#author("2017-11-27T14:49:07+00:00","default:admin","admin")
*NLog [#z3238bda]
-[[Getting started with ASP.NET Core (csproj vs2017):https://github.com/NLog/NLog.Web/wiki/Getting-started-with-ASP.NET-Core-(csproj---vs2017)]]
--[[Getting started with ASP.NET Core 2:https://github.com/NLog/NLog.Web/wiki/Getting-started-with-ASP.NET-Core-2]]

-[[ASP.NET Core Logging Tutorial – What Still Works and What Changed?:https://stackify.com/asp-net-core-logging-what-changed/]]

**セットアップ [#a8c75994]
-NuGet で [[NLog.Web.AspNetCore:https://www.nuget.org/packages/NLog.Web.AspNetCore]] をインストール
-プロジェクト直下に「nlog.config」を作成
 <?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:\temp\internal-nlog.txt">
 
   <!-- Load the ASP.NET Core plugin -->
   <extensions>
     <add assembly="NLog.Web.AspNetCore"/>
   </extensions>
 
   <!-- the targets to write to -->
   <targets>
      <!-- write logs to file -->
      <target xsi:type="File" name="allfile" fileName="c:\var\log\nlog-all-${shortdate}.log"
                  layout="${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|${message} ${exception}" />
 
    <!-- another file log, only own logs. Uses some ASP.NET core renderers -->
      <target xsi:type="File" name="ownFile-web" fileName="c:\var\log\nlog-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>
 
   <!-- rules to map from logger name to target -->
   <rules>
     <!--All logs, including from Microsoft-->
     <logger name="*" minlevel="Trace" 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" />
   </rules>
 </nlog>

-nlog.config のプロパティを開き、直接出力を「常に出力」にする
-Startup.cs を変更
 public Startup(IConfiguration configuration, IHostingEnvironment env)
 {
         Configuration = configuration;
         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();
-ログ出力
 public class HomeController : Controller
 {
         private readonly ILogger<HomeController> _logger;
 
         public HomeController(ILogger<HomeController> logger)
         {
                 _logger = logger;
         }
 
         public IActionResult Index()
         {
                 _logger.Fatal("致命的レベル");
                 _logger.Error("エラーレベル");
                 _logger.Warn("警告レベル");
                 _logger.Info("情報レベル");
                 _logger.Debug("デバッグレベル");
                 _logger.Trace("トレースレベル");
                 
                 return View();
         }
-ログ確認
 > Get-Content C:\var\log\nlog-own-2017-11-27.log -wait -tail 10 -Encoding UTF8

*[[Serilog:https://serilog.net]] [#q943c57e]
-[[ASP.NET Core～SerilogからSeqでロギングしてslackに通知する:http://ryuichi111std.hatenablog.com/entry/2016/07/20/111015]]
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