ASP.NET Core 添加NLog日志支持(VS2015update3&VS2017)

创建一个新的ASP.NET Core项目

添加项目依赖

• NLog.Web.AspNetCore

在项目目录下添加nlog.config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="Warn"
      internalLogFile="c:	empinternal-nlog.txt">

  <!-- 加载ASP.NET Core插件 -->
  <extensions>
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions>

  <!-- 输出目的地 -->
  <targets>
     <!-- 输出到文件,这个文件记录所有日志 -->
     <target xsi:type="File" name="allfile" fileName="c:	emp
log-all-${shortdate}.log"
                 layout="${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|${message} ${exception}" />

   <!-- 另外一个日志记录文件,户口也跳过Microsoft开头相关日志信息 -->
     <target xsi:type="File" name="ownFile-web" fileName="c:	emp
log-own-${shortdate}.log"
             layout="${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|  ${message} ${exception}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />

     <!-- write to the void aka just remove -->
    <target xsi:type="Null" name="blackhole" />
  </targets>

  <!-- 写入目的地的规则 -->
  <rules>
    <!--全部记录,包括Microsoft开头的相关日志信息-->
    <logger name="*" minlevel="Trace" writeTo="allfile" />

    <!--跳过Microsoft开头的相关日志信息-->
    <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
    <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
  </rules>
</nlog>

将nlog.config复制到bin文件夹

在startup.cs文件中添加(红字)

using NLog.Extensions.Logging;
using NLog.Web;

public Startup(IHostingEnvironment env)
{
    env.ConfigureNLog("nlog.config");
}

public void ConfigureServices(IServiceCollection Services)
{
    //call this in case you need aspnet-user-authtype/aspnet-user-identity
    services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{

    //add NLog to ASP.NET Core
    loggerFactory.AddNLog();

    //add NLog.Web
    app.AddNLogWeb();

   //note: remove the old loggerFactory, like loggerFactory.AddConsole and  loggerFactory.AddDebug

记录日志

public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }

        public IActionResult Index()
        {
            _logger.LogInformation("Index page says hello");
            return View();
        }

运行ASP.NET Core网站,会生成两个文件

nlog-own-2017-04-28.log和nlog-all-2017-04-28.log