ASP.NET Core与NLog集成的完整步骤

"dependencies": {
 "NLog.Extensions.Logging": "1.0.0-*"
}

// using NLog.Extensions.Logging;

loggerFactory.AddNLog();
//needed for non-NETSTANDARD platforms: configure nlog.config in your project root
env.ConfigureNLog("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"
  autoReload="true"
  throwConfigExceptions="true"
  internalLogLevel="Warn"
  internalLogToTrace="true"
  internalLogFile="AppData/Logs/NLogInternal.log">

 <!-- 
 - 日志文件被放置于 AppData/Logs 文件夹中，文件名为 {日志类目}.log 或 {日志类目}.err
 - 日志按天存档，放置于 AppData/Logs/Archives/{日志类目} 文件夹中，文件名为 {日期}.log 或 {日期}.err
 -->
 <targets>
 <!-- 通过 System.Diagnostics.Trace 输出由 EF 6 产生的数据库日志可以在 VS 输出窗口看到 -->
 <target name="XXX.Entities.AppDbContext.DatabaseLog.Trace"
   xsi:type="Trace"
   layout="${message}"
   />
 <!-- 在控制台输出由 EF 6 产生的数据库日志 -->
 <target name="XXX.Entities.AppDbContext.DatabaseLog.Console"
   xsi:type="Console"
   layout="${message}"
   />
 <!-- 在日志文件输出由 EF 6 产生的数据库日志 -->
 <target name="XXX.Entities.AppDbContext.DatabaseLog.File"
   xsi:type="File"
   layout="${message}"
   encoding="utf-8"
   archiveNumbering="Date"
   archiveEvery="Day"
   archiveDateFormat="yyyy-MM-dd"
   archiveFileName="AppData/Logs/Archives/XXX.Entities.AppDbContext.Database/{#}.log"
   fileName="AppData/Logs/XXX.Entities.AppDbContext.Database.log" 
   />
 <!-- 常规的 Trace 输出，调试时可以在 VS 输出窗口看到 -->
 <target name="TRACE"
   xsi:type="Trace"
   layout="[${longdate}] ${pad:padding=-5:inner=${level:uppercase=true}} ${logger}: ${newline}${message}${onexception:inner=${newline}${exception:format=ToString}}${newline}" />
 <!-- 常规的控制台输出 -->
 <target name="CONSOLE" 
   xsi:type="Console"
   layout="[${longdate}] ${pad:padding=-5:inner=${level:uppercase=true}} ${logger}: ${newline}${message}${onexception:inner=${newline}${exception:format=ToString}}${newline}" />
 <!-- 常规的日志文件输出 -->
 <target name="LOG_FILE"
   xsi:type="File"
   layout="[${longdate}] ${pad:padding=-5:inner=${level:uppercase=true}} ${logger}: ${newline}${message}${onexception:inner=${newline}${exception:format=ToString}}${newline}"
   encoding="utf-8"
   archiveNumbering="Date"
   archiveEvery="Day"
   archiveDateFormat="yyyy-MM-dd"
   archiveFileName="AppData/Logs/Archives/${filesystem-normalize:inner=${logger}}/{#}.log"
   fileName="AppData/Logs/${filesystem-normalize:inner=${logger}}.log" />

 <!-- 约定以 err 为文件后缀的日志文件记录了程序输出的警告或者错误。 -->
 <target name="ERROR_LOG_FILE"
   xsi:type="File"
   layout="[${longdate}] ${pad:padding=-5:inner=${level:uppercase=true}} ${logger}: ${newline}${message}${onexception:inner=${newline}${exception:format=ToString}}${newline}"
   encoding="utf-8"
   archiveNumbering="Date"
   archiveEvery="Day"
   archiveDateFormat="yyyy-MM-dd"
   archiveFileName="AppData/Logs/Archives/${filesystem-normalize:inner=${logger}}/{#}.err"
   fileName="AppData/Logs/${filesystem-normalize:inner=${logger}}.err" />

 </targets>

 <rules>
  <!-- 记录所有日志级别不低于 Warn 的日志到日志文件 -->
  <logger name="*" minlevel="Warn" writeTo="ERROR_LOG_FILE" />
  <!-- 记录 EF 生成的 SQL 语句 -->
  <logger name="XXX.Entities.AppDbContext.DatabaseLog" minlevel="Debug" 
    writeTo="XXX.Entities.AppDbContext.DatabaseLog.Trace,XXX.Entities.AppDbContext.DatabaseLog.Console,XXX.Entities.AppDbContext.DatabaseLog.File" final="true" />
 <!-- 除非调试需要，把 .NET Core 程序集的 Debug 输出都屏蔽 -->
  <logger name="Microsoft.*" minLevel="Info" writeTo="CONSOLE,TRACE,LOG_FILE" final="true" />
  <!-- 除非调试需要，把系统的 Debug 输出都屏蔽 -->
  <logger name="System.*" minLevel="Info" writeTo="CONSOLE,TRACE,LOG_FILE" final="true" />
  <!-- 记录应用程序的 Debug 输出 -->
  <logger name="MyApplication.*" minlevel="Debug" writeTo="TRACE,CONSOLE,LOG_FILE" />
 </rules>
</nlog>

"publishOptions": {
 "include": [
 "wwwroot",
 "Views",
 "Areas/**/Views",
 "appsettings.json",
 "web.config",

 "nlog.config"
 ]
}