C#NLog上傳log到數據庫和本地文件

1.下載NLog和Nlog.config

 

2.配置NLog.asd

3.配置Nlog.config（本文爲SQL Server2017）

<?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="c:\temp\nlog-internal.log">

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

  <!--
  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}} ${message}" />
    -->
    <!-- write logs to file -->
    <target name="file" xsi:type="AsyncWrapper" queueLimit="5000" overflowAction="Discard">
      <target xsi:type="File" fileName="${basedir}/logs/${shortdate}.log" layout="${longdate} ${level:uppercase=true} ${event-context:item=Action} ${message} ${event-context:item=Amount} ${stacktrace}" />      
    </target>
    
        <!-- write log message to database -->
    <target name="db" xsi:type="Database" connectionString="Data Source=數據庫名稱;Initial Catalog=ydqcx;Persist Security Info=True;User ID=sa;Password=密碼" 
            commandText="insert into tLog ([CreateDate], [Origin], [LogLevel], [Message], [StackTrace]) values (@createDate, @origin, @logLevel, @message, @stackTrace)">
        
      <parameter name="@createDate" layout="${longdate}"/>
      <!--日誌發生時間-->
      <parameter name="@origin" layout="${callsite}"/>
      <!--日誌來源-->
      <parameter name="@logLevel" layout="${level}"/>
      <!--日誌等級-->
      <parameter name="@message" layout="${message}"/>
      <!--日誌信息-->
      <parameter name="@stackTrace" layout="${stacktrace}"/>
      <!--堆棧信息-->
    </target>  
  
</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" />
    -->
    <!--DEBUG,INFO,WARN,ERROR,FATAL-->
    <logger name="*" minlevel="Info" writeTo="file"/>
    <logger name="*" writeTo="db"/>
  </rules>
</nlog>

 4.建立數據庫表（當數據類型存儲數量小於正常所需存儲大小，數據庫存不上東西，所以設置爲varchar(Max)）

5.引用，輸出

using NLog;

/////////////命名空間下///////////////////////////////////////////////
        /// <summary>
        /// 獲取log
        /// </summary>
        private ILogger log = LogManager.GetCurrentClassLogger();
//////////某方法下////////////////////////////
        private void Login()
        {
            log.Info("用戶：" + user + "（登錄）");
            //log.Fatal("用戶：" + user + "（登錄）");
        }