ASP.NET Core根据环境切换NLog配置

1、新建NLog配置文件，名称分别为nlog.config和nlog.debug.config

<?xml version="1.0"?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="Warn"
      internalLogFile="${basedir}\logs\internal-nlog.txt">

  <extensions>
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions>

  <targets>
    <target name="allfile" xsi:type="File"
            fileName="${basedir}\logs\GDStationaryNetCore\${shortdate}.log"
            encoding="utf-8"
            layout="[${longdate}][${machinename}][${level}] ${message} ${exception}" />
  </targets>
  <rules>
    <!--All logs,including from Microsoft-->
    <logger name="*" minlevel="Trace" writeto="allfile" />

    <!--Skip Microsoft logs and so log only own logs-->
    <logger name="Microsoft.*" minlevel="Trace" writeto="blackhole" final="true" />
    <logger name="*" minlevel="Trace" writeto="ownFile-web" />
  </rules>
</nlog>

另一份配置文件与上面一样，修改保存日志的目录为其他目录

2、在Startup里的Configure方法里配置，并根据环境配置NLog配置文件

            //根据环境变量切换NLog配置
            var environment = Environment.GetEnvironmentvariable("ASPNETCORE_ENVIRONMENT");
            var isProd = environment == EnvironmentName.Production;
            env.ConfigureNLog(isProd ? "nlog.config" : "nlog.debug.config");

可在工程的属性 调试里修改环境变量