How to use an existing dal to log with a log4net appender using spring dependency injection

Question

I'm working on an application that uses Spring to instantiate concrete classes and use NHibernate as an ORM.

I'm trying to create an appender for log4net that use the already existing DAL (LogDao : ILogDao) but the class must be injected by spring in the appender implementation.

I don't want to write my query in the configuration file like I know I could. It defeats the purpose of having a DAL in my opinion.

I have the impression that it is log4net that instantiate the appender so the spring dependency injection is not working (I can be wrong but it seems so).

Do I really need to use a service locator or are there any alternatives?

In my attempt below (simplified) I use a BLL but the problem is the same DAO or BLL.

namespace Application.Support.Log4net
{
    public class DatabaseAppender : AppenderSkeleton
    {
        private readonly ILogService _logService;

        public DatabaseAppender(ILogService logService)
        {
            _logService = logService;
        }

        protected void Log(LoggingEvent loggingEvent)
        {
            Log message = ConvertToLogMessage(loggingEvent);

            _logService.SaveLog(message);

        }

        /// <summary>This is the main entry point for the Log4Net framework.</summary>
        /// <param name="loggingEvent">The event to append.</param>
        protected override void Append(LoggingEvent loggingEvent)
        {
            try
            {
                if (loggingEvent == null)
                {
                    throw new ArgumentNullException("loggingEvent_");
                }

                Log(loggingEvent);
            }
            catch (Exception ex)
            {
                ErrorHandler.Error("An error occured while posting the provided event; unable to proceed.", ex);
            }
        }
    }
}