Serilog log4net sink problem

gistfile1.txt

1. Create console app.
2. Install log4net, Serilog and Serilog.Sinks.log4net NuGet packages.
3. Add log4net.config:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
  </configSections>

  <log4net debug="false">

    <appender name="XmlRollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <file type="log4net.Util.PatternString" value="%property{LogRoot}/DsItsLog" />
      <appendToFile value="true" />
      <datePattern value=".yyyy-MM-dd'.xml'" />
      <rollingStyle value="Date" />
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.XmlLayoutSchemaLog4j">
        <locationInfo value="true"/>
      </layout>
    </appender>

    <root>
      <level value="ALL" />
      <appender-ref ref="XmlRollingFileAppender" />
    </root>
  </log4net>

</configuration>

4. Change the Program.cs as follows:

    class Program
    {
        static void Main(string[] args)
        {
            var log4netLogger = RegisterLog4Net();
            log4netLogger.Debug("This is a log4net message");

            var serilogLogger = RegisterSerilog();
            serilogLogger.Debug("This is a Serilog message with log4net sink");
        }

        private static ILog RegisterLog4Net()
        {
            GlobalContext.Properties["LogRoot"] = @"./logs";
            var log4netConfigFile = AppDomain.CurrentDomain.BaseDirectory + @"\log4net.config";
            log4net.Config.XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo(log4netConfigFile));

            var logger = LogManager.GetLogger(Assembly.GetExecutingAssembly().GetName().Name);
            return logger;
        }

        private static ILogger RegisterSerilog()
        {
            var logger = new LoggerConfiguration()
                .WriteTo.ColoredConsole()
                .WriteTo.Log4Net()
                .CreateLogger();

            Serilog.Debugging.SelfLog.Out = Console.Error;
            return logger;
        }
    }

5. Compile and run the program. There will be a log message from log4netLogger, but no messages from serilogLogger.