azure-logging.cs

using System.Diagnostics;
    using log4net.Appender;
    using log4net.Core;

    public class AzureAppender : AppenderSkeleton
    {
        protected override void Append(LoggingEvent loggingEvent)
        {
            string logString = RenderLoggingEvent(loggingEvent);

            switch (loggingEvent.Level.Name)
            {
                case "ERROR":
                    Trace.TraceError(logString);
                    break;
                case "WARN":
                    Trace.TraceWarning(logString);
                    break;
                case "INFO":
                    Trace.TraceInformation(logString);
                    break;
                default:
                    Trace.Write(logString);
                    break;
            }
        }
    }