Nlog的使用

ASP.NET Core 3

參考 

NLog.dll

NLog.Web.AspNetCore.dll

新建NLog.config組態檔

<?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="${basedir}/log/internal.log">

  <!-- enable asp.net core layout renderers -->
  <extensions>
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions>

  <!-- the targets to write to -->
  <targets>
    <target xsi:type="File" name="INFO-web" fileName="${basedir}/log/info${shortdate}.log"
           layout="${longdate}|${uppercase:${level}}|${message} |url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />
    <target xsi:type="File" name="Error-web" fileName="${basedir}/log/error${shortdate}.log"
           layout="${longdate}|${uppercase:${level}}|${message} |url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />
    <target xsi:type="File" name="allfile" fileName="${basedir}/log/all${shortdate}.log"
           layout="${longdate}|${uppercase:${level}}|${message} |url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />
  </targets>

  <!-- rules to map from logger name to target -->
  <rules>
    <!--All logs, including from Microsoft-->
    <logger name="*" minlevel="Trace" writeTo="allfile" />

    <!--Skip non-critical Microsoft logs and so log only own logs-->
    <logger name="Microsoft.*" maxlevel="Info" final="true" />
    <logger name="*" minlevel="Info" writeTo="INFO-web" />
    <logger name="*" minlevel="Error" writeTo="Error-web" />
  </rules>
</nlog>

屬性說明

配置元素

targets –定義日志目標/輸出
rules –定義日志路由規則
extensions –從* .dll檔案加載NLog擴展名
include–包括外部組態檔
variable –設定配置變數的值

目標

name –目標名稱
type–目標型別–例如“檔案”，“資料庫”，“郵件”，使用名稱空間時，此屬性命名為xsi:type

日志級別（降序排列）

Fatal
Error
Warn 
Info
Debug 
Trace

規則

name –記錄器名稱過濾器-可能包含通配符（*和？）

minlevel –最低級別的日志

maxlevel –記錄的最大級別

level –單級登錄

levels -以逗號分隔的要記錄級別的串列

writeTo –以逗號分隔的要寫入的目標串列

final –最終規則匹配后未處理任何規則

enabled-設定為false禁用規則而不洗掉它

ruleName-規則識別符號，允許使用Configuration.FindRuleByName和查找規則 Configuration.RemoveRuleByName，

列：

<target xsi:type="File" name="INFO-web" fileName="${basedir}/log/${shortdate}.log"
           layout="${longdate}|${uppercase:${level}}|${message} |url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />

${basedir}：專案路徑/log/${shortdate}:日期.log

longdate：寫入時間

message：記錄的日志資訊

更改Program

public static void Main(string[] args)
        {
            var logger = NLogBuilder.ConfigureNLog("NLog.config").GetCurrentClassLogger();//配置Nlog檔案
            try {
                logger.Debug("infoMain");
            }
            catch (Exception ex) {
                logger.Error(ex, "Stopped program because of exception");
            }
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                })
                .ConfigureLogging(logging=> {
                    logging.ClearProviders();
                    logging.SetMinimumLevel(LogLevel.Trace);
                }).UseNLog();//注入NLog
    }

控制器

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

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

        public IActionResult Index()
        {
            _logger.LogInformation("LogInformation");
            _logger.LogError("LogError");
            return View();
        }
}

日志檔案位置:bin\Debug\netcoreapp3.1

謹以此用于記錄,不足之處請多指教

參考文章

https://github.com/NLog/NLog/wiki/Configuration-file#configuration-file-locations

https://www.cnblogs.com/dflying/archive/2006/12/15/593158.html

標籤：.NET Core

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