xdzgor | 18 Nov 09:23 2014


Hi - Is it possible to create "exceptions" in logger configurations? Like,
log all classes in a hierarchy except one sub-hierarchy?

For example, I have a lot of classes under a namespace (and sub-namespaces)
starting "Alpha". I'd like to DEBUG log all these classes, except any under
a particular sub-namespace ("Alpha.Import.Core").

Eg something like:

<appender name="one" ...>

<logger name="Alpha" additivity="true" BUT NOT "Alpha.Import.Core">
  <level value="DEBUG" />
  <appender-ref ref="one" />

Thanks for any tips,

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Andre Cassar | 30 Oct 22:01 2014

Programmatically add newline to header & footer

Hi guys,

I'm configuring log4net programmatically and not using the xml configuration. I want to be able to add a newline to the header and footer. How can you do that? I tried %newline, \r,\n, &#13;&#10; but all in vain. 

My code looks like this:

PatternLayout patternLayout = new PatternLayout();
            patternLayout.ConversionPattern = "%date [%thread] %-5level %logger : %message%newline";
            patternLayout.Header = "%newline****** [Logging Started] ******%n[Date] [Thread ID] [Level] [Logger] : [Log Entry]&#13;&#10;";
            patternLayout.Footer = "****** [Logging Stoped] ******&#13;&#10;";
Any ideas please?

Thanks beforehand
Andre Cassar
Goyal, Nitin UTAS | 30 Oct 08:01 2014

How to push the List<> values in Ilogger.Info



I have a huge list of data say like 5k values and I want to push them into the logger.Info of log4net.

If there are individual string values, I am able to do so and accordingly modified the conversion pattern but now I want to push all those values in the list and thus is there anyway I can do so.

Also, I need to modify the conversion pattern too. For conversion pattern, I can make a string using for loop and override the Patternlayout class and set the conversion pattern for all the 5k values but how to put those values from List to those values?


Nitin Goyal – Technical Lead, Software – Sensors & Integrated Systems


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Calin Pavel | 17 Oct 11:55 2014

All threads blocked while logging

Hello everybody,

I do have an .NET application (Windows Service) that collects data from a lot of sources (DBs, log files, machines event logs, ...) and uses Log4Net to log details of the actions / execution.  As expected, I'm using a high number of threads to collect data, threads that are writing logs in some files (RollingFileAppenderer).

Lately it happens that the entire application is BLOCKED because all threads were trying to acquire a read lock, like in the stack trace:
000000001ac3d998 00000000774715fa [HelperMethodFrame: 000000001ac3d998] System.Threading.Thread.SleepInternal(Int32)
000000001ac3da90 000007fef747b5e9 System.Threading.Thread.Sleep(Int32)
000000001ac3dac0 000007fef5fb9631 System.Threading.ReaderWriterLockSlim.EnterMyLockSpin()
000000001ac3db90 000007fef5cd297e System.Threading.ReaderWriterLockSlim.TryEnterReadLockCore(TimeoutTracker)
000000001ac3dbf0 000007fef5cd28fa System.Threading.ReaderWriterLockSlim.TryEnterReadLock(TimeoutTracker)
000000001ac3dc40 000007fe98fb4efd log4net.Repository.Hierarchy.Logger.CallAppenders(log4net.Core.LoggingEvent)
000000001ac3dcc0 000007fe98fb4907 log4net.Repository.Hierarchy.Logger.Log(System.Type, log4net.Core.Level, System.Object, System.Exception)
000000001ac3dd30 000007fe98fb47f9 log4net.Core.LogImpl.Info(System.Object) 

Did you encountered this before or did anybody else reported similar problems?

May be it's important to mention:
- I'm using Log4Net 1.2.13, .NET 4.5 on Windows 2008 R2
- that my threads have a timeout, and if they do not finish the job in the given interval they are aborted.

In relation with this, I found a possible explanation of application hanging here: http://chabster.blogspot.ro/2013/07/a-story-of-orphaned-readerwriterlockslim.html

Could it be that the acquire of read lock in Logger.CallAppenderers method to generate our problems?

Thank you in advance,
Calin Pavel
Rob Richardson | 3 Oct 22:45 2014

Two logs have the same appenders

I want to get two independent sets of appender objects from the same configuration file, so that I can use
different file names in a FileAppender, for example.  But the standard way of getting appender objects is
to use the LogManager object, which is static.  Since there's only one LogManager, it will always return
the same set of appender objects.  So, I get one ILog object, get its FileAppender object, set its file name,
and write a message, and it appears in the expected file.  Then, I get another ILog object, get the
FileAppender object,  set its file name to some other file, and write a message, and that message appears in
the second file.  Finally, I go back to the first file appender, write another message, and it appears in the
second appenders file.  

Is there a way to copy a FileAppender object, or to get a new object for the same appender name out of the LogManager?

Thanks very much!

RobR, who will probably have to just build the logger programmatically instead of using a configuration file
Steve Hueners | 18 Aug 22:07 2014

AdoNetAppender on Azure SQL: Works then quits working

Last week I stepped thru the hoops required to configure a connection
string for my Azure SQL  db and confirmed that logging was working as
expected. Log messages were stored for several days, but at some
point, the logging ceased. I re-published the site (without changing
anything related to Log4Net) and logging was again active. Any other
similar reports? Anything non-optimal with my config?

much appreciated!

    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <bufferSize value="1" />
      <connectionType value="System.Data.SqlClient.SqlConnection,
System.Data,  Version=, Culture=neutral,
PublicKeyToken=b77a5c561934e089" />

Timeout=30;" />
      <commandText value="INSERT INTO CULog
([Date],[Level],[Message],[Exception], Logger) VALUES ( <at> log_date,
 <at> log_level,  <at> message,  <at> exception,  <at> logger)" />
        <parameterName value=" <at> log_date" />
        <dbType value="DateTime" />
        <layout type="log4net.Layout.RawTimeStampLayout" />
        <parameterName value=" <at> log_level" />
        <dbType value="String" />
        <size value="50" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%level" />
        <parameterName value=" <at> message" />
        <dbType value="String" />
        <size value="4000" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%message" />

        <parameterName value=" <at> exception" />
        <dbType value="String" />
        <size value="4000" />
        <layout type="log4net.Layout.ExceptionLayout" />
        <parameterName value=" <at> logger" />
        <dbType value="String" />
        <size value="4000" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%logger" />

Ananth Tatachar | 14 Aug 17:51 2014

Inconsistent results observed while using BufferingForwardAppender

I am working with log4net version : .


I am getting inconsistent results , while using RollingFileAppender with BufferingForwardAppender.

My application is a multithreaded application. I spawned 5 threads Each will call the constructor of MyClass and SomeFunction once.

My application's sertup is as follows:




 <appender name="RollingLocalFileAppender" type="log4net.Appender.RollingFileAppender">
file type="log4net.Util.PatternString" value="C:\Logs\TFile.log" />
rollingStyle value="Date" />
datePattern value="yyyy-MM-dd" />
maxSizeRollBackups value="10" />
appendToFile value="true" />
layout type="log4net.Layout.PatternLayout">
conversionPattern value="%level %date{yyyy-MM-dd'T'HH:mm:ss.fffzzz} %property{hostname}  %property{guid} %message%newline" />
appender name="BufferedFileAppender" type="log4net.Appender.BufferingForwardingAppender">
bufferSize value="512" />
evaluator type="log4net.Core.TimeEvaluator">

        <interval value="10" />
<!--Send buffered events immediately if 10 seconds pass-->
<Fix value="0" />
<!--Buffering can have severe performance degradation if this is set to the default (ALL)-->



Logging Class:



Class MyClass


public MyClass()


Log4net.ThreadContext.Properties["guid"] = Guid.NewGuid();



public void SomeFunction()


Ilog log = LogManager.GetLogger(typeof(MyClass));

Log.Info("my message");








Observed Results:


INFO 2014-08-14T10:47:36.659-04:00 ANANTHTATACHAR MyAudsDigest [LQR-Y8c71EmtWl7ZqItYoQ] my message

INFO 2014-08-14T10:47:36.659-04:00  ANANTHTATACHAR MyAudsDigest  [9hDzS-_Su0SrEoXZF_aGMw] my message

INFO 2014-08-14T10:47:36.729-04:00 ANANTHTATACHAR MyAudsDigest  [GsxT7aTfNEq1uIsqPYeZ5w]  my message

INFO 2014-08-14T10:47:36.789-04:00 ANANTHTATACHAR MyAudsDigest [9hDzS-_Su0SrEoXZF_aGMw] my message

INFO 2014-08-14T10:47:36.955-04:00 ANANTHTATACHAR MyAudsDigest  [9hDzS-_Su0SrEoXZF_aGMw] my message




Expected Results:

Unique guid in all the messages.








I understand that Fix value  NONE in log4net.Appender.BufferingForwardingAppender will not fix any volatile variables , but making it all results in all my guids in all the 5 messages becoming same.


Could anybody please tell me how to fix this issue?

Mohkam Singh Sawhney | 14 Aug 12:31 2014

RollingFileAppender overwriting previous log files on application restart


I am using log4Net v1.2.13 in a .NET 4 C# project. I have setup a RollingFileAppender to roll on size. My aim is to keep appending to a log file and roll on size. I need to maintain all the previous log files. But I found that every time my application restarts all the log files after the 2nd log file that was generated in the previous run get overwritten.

For testing purposes I set the rollover size to 3KB. Below is the appender configuration.

<appender name="RollingAppender" type="log4net.Appender.RollingFileAppender">
<file value="logs22\myFile_d.log" />
<appendToFile value="true" />
<rollingStyle value="size" />
<staticLogFileName value="false" />
<maximumFileSize value="3KB" />
<countDirection value="1" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value = "%date %-5level [%logger] %message%newline%exception"/>

On first run of my application the appender rolls the log files on size. It created 3 log files myFile_d.log.0, myFile_d, myFile_d.log.2.  Each log file was around 5KB before getting rolled.

When I ran the application again, this time instead of creating a new log file myFile_d.log.3, Log4Net started overwriting the second log file that was generated earlier (that is myFile_d.log.1 was overwritten). It then proceeded to overwrite myFile_d.log.2.

I updated the config and included <maxSizeRollBackups value="-1" />. This time log files were rolled without any overwriting of existing files.

A similar scenario described in this issue tracker - LOG4NET-378. The bug has been closed with resolution fixed in v1.2.12.

I would appreciate it if somebody could confirm the following points
1. What is the default value of maxSizeRollBackups if it is not mentioned in the config file. I could not find this in documentation for this property.

2. For the scenario that I described is expected to include maxSizeRollBackups=-1 in the config file?

Thanks and Regards,

Mohkam Singh

Venkatasamy, Vanitha | 7 Aug 18:43 2014

Section or group name 'log4net' is already defined

I have a parent and child application. Log4net has been declared in both the web.config’s


Suddenly I started getting this below error in child application.


Exception information:

    Exception type: ConfigurationErrorsException

    Exception message: Section or group name 'log4net' is already defined. Updates to this may only occur at the configuration level where it is defined. (\web.config line 5)



If I remove the section from child web.config, some other error .


Any suggestion to look for



Vanitha Venkatasamy

XPAND Corporation.




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Shing Hing Man | 2 Aug 19:09 2014

How to specify a log output folder in RollingFileAppender

  I am trying to set up llog4net  to use RollingFileAppender in  F# in VS 2013.

 <appender name="Roll" type="log4net.Appender.RollingFileAppender">
      <file      value="log_"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <staticLogFileName value="false" />
      <datePattern value="yyyy_MM_dd.'txt'"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %m%n" />

The above works. The log file log_2014_08_02.txt ends up  in {project}/bin/Debug directory.

However, I would like the log file to be in c:\ ,say.
I have tried
    <file      value="c:\log_"/>
  <file      value="${HOMEDRIVE}\log_"/>
but none of the above works.

How to set up <file> so that the output directory is in c:\  ?
Thanks in advance for your assistance!


Ananth Tatachar | 24 Jul 02:31 2014

Fwd: Log4net.ThreadContext.Properties Having stale data. How to resolve it?

---------- Forwarded message ----------
From: Ananth Tatachar <ananth.tatachar <at> gmail.com>
Date: Wed, Jul 23, 2014 at 8:24 PM
Subject: Log4net.ThreadContext.Properties Having stale data. How to resolve it?
To: log4net-user <at> logging.apache.org

I am using a RollingFileAppender , and my own custom layout. My application is multithreaded. Each thread will generate unique random data and is supposed to log it using log4net framework. However if I create multiple threads in quick succession I notice stale data in my logs , this goes away if each thread sleeps for 50 ms before logging. I am not able to figure out a solution to this issue or find its cause please do help me.

My logging function looks like this:

    log4net.ThreadContext.properties["randomGeneratedData"] = randomGeneratedData;
    private ILog myLog = 
    using (log4net.NDC.Push("ndcTest1"))
        using (log4net.NDC.Push("ndcTest2"))

Result of logging:

       NDC = "ndcTest1 ndcTest2" , randomGeneratedData = rad1
       NDC = "ndcTest1 ndcTest2" , randomGeneratedData = rad2
       NDC = "", randomGeneratedData = rad2 

and so on ...

I tried to clear log4net.ThreadContext.Properties before filling it again , but it was of no use. Please help.