当前环境： win10+vs2019+netcore3.1
添加Nuget包引用：NLog.Web.AspNetCore
2. 添加 nlog.config配置文件 或者安装包 nlog.confg
<?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.txt"> <!-- enable asp.net core layout renderers --> <extensions> <add assembly="NLog.Web.AspNetCore"/> </extensions> <!-- the targets to write to --> <targets> <!-- write logs to file --> <target xsi:type="File" name="allfile" fileName="logs\nlog-all-${shortdate}.log" layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" /> <!-- another file log, only own logs. Uses some ASP.NET core renderers --> <target xsi:type="File" name="ownFile-web" fileName="logs\nlog-own-${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> <!-- 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" /> <!-- BlackHole without writeTo --> <logger name="*" minlevel="Trace" writeTo="ownFile-web" /> </rules> </nlog>
3. 在CreateHostBuilder 中添加使用Nlog ( ConfigureLogging)
public static IHostBuilder CreateHostBuilder(string[] args) { return Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); }).ConfigureLogging( logging => { // 清除系统默认的日志 //logging.ClearProviders(); logging.SetMinimumLevel(LogLevel.Trace); }).UseNLog(); }
4. 配置文件路径
NLog.Web.NLogBuilder.ConfigureNLog("nlog.config")
5. 调用
public class HomeController : Controller { private readonly ILogger<HomeController> _logger; public HomeController(ILogger<HomeController> logger) { _logger = logger; _logger.LogDebug(1, "NLog injected into HomeController"); } public IActionResult Index() { _logger.LogInformation("Hello, this is the index!"); return View(); } }
6. 效果
在bin\Debug\netcoreapp3.1 目录下生成了logs文件夹
原文：https://www.cnblogs.com/wtujvk/p/13222233.html
