.Net Core 中使用NLog作为日志中间件

⒈安装相关依赖

　　NLog

　　NLog.Web.AspNetCore

⒉在项目的根目录中创建NLog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="Info"
      internalLogFile="c:	empinternal-nlog.txt">

  <!-- 启用asp.net核心布局渲染器- -->
  <extensions>
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions>

  <!-- 要写入的目标 -->
  <targets>
    <!-- 将日志写入到文件中  -->
    <target xsi:type="File" name="allfile" fileName="c:	emp
log-all-${shortdate}.log"
            layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />

    <!-- 另一个文件日志，只有自己的日志。使用一些ASP.NET核心渲染器 -->
    <target xsi:type="File" name="ownFile-web" fileName="c:	emp
log-own-${shortdate}.log"
            layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />
  </targets>

  <!-- 从记录器名称映射到目标的规则 -->
  <rules>
    <!--所有日志，包括来自Microsoft的日志-->
    <logger name="*" minlevel="Trace" writeTo="allfile" />

    <!--跳过非关键的Microsoft日志，因此只记录自己的日志-->
    <logger name="Microsoft.*" maxlevel="Info" final="true" />
    <!-- BlackHole without writeTo -->
    <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
  </rules>
</nlog>

⒊更改配置文件属性

⒋修改Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using NLog.Web;

namespace AutoMapperCore
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var logger = NLog.Web.NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
            try
            {
                logger.Debug("init main");
                CreateWebHostBuilder(args).Build().Run();
            }
            catch (Exception e)
            {
                logger.Error(e, "Stopped program because of exception");
                throw;
            }
            finally
            {
                NLog.LogManager.Shutdown();
            }
            
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
            .ConfigureLogging(logging =>
            {
                logging.ClearProviders();
                logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);

            }).UseNLog();
    }
}

⒌配置appsettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Trace",
      "Microsoft": "Information"
    }
  },
  "AllowedHosts": "*"
}

⒍在代码中注入ILogger写日志

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using AutoMapper;
using AutoMapperTest.Entities;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace AutoMapperCore.Controllers
{
    public class UsersController : Controller
    {
        private readonly IMapper _mapper;
        private readonly ILogger<UsersController> _logger;
        public UsersController(IMapper mapper, ILogger<UsersController> logger)
        {
            this._mapper = mapper;
            this._logger = logger;
        }
        public IActionResult Index()
        {
            UsersInputDto input = new UsersInputDto()
            {
                id = 1, firstname = "fan", lastname = "qi", uname = "fanqisoft", pwd = "admin", enabled = 1
            };
            _logger.LogInformation("Dto转换实体对象成功！");
            Users users = _mapper.Map<Users>(input);
            return View();
        }
    }
}