NLog安装：
Install-Package NLog
NLog配置：
<?xml version="1.0" encoding="utf-8" ?>
<configuration> <configSections>
<section name="nlog" type="NLog.Config.ConfigSectionHandler,NLog" />
</configSections> <!--autoReload="true"表示在不重新启动应用程序的情况下，修改配置文件，NLog会自动加载应-->
<!--NLog内部的日志消息写到应用程序目录下的logs文件夹里的internalLog.txt文件中；（-->
<nlog autoReload="true" internalLogLevel="Trace" internalLogFile="logs/internalLog.txt">
<targets>
<!--文件输出(type="File")-->
<target name="FileOutput" type="File" fileName="${basedir}/logs/${shortdate}.log"
layout="${longdate} ${callsite} ${level}:
${message} ${event-context:item=exception} ${stacktrace} ${event-context:item=stacktrace}" />
<!--控制台输出(type="File")-->
<target name="ConsoleOutput" type="Console" layout="${date:format=yyyy-MM-dd HHmmss} ${callsite} ${level} ${message}"></target>
</targets>
<rules>
<!--<logger name="Test" minlevel="Debug" maxlevel="Error" writeTo="FileOutput,ConsoleOutput" />-->
<logger name="*" minlevel="Debug" maxlevel="Error" writeTo="FileOutput,ConsoleOutput" />
</rules>
</nlog> <startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
</configuration>
NLog使用：
private static readonly Logger Logger = LogManager.GetCurrentClassLogger();//LogManager.GetLogger("Test");
static void Main(string[] args)
{
Logger.Trace("This is Trace");
Logger.Debug("This is Debug");
Logger.Info("This is Info");
Logger.Error("This is Error");
Logger.Fatal("This is Fatal");
Console.ReadLine();
}