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    copied!<h2>Treating exceptions differently</h2> <p>We often want to get more information when there is an exception. The following configuration has two targets, a file and the console, which filter on whether or not there is any exception info. (EDIT: Jarek has posted about a <a href="http://nlog-project.org/2011/04/20/exception-logging-enhancements.html" rel="noreferrer">new method of doing this in vNext</a>.)</p> <p>The key is to have a wrapper target with <code>xsi:type="FilteringWrapper" condition="length('${exception}')&gt;0"</code></p> <pre><code>&lt;nlog xmlns="http://www.nlog-project.org/schemas/NLog.mono2.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" autoReload="true" internalLogLevel="Warn" internalLogFile="nlog log.log" &gt; &lt;variable name="VerboseLayout" value="${longdate} ${level:upperCase=true} ${message} (${callsite:includSourcePath=true})" /&gt; &lt;variable name="ExceptionVerboseLayout" value="${VerboseLayout} (${stacktrace:topFrames=10}) ${exception:format=ToString}" /&gt; &lt;targets async="true"&gt; &lt;target name="file" xsi:type="File" fileName="log.log" layout="${VerboseLayout}"&gt; &lt;/target&gt; &lt;target name="fileAsException" xsi:type="FilteringWrapper" condition="length('${exception}')&gt;0"&gt; &lt;target xsi:type="File" fileName="log.log" layout="${ExceptionVerboseLayout}" /&gt; &lt;/target&gt; &lt;target xsi:type="ColoredConsole" name="console" layout="${NormalLayout}"/&gt; &lt;target xsi:type="FilteringWrapper" condition="length('${exception}')&gt;0" name="consoleException"&gt; &lt;target xsi:type="ColoredConsole" layout="${ExceptionVerboseLayout}" /&gt; &lt;/target&gt; &lt;/targets&gt; &lt;rules&gt; &lt;logger name="*" minlevel="Trace" writeTo="console,consoleException" /&gt; &lt;logger name="*" minlevel="Warn" writeTo="file,fileAsException" /&gt; &lt;/rules&gt; &lt;/nlog&gt; </code></pre>
 

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