.net core 2.1 Nlog.Web.AspNetCore Nlog日志

1、先创建 .net core web 应用程序,选择api

 

 

 

 

 

 

2、安装 nuget 包：nlog.web.aspnetcore

install-package nlog
install-package nlog.web.aspnetcore

或者打开nuget管理界面搜索nlog.web.aspnetcore(我安装的版本是v4.9.0)

3、添加配置文件： nlog.config  

 

 注意，此处nlog.config最好是小写的，需修改属性使其始终复制

<?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="c:\temp\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="c:\temp\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>

配置appsettings.json

 "logging": {
    "loglevel": {
      "default": "trace",
      "microsoft": "information"
    }
  }

4、注册日志依赖

方法一：通过修改program.cs

//需引用
//using microsoft.extensions.logging;
//using nlog.web;
 
public class program
    {
        public static void main(string[] args)
        {
            nlog.web.nlogbuilder.configurenlog("nlog.config");
            createwebhostbuilder(args).build().run();
        }

        public static iwebhostbuilder createwebhostbuilder(string[] args) =>
            webhost.createdefaultbuilder(args)
                .usestartup<startup>()
                .configurelogging(logging =>
                 {
                     logging.clearproviders(); //移除已经注册的其他日志处理程序
                     logging.setminimumlevel(microsoft.extensions.logging.loglevel.trace); //设置最小的日志级别
                 })
                 .usenlog();
    }

方法二：通过修改startup.cs里的configure函数

//需引用
//using nlog.extensions.logging;
//using nlog.web;

public void configure(iapplicationbuilder app, ihostingenvironment env, iloggerfactory loggerfactory)
        {
            if (env.isdevelopment())
            {
                app.usedeveloperexceptionpage();
            }
            else
            {
                app.usehsts();
            }

            app.usehttpsredirection();

            loggerfactory.addnlog();//添加nlog
            env.configurenlog("nlog.config");//读取nlog配置文件

          
            app.usemvc();
        }

5、修改 controller, 输出日志：

 

  [route("api/")]
    public class logincontroller : controller
    {
        private ilogger<logincontroller> logger;
         public logincontroller(ilogger<logincontroller> _logger)
        {
             logger = _logger;
          }


        [route("login")]
        [httpget]
        public stringlogin()
        {
            logger.loginformation("info日志");
            logger.logerror("error日志");
            logger.logwarning("warning日志");
            logger.logcritical("critical日志");
            logger.logwarning("warning日志");
            logger.logtrace("trace日志");
            logger.log(loglevel.warning, "logwarn日志");
            logger.log(loglevel.debug, "logdebug日志");
            logger.log(loglevel.error, "logerror日志");
            return "";
        }
}     

 

打印日志的时候有两种方式

 logger.log(loglevel.warning, "logwarning日志:"); //标红的地方可以选择日志的级别 

 logger.logwarning("warning日志");//直接调内置的级别函数

6、结果

 程序跑起来之后会出现前两个文件~访问完接口后会出现最后那个文件

internal-nlog 记录了nlog的启动及加载config的信息。
nlog-all 记录了所有日志
nlog-own 记录了我们自定义的日志

 7、修改配置

 打开官方提供的nlog.config  配置参考 https://github.com/nlog/nlog/wiki/configuration-file

子节点<target>  配置参考 

属性layout表示输出文本格式 配置参考 

子节点<rule>  日志的路由表  顺序是从上往下 一个<logger>就是一个路由信息

日志级别：trace >debug> information >warn> error> fatal
<logger>属性:
name - 日志源/记录者的名字 (允许使用通配符*)
minlevel ： 匹配日志范围的最低级别
maxlevel ： 匹配日志范围的*别
level ： 单一日志级别
levels ： 一系列日志级别，由逗号分隔
writeto ： 日志应该被写入的目标，由逗号分隔，与target的你name对应
final ： 为true标记当前规则为最后一个规则。其后的logger不会运行

附最后的配置文档

<?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"
    >


  <!-- the targets to write to -->
  <targets>
    <!-- write logs to file  -->
    <target xsi:type="file" name="allfile" filename="log\${shortdate}-all.log"
            layout="${longdate} | ${event-properties:item=eventid_id:whenempty=0} | ${uppercase:${level}}|${logger} |${message} ${exception:format=tostring}" />

    <!-- another file log, only own logs.uses some asp.net core renderers -->
    <target xsi:type="file" name="errorfile" filename="log\${shortdate}-error.log"
            layout="${longdate} | ${event-properties:item=eventid_id:whenempty=0} | ${uppercase:${level}} | ${logger} | ${message} ${exception:format=tostring} | url: ${aspnet-request-url} | action: ${aspnet-mvc-action} | ${callsite}" />

    <target xsi:type="file" name="taskfile" filename="log\${shortdate}-warn.log"
            layout="${longdate} | ${event-properties:item=eventid_id:whenempty=0} | ${uppercase:${level}} | ${logger} | ${message} ${exception:format=tostring} | url: ${aspnet-request-url} | action: ${aspnet-mvc-action} | ${callsite}" />

    <target xsi:type="file" name="runfile" filename="log\${shortdate}-info.log"
            layout="${longdate} | ${event-properties:item=eventid_id:whenempty=0} | ${uppercase:${level}} | ${logger} | ${message} ${exception:format=tostring} | url: ${aspnet-request-url} | action: ${aspnet-mvc-action} | ${callsite}" />

  </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 = "*" levels="error,warn,critical" writeto="errorfile" />
    <logger name = "*" level="info" writeto="taskfile" />
    <logger name = "*" level="warn" writeto="runfile" final="true"/>

  </rules>
</nlog>

 

参考github: