.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:\temp\internal-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:\temp\nlog-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:\temp\nlog-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 = , firstname = "fan", lastname = "qi", uname = "fanqisoft", pwd = "admin", enabled =
             };
             _logger.LogInformation("Dto转换实体对象成功！");
             Users users = _mapper.Map<Users>(input);
             return View();
         }
     }
 }