在ASP.NET中如何输出日志

<configuration>
<configSections>
<!--Nlog-->
<section name="nlog" type="NLog.Config.ConfigSectionHandler, NLog"/>
</configSections>

<!--Nlog-->
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<variable name="logDirectory" value="${basedir}/logs"/>
<targets>
<default-target-parameters xsi:type="File" keepFileOpen="false"/>
<target name="file" xsi:type="File" fileName="${logDirectory}/${shortdate}.txt" layout="${longdate} | ${level} | ${message}"/>
<target name="file1" xsi:type="console" layout="${message}"/>
</targets>
<rules>
<logger name="*" minlevel="Info" writeTo="file,file1"/>
</rules>
</nlog>

</configuration>

private static NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();