A WPF Template solution using MVVM and Castle Windsor

<?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">

  <!-- 
  See http://nlog-project.org/wiki/Configuration_file 
  for information on customizing logging rules and outputs.
   -->

  <variable name="appTitle"     value="ST HMI"/>
  <variable name="logDirectory" value="${basedir}/Logs/"/>
  <variable name="logFilePath"  value="/${shortdate}.log"/>


  <targets>
    <!-- add your targets here -->
    <target xsi:type="File" name="default" fileName="${logDirectory}${appTitle}${logFilePath}"
            layout="${longdate} ${uppercase:${level}} ${message}${newline}(${stacktrace}) ${exception:format=ToString}" />
  </targets>

  <rules>
    <!-- add your logging rules here -->
    <logger name="*" minlevel="Trace" writeTo="default" />
  </rules>
</nlog>