1.引入Nuget包
Nlog
Nlog.Web.AspNetCore
2.添加nlog配置文件
1 <?xml version="1.0" encoding="utf-8" ?> 2 <nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" 3 ??????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 ?????autoReload="true" 5 ???????internalLogLevel="Warn" 6 ???????internalLogFile="internal-nlog.txt"> 7 ?????<!--define various log targets--> 8 ?????<targets> 9 ????????<!--write logs to file-->10 ?????????<target xsi:type="File" name="allfile" fileName="nlog-all-${shortdate}.log"11 ??????????????????layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />12 ????13 ?????????<target xsi:type="File" name="ownFile-web" fileName="nlog-my-${shortdate}.log"14 ??????????????????layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />15 ????????<target xsi:type="Null" name="blackhole" />16 ??</targets>17 ?????<rules>18 ?????????<!--All logs, including from Microsoft-->19 ?????????<logger name="*" minlevel="Trace" writeTo="allfile" />20 ????21 ???????<!--Skip Microsoft logs and so log only own logs-->22 ?????????<logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />23 ?????????<logger name="*" minlevel="Trace" writeTo="ownFile-web" />24 ??</rules>25 </nlog>3.使用nlog
在StartUp.cs中配置配置日志中间件
1 ??public void Configure(IApplicationBuilder app, IHostingEnvironment env,ILoggerFactory loggerFactory) 2 ????????{ 3 ????????????app.UseStaticFiles(); 4 ????????????//使用NLog作为日志记录工具 5 ????????????loggerFactory.AddNLog(); 6 ????????????//引入Nlog配置文件 7 ????????????env.ConfigureNLog("nlog.config"); 8 ????????????if (env.IsDevelopment()) 9 ????????????{10 ????????????????app.UseDeveloperExceptionPage();11 ????????????} 12 ????????????app.UseMvc();13 ????????}4.在程序中中使用nlog写日志
下面是注入到控制器中的示例
1 ?public class ValuesController : Controller 2 ????{ 3 ??????4 ????????private ILogger<ValuesController> logger; 5 ????????public ValuesController(ILogger<ValuesController> _logger) 6 ????????{ 7 ????????????logger = _logger; 8 ????????} 9 ????????// GET api/values10 ????????[HttpGet]11 ????????public string Get()12 ????????{13 ????????????logger.LogError("123");14 ????????????return "value";15 ????????}调用该api,然后查看文件目录
5.日志文件生成在指定目录下
大家会发现文件是生成在项目目录下的，日志多的时候，会导致文件目录太乱
此时，只需更改nlog.config中的内容如下即可生成在logs目录里
<targets> ???????<!--write logs to file--> ????????<target xsi:type="File" name="allfile" fileName="logs/all/nlog-all-${shortdate}.log" ?????????????????layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" /> ????????????<target xsi:type="File" name="ownFile-web" fileName="logs/my/nlog-my-${shortdate}.log" ?????????????????layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" /> ???????<target xsi:type="Null" name="blackhole" /> ?</targets>.NET Core使用Nlog记录日志
原文地址：https://www.cnblogs.com/qmhuang/p/8305915.html