.Net项目中NLog的配置和使用实例详解

<?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">

 <targets>
 <!--此部分中的所有目标将自动异步-->
 <target name="asyncFile" xsi:type="AsyncWrapper">
  <!--项目日志保存文件路径说明fileName="${basedir}/保存目录，以年月日的格式创建/${shortdate}/${记录器名称}-${单级记录}-${shortdate}.txt"-->
  <target name="log_file" xsi:type="File"
    fileName="${basedir}/ProjectLogs/${shortdate}/${logger}-${level}-${shortdate}.txt"
    layout="${longdate} | ${message} ${onexception:${exception:format=message} ${newline} ${stacktrace} ${newline}"
    archiveFileName="${basedir}/archives/${logger}-${level}-${shortdate}-{#####}.txt"
    archiveAboveSize="102400"
    archiveNumbering="Sequence"
    concurrentWrites="true"
    keepFileOpen="false" />
 </target>
 <!--使用可自定义的着色将日志消息写入控制台-->
 <target name="colorConsole" xsi:type="ColoredConsole" layout="[${date:format=HH\:mm\:ss}]:${message} ${exception:format=message}" />
 </targets>

 <!--规则配置,final - 最终规则匹配后不处理任何规则-->
 <rules>
 <logger name="Microsoft.*" minlevel="Info" writeTo="" final="true" />
 <logger name="*" minlevel="Info" writeTo="asyncFile" />
 <logger name="*" minlevel="Warn" writeTo="colorConsole" />
 </rules>
</nlog>

< targets >
< target name = “ f1 ” xsi ：type = “ File ” fileName = “ file1.txt ” />
< target name = “ f2 ” xsi ：type = “ File ” fileName = “ file2.txt ” /> 
< target name = “ n1 ” xsi ：type = “ Network ” address = “ tcp：// localhost：4001 ” />
< target name = “ ds ” xsi ：type = “ OutputDebugString ” />
</ targets >

/// <summary>
 /// nLog使用帮助类
 /// </summary>
 public class LoggerHelper
 {
  /// <summary>
  /// 实例化nLog，即为获取配置文件相关信息
  /// </summary>
  private readonly NLog.Logger _logger = LogManager.GetCurrentClassLogger();

  private static LoggerHelper _obj;

  public static LoggerHelper _
  {
   get => _obj ?? (new LoggerHelper());
   set => _obj = value;
  }

  #region Debug，调试
  public void Debug(string msg)
  {
   _logger.Debug(msg);
  }

  public void Debug(string msg, Exception err)
  {
   _logger.Debug(err, msg);
  }
  #endregion

  #region Info，信息
  public void Info(string msg)
  {
   _logger.Info(msg);
  }

  public void Info(string msg, Exception err)
  {
   _logger.Info(err, msg);
  }
  #endregion

  #region Warn，警告
  public void Warn(string msg)
  {
   _logger.Warn(msg);
  }

  public void Warn(string msg, Exception err)
  {
   _logger.Warn(err, msg);
  }
  #endregion

  #region Trace，追踪
  public void Trace(string msg)
  {
   _logger.Trace(msg);
  }

  public void Trace(string msg, Exception err)
  {
   _logger.Trace(err, msg);
  }
  #endregion

  #region Error，错误
  public void Error(string msg)
  {
   _logger.Error(msg);
  }

  public void Error(string msg, Exception err)
  {
   _logger.Error(err, msg);
  }
  #endregion

  #region Fatal,致命错误
  public void Fatal(string msg)
  {
   _logger.Fatal(msg);
  }

  public void Fatal(string msg, Exception err)
  {
   _logger.Fatal(err, msg);
  }
  #endregion
 }