LoggerExtensions.cs

public static class LoggerExtensions
{
	public static void Trace(this Logger logger, Exception exception, LogMessageGenerator messageFunc)
	{
		if (logger.IsTraceEnabled)
		{
			if (messageFunc == null)
			{
				throw new ArgumentNullException("messageFunc");
			}
			
			logger.Trace(exception, messageFunc());
		}
	}
}