NLog use

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="d:\nlog\nlog-internal.log">

  <!-- optional, add some variables
  https://github.com/nlog/NLog/wiki/Configuration-file#variables
  -->
  <!--<variable name="myvar" value="myvalue"/>-->

  <variable name="logDir" value="${basedir}/nlog"/>
  <variable name="logFileName" value="${date:format=yyyyMMdd}.txt"/>
  <variable name="logArchiveFileName" value="${date:format=yyyyMMdd}_{#}.txt"/>
  <variable name="logLayout" value="Logger：${logger}${newline}Date：${longdate}${newline}Level：${uppercase:${level}}${newline}Message：${message} ${newline}${onexception:Exception：${exception:format=toString}${newline}}" />
  <!--
  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="info"
            layout="${logLayout}"
            fileName="${logDir}/info/${logFileName}"
            archiveFileName="${logDir}/info/${logArchiveFileName}"
            archiveAboveSize="10485760"
            archiveNumbering="Sequence"
            maxArchiveFiles="100"
            concurrentWrites="true"
            keepFileOpen="true"
            openFileCacheTimeout="30"
            encoding="UTF-8" />

    <target xsi:type="File" name="debug"
            layout="${logLayout}"
            fileName="${logDir}/debug/${logFileName}"
            archiveFileName="${logDir}/debug/${logArchiveFileName}"
            archiveAboveSize="10485760"
            archiveNumbering="Sequence"
            maxArchiveFiles="100"
            concurrentWrites="true"
            keepFileOpen="true"
            openFileCacheTimeout="30"
            encoding="UTF-8" />

    <target xsi:type="File" name="error"
            layout="${logLayout}"
            fileName="${logDir}/error/${logFileName}"
            archiveFileName="${logDir}/error/${logArchiveFileName}"
            archiveAboveSize="10485760"
            archiveNumbering="Sequence"
            maxArchiveFiles="100"
            concurrentWrites="true"
            keepFileOpen="true"
            openFileCacheTimeout="30"
            encoding="UTF-8" />

  </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="*" minlevel="Info" maxlevel="Info" writeTo="info" />

    <logger name="*" minlevel="Debug" maxlevel="Debug" writeTo="debug" />

    <logger name="*" minlevel="Error" maxlevel="Error" writeTo="error" />

  </rules>
</nlog>

Don't forget it

  Test code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using NLog;

namespace NlogTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private Logger _log = NLog.LogManager.GetCurrentClassLogger();

        private void button1_Click(object sender, EventArgs e)
        {

            _log.Info(" Information ");

            _log.Error(" abnormal ");

            int a = 0;
            int b = 0;
            try
            {
                int c = a / b;
            }
            catch (Exception ex)
            {
                _log.Error(ex," Abnormal operation ");
            }

        }
    }
}

effect

Demo download https://download.csdn.net/download/lw112190/85812952