asp.net core 2.1 增加Nlog日志到sql server数据库

一、增加引用

<PackageReference Include="NLog.Extensions.Logging" Version="1.2.1" />
<PackageReference Include="NLog.Web.AspNetCore" Version="4.6.0" />

二、配置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="Warn"
      internalLogFile="Logs/internal-nlog.txt">

  <!-- define various log targets -->
  <targets>
    <!-- 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">
      <connectionString>${var:connectionString}</connectionString>
      <commandText>
        insert into syslog (levels,operatingtime,operatingaddress,userid,logger,requesturl,referrerurl,action,message,exception)
        values (@levels,@operatingtime,@operatingaddress,@userid,@logger,@requesturl,@referrerurl,@action,@message,@exception);
      </commandText>
      <parameter name="@levels" layout="${level}" />
      <parameter name="@operatingTime" layout="${date}" />
      <parameter name="@operatingaddress" layout="${aspnet-Request-IP}" />
      <parameter name="@userid" layout="1" />
      <parameter name="@logger" layout="${logger}" />
      <parameter name="@requesturl" layout="${aspnet-request-url}" />
      <parameter name="@referrerurl" layout="${aspnet-request}" />
      <parameter name="@action" layout="${aspnet-mvc-action}" />
      <parameter name="@message" layout="${message}" />
      <parameter name="@exception" layout="${exception:tostring}" />
    </target>
  </targets>

  <rules>
    <!--All logs, including from Microsoft-->
    <!--minlevel 改为Trace 跟踪全部 Error 只捕获异常-->
    <logger name="*" minlevel="Error" 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" />
    <logger name="*" minlevel="Trace" writeTo="database" />
  </rules>
</nlog>

三、在代码中加入Nlog

1、program.cs 中

  public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseNLog(); //加入nlog日志

2、Startup.cs 中

  public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            //增加日志记录
            //loggerFactory.AddNLog(); 这个已在program 中加过了，在这里写的话是无法获取 请求地址等信息的
            //env.ConfigureNLog("nlog.config");

            NLog.LogManager.LoadConfiguration("config/nlog.config").GetCurrentClassLogger();
            NLog.LogManager.Configuration.Variables["connectionString"] = Configuration.GetConnectionString("DefaultConnection");

3、要写入日志的 Controller 中

    public class AccountController : Controller
    {
        private readonly ILogger<AccountController> _logger;
        private ApplicationConfiguration _config;
        private readonly SysUserService _service;

        public AccountController(SysUserService service, IOptions<ApplicationConfiguration> option, ILogger<AccountController> logger)
        {
            _logger = logger;
            _service = service;
　　　　　}

在需要写的位置：

  _logger.LogInformation("{userName} 登录系统。登录地址：{ip}", model.Account, "192.168.1.1");

完成。