.net Core 配置 Nlog

.net Core 配置 Nlog

1. 在nuget 包当中添加 Nlog.Web.AspNetCore 包（在控制器层）

2. 在控制器层创建一个nlog.config 文件

3. 将以下代码复制到nlog.config 当中

   <?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-AspNetCore.txt">
   ​
     <!-- enable asp.net core layout renderers -->
     <extensions>
       <add assembly="NLog.Web.AspNetCore"/>
     </extensions>
   ​
     <!-- the targets to write to -->
     <targets>
       <!-- File Target for all log messages with basic details -->
       <target xsi:type="File" name="allfile" fileName="c:\temp\nlog-AspNetCore-all-${shortdate}.log"
               layout="${longdate}|${event-properties:item=EventId_Id:whenEmpty=0}|${level:uppercase=true}|${logger}|${message} ${exception:format=tostring}" />
   ​
       <!-- File Target for own log messages with extra web details using some ASP.NET core renderers -->
       <target xsi:type="File" name="ownFile-web" fileName="c:\temp\nlog-AspNetCore-own-${shortdate}.log"
               layout="${longdate}|${event-properties:item=EventId_Id:whenEmpty=0}|${level:uppercase=true}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}|${callsite}" />
   ​
       <!--Console Target for hosting lifetime messages to improve Docker / Visual Studio startup detection -->
       <target xsi:type="Console" name="lifetimeConsole" layout="${MicrosoftConsoleLayout}" />
     </targets>
   ​
     <!-- rules to map from logger name to target -->
     <rules>
       <!--All logs, including from Microsoft-->
       <logger name="*" minlevel="Trace" writeTo="allfile" />
   ​
       <!--Output hosting lifetime messages to console target for faster startup detection -->
       <logger name="Microsoft.Hosting.Lifetime" minlevel="Info" writeTo="lifetimeConsole, ownFile-web" final="true" />
   ​
       <!--Skip non-critical Microsoft logs and so log only own logs (BlackHole) -->
       <logger name="Microsoft.*" maxlevel="Info" final="true" />
       <logger name="System.Net.Http.*" maxlevel="Info" final="true" />
   ​
       <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
     </rules>
   </nlog>

4. 修改 program.cs 文件，代码如下

   using Microsoft.AspNetCore.Hosting;
   using Microsoft.Extensions.Hosting;
   using Microsoft.Extensions.Logging;
   using System;
   using NLog.Web;
   ​
   namespace ASP.NET_Core_5_NLog_Example
   {
       public class Program
       {
           public static void Main(string[] args)
           {
               var logger = NLog.LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
   ​
               try
               {
                   logger.Debug("init main");
                   CreateHostBuilder(args).Build().Run();
               }
               catch (Exception exception)
               {
                   //NLog: catch setup errors
                   logger.Error(exception, "Stopped program because of exception");
                   throw;
               }
               finally
               {
                   // Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
                   NLog.LogManager.Shutdown();
               }
           }
   ​
           public static IHostBuilder CreateHostBuilder(string[] args) =>
               Host.CreateDefaultBuilder(args)
                   .ConfigureWebHostDefaults(webBuilder =>
                   {
                       webBuilder.UseStartup<Startup>();
                   })
                   .ConfigureLogging(logging =>
                   {
                       logging.ClearProviders();
                       logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
                   })
                   .UseNLog();  // NLog: Setup NLog for Dependency injection
       }
   }

5.