How can I query the path to an NLog log file?

Question

I've configured a file target for NLog as follows:

<targets>
  <target name="asyncFile" xsi:type="AsyncWrapper">
    <target xsi:type="File" name="logfile" fileName="${basedir}/Logs/${shortdate}.log"
          layout="${longdate} ${uppercase:${level}} ${message}" />
  </target>    
</targets>

How can I query the actual filesystem path (fileName) of this File target via NLog's API?

Solution 1

I've just tried to get this information via the configuration api.

Sadly it looks like the configuration is evaluated by the actual target and is not resolved in the configuration.

As {basedir} refers to the appdomain base directory you could simply read this value on your own.

var basedirPath = AppDomain.CurrentDomain.BaseDirectory;

Solution 2

    private string GetLogFile()
    {
        var fileTarget = LogManager.Configuration.AllTargets.FirstOrDefault(t => t is FileTarget) as FileTarget;
        return fileTarget == null ? string.Empty : fileTarget.FileName.Render(new LogEventInfo { Level = LogLevel.Info });
    }

Comments

[Kevin Marshall]

Worked like a charm!