Nlog Save log file based on variable

Question

I have dynamically created game instances that each create a GUID on initialization, I want each of these instances to log in their own logfile. However right now it only logs to the latest instance initialized

Game Instance:

public class GameInstance
{
    private static readonly Logger Logger = LogManager.GetCurrentClassLogger();

    public void Initialize()
    {
        var Guid = Guid.NewGuid();
        Logger.Factory.Configuration.Variables["GameGuid"] = Guid.ToString();
        Logger.Info("Game starting, GUID: " + Guid + ", with " + AllUsers.Count + " players.");    
    }

    public void HandleUserInput()
    {
        Logger.Info("Test Test");
    }
}

My Nlog Configuration:

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd"
      autoReload="true"
      throwExceptions="false"
      internalLogLevel="Off" internalLogFile="c:\temp\nlog-internal.log">

  <targets>
    <target name="logfile" xsi:type="File" fileName="logs/logfile.txt" />
    <target name="gamefile" xsi:type="File" fileName="logs/games/${var:GameGuid}.txt" />
  </targets>

  <rules>
    <logger name="Test.GameInstance" minlevel="Info" writeTo="gamefile" final="true"/>
    <logger name="*" minlevel="Info" writeTo="logfile" />
  </rules>
</nlog>

Answer 1

You should use LogEventInfo instance and set it's property value instead of setting logger factory configuration variable

var logEventInfo = new LogEventInfo(logLevel, loggerName, message);
logEventInfo.Properties["GameGuid"] = Guid.NewGuid().ToString();

logger.Log(logEventInfo);

Instead of ${var:GameGuid} use ${event-properties:item=GameGuid}