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POEliminate duplicate logging in log4net
 

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    <p>I have a program that makes many log4net calls to the "myprogram" loggers. It also calls other code that makes log4net calls to other loggers. I want to capture all logs higher than INFO for "myprogram" and all logs higher than WARN for everything else. This way, I get the work-in-progress messages specific to the task I'm working on, but am still notified of potentially bad things happening in the supporting code. I want this sent to both Console and a log file.</p> <p>I have the following log4net config:</p> <pre class="lang-xml prettyprint-override"><code>&lt;log4net&gt; &lt;root&gt; &lt;level value="WARN" /&gt; &lt;appender-ref ref="Console" /&gt; &lt;appender-ref ref="LogFile" /&gt; &lt;/root&gt; &lt;logger name="myprogram"&gt; &lt;level value="INFO" /&gt; &lt;appender-ref ref="Console" /&gt; &lt;appender-ref ref="LogFile" /&gt; &lt;/logger&gt; &lt;appender name="Console" type="log4net.Appender.ConsoleAppender"&gt; &lt;layout type="log4net.Layout.PatternLayout"&gt; &lt;conversionPattern value="%message%newline" /&gt; &lt;/layout&gt; &lt;threshold value="INFO" /&gt; &lt;/appender&gt; &lt;appender name="LogFile" type="log4net.Appender.RollingFileAppender"&gt; &lt;layout type="log4net.Layout.PatternLayout"&gt; &lt;conversionPattern value="- %utcdate %level %logger %ndc %thread %message%newline" /&gt; &lt;/layout&gt; &lt;appendToFile value="false" /&gt; &lt;staticLogFileName value="true" /&gt; &lt;rollingStyle value="Once" /&gt; &lt;file value="mylogfile" /&gt; &lt;immediateFlush value="true" /&gt; &lt;threshold value="INFO" /&gt; &lt;lockingModel type="log4net.Appender.FileAppender+MinimalLock" /&gt; &lt;/appender&gt; &lt;/log4net&gt; </code></pre> <p>This makes perfect sense to me: log >WARN for everything and >INFO for the specific "myprogram" logger.</p> <p>The problem is that I'm getting INFO messages logged <strong>twice</strong> on both Console and LogFile. This only happens if I have both the <code>&lt;root&gt;</code> and <code>&lt;logger&gt;</code> elements filled though; if I remove either one, then the remaining one works as I expect. </p> <p>I could understand if I was getting double-logging of WARN entries (since myprogram matches both "root" and "myprogram"), but it's happening at INFO even though ROOT is (presumably) set to WARN. </p> <p>Am I doing something wrong here, or is this a log4net bug/ambiguity?</p>
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