折騰了好幾次，自己網上找了很多關於log4net、Nlog的，試了很久，才弄好一個Nlog的，後續看下搞定log4net，再加上

呼叫程式碼

var logger =  NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
logger.Error("報錯資訊");

配置檔案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"
      internalLogLevel="info"
      internalLogFile="${basedir}\log\internal-nlog.log">

  <!-- enable asp.net core and mongodb layout renderers -->
  <extensions>
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions
 
>

  <!--internal-nlog:NLog啟動及載入config資訊-->
  <!--nlog-all:所有日誌記錄資訊-->
  <!--nlog-own:自定義日誌記錄資訊-->

  <!-- the targets to write to -->
  <targets>
    <!-- write logs to file  -->
    <target xsi:type="File" name="allfile" fileName="${basedir}\log\nlog-all-${shortdate}.log"
 

            layout="${longdate} >> [日誌級別：${uppercase:${level}}]${newline}日誌來源：${logger}${newline}日誌資訊：${message}${newline}錯誤資訊：${exception:format=tostring}${newline}==============================================================${newline}" />
      
      <target xsi:type="File" name="error" fileName="${basedir}\log\nlog-err-${shortdate}.log"
              layout="${longdate} >> [日誌級別：${uppercase:${level}}]${newline}日誌來源：${logger}${newline}日誌資訊：${message}${newline}錯誤資訊：${exception:format=tostring}${newline}==============================================================${newline}" />

      <target xsi:type="File" name="info" fileName="${basedir}\log\nlog-info-${shortdate}.log"
              layout="${longdate} >> [日誌級別：${uppercase:${level}}]${newline}日誌資訊：${message}${newline}" />

  </targets>

  <!-- rules to map from logger name to target -->
  <rules>
    <!--<logger name="*" minlevel="Trace" writeTo="allfile" />-->
      <logger name="*" level="Error" writeTo="error" />
      <logger name="*" level="Info" writeTo="info" />

    <!--Skip non-critical Microsoft logs and so log only own logs-->
    <logger name="Microsoft.*" maxLevel="Info" final="true" />
    <!-- BlackHole without writeTo -->
      <!-- <logger name="*" minlevel="Trace" writeTo="ownFile-web" /> -->
  </rules>
</nlog>