clarrification needed in log4net

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Hello all,

I have used the following URL to implement log4net,
[code_project], Can anyone please help me to understand step 6?

C#

if (log.IsErrorEnabled)
{
    log.Error("Page Load failed : " + ex.Message);
}

I don't understand how if (log.IsErrorEnabled) works...

Regards

Posted 20-Mar-12 3:09am

Sebastian T Xavier

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Steve Maier · Answer 1 · 2012-03-20T06:06:00

The property for IsErrorEnabled checks your app.config file to see if you have that level of logging turned on. You can turn on the logging like this to have error logging on. You would also have to have an appender installed named EventLogAppender. But the level can be changed to just WARN or INFO or DEBUG so that it will only log above that level. So in this example it logs for errors only. If it was using WARN then a call to check for errors would still return true since it is a higher level.

XML

<root>
  <level value="ERROR"/>
  <priority value="ERROR"/>
  <appender-ref ref="EventLogAppender"/>
</root>

If you need more help with log4net, let me know.

Sebastian T Xavier · Answer 2 · 2012-03-20T19:05:00

Yes Steve, I still have doubt..

I have added the following code in my web.config file

HTML

<log4net debug="true">
     <appender name="RollingLogFileAppender">
               type="log4net.Appender.RollingFileAppender">
          <file value="C:\\TestProj\\TestLog.txt" />
        <appendtofile value="true" />
        <rollingstyle value="Size" />
        <maxsizerollbackups value="10" />
        <maximumfilesize value="2KB" />
        <staticlogfilename value="true" />
        <layout type="log4net.Layout.PatternLayout">
            <conversionpattern value="%-5p %d %5rms %-22.22c{1} %-18.18M - %m%n" />
        </layout>
     </appender>
     <root>
	 <level value="INFO" />
	<appender-ref ref="RollingLogFileAppender" />
     </root>
</log4net>

And added the following code in the .cs file

C#

ILog log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
log.Debug("This a test debug message");

In this case nothing is getting written in the file. What I understood from the above reply is, it should log the content to the file as I am not checking any conditions, even if the log level is INFO.

I think the above code should write something to log file and the following code shouldn't, as there is a check.

C#

ILog log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
    if (log.IsDebugEnabled)
    {
       log.Debug("This a test debug message");
    }

Can you help me on this?

Thanks

clarrification needed in log4net

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