public class LogInjectionModule : Module
{
    protected override void AttachToComponentRegistration(IComponentRegistry registry, IComponentRegistration registration)
    {
        registration.Preparing += OnComponentPreparing;
    }

    static void OnComponentPreparing(object sender, PreparingEventArgs e)
    {
        var t = e.Component.Activator.LimitType;
        e.Parameters = e.Parameters.Union(new[]
        {
            new ResolvedParameter((p, i) => p.ParameterType == typeof(ILog), (p, i) => LogManager.GetLogger(t))
        });
    }
}

Note

This approach only works for constructor injection, which is the recommended strategy when using Autofac.

Contribution by Rich Tebb/Bailey Ling:

To that end, I hereby donate a revamped bit of code that instantiates an appropriate log4net ILog instance. The original was for Autofac v1, but this is a reworking for v2. I can't post on the original thread (http://groups.google.com/group/autofac/msg/704f926779cbe8b3) where it belongs, but credits to Bailey Ling for the original idea.