.net Core API 添加 NLog

nlog.config

<?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>

<?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"><!-- 启用.net core的核心布局渲染器 --><extensions><add assembly="NLog.Web.AspNetCore" /></extensions><!-- 写入日志的目标配置 --><targets><!-- 调试  --><target xsi:type="File" name="debug" fileName="logs/debug-${shortdate}.log" layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" /><!-- 警告  --><target xsi:type="File" name="warn" fileName="logs/warn-${shortdate}.log" layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" /><!-- 错误  --><target xsi:type="File" name="error" fileName="logs/error-${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><!-- 映射规则 --><rules><!-- 调试  --><logger name="*" minlevel="Trace" maxlevel="Debug" writeTo="debug" /><!--跳过不重要的微软日志--><logger name="Microsoft.*" maxlevel="Info" final="true" /><!-- 警告  --><logger name="*" minlevel="Info" maxlevel="Warn" writeTo="warn" /><!-- 错误  --><logger name="*" minlevel="Error" maxlevel="Fatal" writeTo="error" /></rules>
</nlog>

program.cs 

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 errorslogger.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}

NuGet packages：NLog、NLog.Web.AspNetCore