NLog記錄日誌到數據庫

1.安裝Nlog

2.修改配置文件

<?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"
      throwExceptions="true"
      internalLogLevel="Off">
  <variable name="myvar" value="myvalue"/>
  <targets>
    <!--<target xsi:type="Null" name="blackhole" />-->
    <!-- write logs to file -->
    <target xsi:type="File" name="allfile" fileName="logs/${date:format=yyyyMM}/nlog-all-${shortdate}.log"
             layout="${longdate}|${event-properties:item=EventId.Id}|${uppercase:${level}}|${logger} ${newline}${message} ${exception} ${newline}" />

    <target xsi:type="File" name="ownFile-web" fileName="logs/${date:format=yyyyMM}/nlog-own-${shortdate}.log"
             layout="${longdate}|${event-properties:item=EventId.Id}|${uppercase:${level}}|${logger} ${newline}${message} ${exception} ${newline} --- |url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />

    <target xsi:type="Null" name="blackhole" />
    <target xsi:type="Database" name="database" dbProvider="MySql.Data.MySqlClient.MySqlConnection,Mysql.Data">
        <connectionString>${var:connectionString}</connectionString>
      <commandText>
        insert into sys_log (
        Guid,Application, Logged, Level, Message,
        Logger, CallSite, Exception,IP,User,UserName,Browser
        ) values (
        @guid,@Application, @Logged, @Level, @Message,
        @Logger, @Callsite, @Exception, @IP,@User,@UserName,@Browser
        );
      </commandText>
      <parameter name="@guid" layout="${guid}" />
      <parameter name="@Application" layout="FytSoa" />
      <parameter name="@logged" layout="${date}" />
      <parameter name="@level" layout="${level}" />
      <parameter name="@message" layout="${message}" />
      <parameter name="@logger" layout="${event-context:item=Logger}" />
      <parameter name="@callSite" layout="${aspnet-Request-Url}" />
      <parameter name="@exception" layout="${exception:tostring}" />
      <parameter name="@IP" layout="${aspnet-request-ip}" />
      <parameter name="@User" layout="${aspnet-user-identity}" />
      <parameter name="@UserName" layout="${event-context:item=UserName}" />
      <parameter name="@Browser" layout="${aspnet-request-useragent}" />
    </target>

  </targets>

  <rules>
    <logger name="*" minlevel="Error" writeTo="allfile" />
    <!--Skip Microsoft logs and so log only own logs-->
    <!-- add your logging rules here -->
    <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
    <!--這裏全部使用最高等級Trace，即可以記錄所有類型日誌。可以根據需要降低等級，如使用Info，則僅記錄Info及以上的日誌，Trace、Debug日誌不記錄-->
    <logger name="*" minlevel="Trace" writeTo="database" />
    <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
  </rules>
</nlog>

3.Program中添加UseNlog()

public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseNLog()
                .Build();

4.Startup.cs中的Configure中設置數據庫連接

            #region Nlog記日誌
            //將日誌記錄到數據庫
            NLog.LogManager.LoadConfiguration("nlog.config").GetCurrentClassLogger();
            NLog.LogManager.Configuration.Variables["connectionString"] = Configuration["DBConnection:MySqlConnectionString"];
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);  //避免日誌中的中文輸出亂碼
            #endregion