log4Net - System.ArgumentNullException: value can't be null

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I am making console application and using log4Net for logging.
My "RollingLogFileAppender" appender in App.Config file is as follows:

XML

<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
	<file type="log4net.Util.PatternString" value=".\MsgBoxlog.log" />   
	<appendtofile value="true" />   
	<rollingstyle value="Size" />   
	<maxsizerollbackups value="5" />   
	<maximumfilesize value="2MB" />   
	<staticlogfilename value="true" />   
	<layout type="log4net.Layout.PatternLayout">
	  <param name="Header" value="[BEGIN LOGGING AT %date]%newline" type="log4net.Util.PatternString" />
	  <param name="Footer" value="[END LOGGING AT %date]%newline" type="log4net.Util.PatternString" />
	  <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n" />
	</layout>  
</appender>

But when I am executing application, I am getting the following error:

log4net:ERROR XmlHierarchyConfigurator: Could not create Appender [RollingLogFileAppender] of type [log4net.Appender.RollingFileAppender]. Reported error follows.
System.ArgumentNullException: Value cannot be null.
Parameter name:fileName
    at System.IO.FileInfo..ctor(String fileName)
    at log4net.Appender.RollingFileAppender.CleanUpHistoryLogFiles()
    at log4net.Appender.RollingFileAppender.ActivateOption()
    at log4net.Repository.Hierarchy.XmlHierarchyConfigurator.ParseAppender(XmlElement appenderElement)
log4net:Error XmlHierarchyConfigurator: Appender named [RollingLogFileAppender] not found.
log4net: XmlHierarchyConfigurator: Hierarchy Threshold []

Posted 16-Mar-11 7:07am

Zia Mehdi

Updated 16-Mar-11 11:03am

Kythen

v3

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Wendelius 16-Mar-11 13:13pm

Enhanced readability

Zia Mehdi 16-Mar-11 13:50pm

Thanks Mike

2 solutions

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#realJSOP · Answer 1 · 2011-03-16T08:53:00

Solution 2

Check this link out:

RollingFileAppender tips[^]

BTW, google is pretty handy...

Posted 16-Mar-11 8:53am

#realJSOP

Comments

Zia Mehdi 16-Mar-11 15:30pm

I have googled this but it is the special condition.
Previously my "RollingLogFileAppender" was configured with RollingStyle="Date" and it was working fine. But when I change this with RollingStyle="Size" since then it is giving me error. Even if I change RollingStyle="Date" with the same other values it works fine agian. I don't know what is the problem with the SIZE rollingstyle.

fjdiewornncalwe 16-Mar-11 23:04pm

Zia, you may be missing some configuration information in your application. Different types of appenders require different settings to be defined. I haven't read all of your code snippet so I can't offhand tell you what is missing if anything.

Zia Mehdi 17-Mar-11 11:28am

Thanks Marcus.
I have changed all settings of RollingFileAppender for RollingStyle "Size". Even then it is saying RollingFileAppender not found. I guess it should atleast find the appender.

#realJSOP · Answer 2 · 2011-03-16T07:37:00

Solution 1

The argument fileName can't be null or an empty string. Look in your C# code. Try running your code under the debugger. It will stop at (or near) the point of failure.

Posted 16-Mar-11 7:37am

#realJSOP

v2

Comments

Zia Mehdi 16-Mar-11 13:54pm

File is defined in App.Config file ".\MsgBoxlog.log".
Previously my "RollingLogFileAppender" was configured with RollingStyle="Date" and it was working fine. But when I change this with RollingStyle="Size" since then it is giving me error.
Even if I change RollingStyle="Date" with the same other values it works fine agian.
I don't know what is the problem with the SIZE rollingstyle.