NLog.config

<?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">

  <variable name="layout1" value="${longdate} || ${logger} || ${uppercase:${level}} || ${message}" />
  <variable name="layout2" value="${longdate} - ${uppercase:${level}} - ${message}" />
  <variable name="AppData_Low" value="${basedir}/App_Data/Nlog.Errors/${shortdate}.Low.log" />
  <variable name="AppData_High" value="${basedir}/App_Data/Nlog.Errors/${shortdate}.High.log" />
  <variable name="errorDetails" value="==============================${newline}發生時間: ${longdate}${newline}類別: ${logger}${newline}訊息: ${message}${newline}方法: ${stacktrace:format=DetailedFlat}${newline}例外堆疊: ${exception:format=ToString}${newline}==============================${newline}" />
  
  <!-- optional, add some variables
  https://github.com/nlog/NLog/wiki/Configuration-file#variables
  -->
  <variable name="myvar" value="myvalue"/>

  <!--
  See https://github.com/nlog/nlog/wiki/Configuration-file
  for information on customizing logging rules and outputs.
   -->
  <targets>

    <!--
    add your targets here
    See https://github.com/nlog/NLog/wiki/Targets for possible targets.
    See https://github.com/nlog/NLog/wiki/Layout-Renderers for the possible layout renderers.
    -->

    <!--
    Write events to a file with the date in the filename.
    <target xsi:type="File" name="f" fileName="${basedir}/logs/${shortdate}.log"
            layout="${longdate} ${uppercase:${level}} ${message}" />
    -->
    
    <target xsi:type="File" name="Low" fileName="${AppData_Low}" layout="${errorDetails}" />
    <target xsi:type="File" name="High" fileName="${AppData_High}" layout="${errorDetails}" />
  </targets>

  <rules>
    <!-- add your logging rules here -->

    <!--
    Write all events with minimal level of Debug (So Debug, Info, Warn, Error and Fatal, but not Trace)  to "f"
    <logger name="*" minlevel="Debug" writeTo="f" />
    -->
    <logger name="*" levels="Trace,Debug,Info" writeTo="Low" />
    <logger name="*" levels="Warn,Error,Fatal" writeTo="High" />
  </rules>
</nlog>