core 中使用 nlog

public void Configure(IApplicationBuilder app, IHostingEnvironment env,ILoggerFactory logFac)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            
            logFac.AddNLog();
            env.ConfigureNLog("Configs/Nlog.config"); //配置文件

        }

<?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"
      internalLogLevel="Warn"
      internalLogFile="internal-nlog.txt">
  <!--define various log targets-->
  <targets>
    <!--write logs to file-->
    <target xsi:type="File" name="allfile" fileName="logs/all-${shortdate}.log"
            layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />
    
    <target xsi:type="File" name="ownFile-web" fileName="logs/my-${shortdate}.log"
            layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />
    <target xsi:type="Null" name="blackhole" />
  </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>