• .NET Core使用Nlog记录日志


    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.在StartUp.cs中配置nlog

     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/values
    10         [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>
     
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  • 原文地址:https://www.cnblogs.com/qmhuang/p/8305915.html
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