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From "Vanderkolk, John" <John.Vanderk...@compuware.com>
Subject RE: Disable/enable appender for all loggers
Date Mon, 06 Aug 2007 20:15:47 GMT
That's because of how log4net configures itself. When the repository finds a reference to a
file appender in a logger that it is creating, it will automatically ask its LockingModel
to create that file.  Even if your program has no intent on writing to that file log4net will
still create it as soon as it knows that you might write to it. I managed to find two ways
to accomplish what you want.




Create a new locking model and use that as your locking model:


public class MyLock : log4net.Appender.FileAppender.MinimalLock


      public override Stream AcquireLock()


            if (CurrentAppender.Threshold == log4net.Core.Level.Off)

                  return null;

            return base.AcquireLock();




Now in the config file, set the threshold to start out as: <threshold value="OFF" />
and make sure you set this new LockingModel as you model: <lockingModel type="Namespace.MyLock"
/>. Now when your locking model is called to create the file, if the threshold is set to
OFF, it will refuse. This will cause an internal exception (no way around it) but I see no
reason to believe this is an invalid method.




If in the config file you specify an empty string as the file name (<file value=""/>),
when log4net configures itself with that appender it will throw an exception to itself and
give up on creating any file for that appender, but importantly, it WILL create the appender
anyway.  So if you do that then the first time that you want to log to it you can specify
a file like this:


public void directAppenderToFile(string appender, string path)


      log4net.Appender.IAppender[] appenders = log4net.LogManager.GetRepository().GetAppenders();


      for (int i = 0; i < appenders.Length; ++i)


            log4net.Appender.FileAppender curAppender = appenders[i] as log4net.Appender.FileAppender;


            if (curAppender != null && curAppender.Name == appender)


                  curAppender.File = path;






I personally prefer the first method, but it's up to you to decide which one works best for


Happy Logging,

John VanderKolk 

From: Radovan Raszka [mailto:raszka@hasam.cz] 
Sent: Friday, August 03, 2007 5:27 PM
To: Log4NET User
Subject: RE: Disable/enable appender for all loggers


Thanks for proposal to John and Ron, it works well.

But when I tried the reverse strategy (set Threshold to OFF in config file and change to DEBUG
when needed), I noticed that empty log file (Service.log in my configuration) is created (file
size = 0 bytes).

Can this feature be disabled?


I think it would be great to add some samples of programatic configuration into SDK documentation
- current documentation is completely out of any example.



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Od: Ron Grabowski [mailto:rongrabowski@yahoo.com]
Odesláno: pá 3.8.2007 4:51
Komu: Log4NET User
Předmět: Re: Disable/enable appender for all loggers

Instead of removing the appender you could just set its threshold to OFF then when you want
to enable it again you can set it back to DEBUG:

// untested
public static void SetThreshold(string appenderName, Level threshold)
    foreach (AppenderSkeleton appender in LogManager.GetRepository().GetAppenders())
        if (appender.Name == appenderName)
            appender.Threshold = threshold;

----- Original Message ----

From: Radovan Raszka <raszka@hasam.cz>

To: log4net-user@logging.apache.org

Sent: Friday, July 27, 2007 2:23:05 AM

Subject: Disable/enable appender for all loggers

Disable/enable appender for all loggers           Hello, 

I am using three appenders in my log4net configuration (see bellow). But I need programatically
disable and reenable RollingFile appender at certain situations. Is there any simple solution?
I tried to use programatic configuration only.

  My config: 


                <appender name="Console" type="log4net.Appender.ConsoleAppender"> 

                        <layout type="log4net.Layout.PatternLayout"> 

                                <!-- Pattern to output the caller's file name and line
number --> 

                                <conversionPattern value="%date{HH:mm:ss,fff} %5level [%thread]
%message%n" /> 


                        <Threshold value="DEBUG" /> 


                  <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">

                        <appendToFile value="true" /> 

                        <file value="Service.log" /> 

                        <layout type="log4net.Layout.PatternLayout"> 

                                <conversionPattern value="%date{dd-MM-yyyy HH:mm:ss,fff}
%5level [%2thread] %message (%logger{1}:%line)%n" />


                        <rollingStyle value="Date" /> 

                        <Threshold value="DEBUG" /> 


                  <appender name="EvLog" type="log4net.Appender.EventLogAppender"> 

                        <ApplicationName value="IPserver" /> 

                        <layout type="log4net.Layout.PatternLayout"> 

                                <conversionPattern value="[%thread] %message (%logger{1})"


                        <Threshold value="INFO" /> 



                        <level value="DEBUG" /> 

                        <appender-ref ref="RollingFile" /> 

                        <appender-ref ref="Console" /> 

                        <appender-ref ref="EvLog" /> 



  I tried to complete rewrite this config into C# code:

  private readonly log4net.Appender.ConsoleAppender AppConsole; 

private readonly log4net.Appender.RollingFileAppender AppFile; 

private readonly log4net.Appender.EventLogAppender AppEvlog; 

private log4net.Repository.Hierarchy.RootLogger rootLog; 

//XmlConfigurator.Configure(new System.IO.FileInfo(IPserverCore.IPserver.GetAppPath() + "log4net.config"));

//xml configurator replaced by code 

AppConsole = new log4net.Appender.ConsoleAppender(); 

AppConsole.Layout = new log4net.Layout.PatternLayout("%date{HH:mm:ss,fff} %5level [%thread]

AppConsole.Threshold = log4net.Core.Level.Debug;

  AppFile = new log4net.Appender.RollingFileAppender(); 

AppFile.AppendToFile = true; 

AppFile.Layout = new log4net.Layout.PatternLayout("%date{dd-MM-yyyy HH:mm:ss,fff} %5level
[%2thread] %message (%logger{1}:%line)%n");

  AppFile.File = "Service.log"; 

AppFile.RollingStyle = log4net.Appender.RollingFileAppender.RollingMode.Date; 

AppFile.Threshold = log4net.Core.Level.Debug;

  AppEvlog = new log4net.Appender.EventLogAppender(); 

AppEvlog.Layout = new log4net.Layout.PatternLayout("[%thread] %message (%logger{1})"); 

AppEvlog.ApplicationName = "IPserver"; 

AppEvlog.Threshold = log4net.Core.Level.Info;

  rootLog = new log4net.Repository.Hierarchy.RootLogger(log4net.Core.Level.Info); 






log = LogManager.GetLogger(typeof(IPservice)); 

Log.Info("Start"); // no log produced here... 

rootLog.RemoveAppender(AppFile); // disable file logging 


But after rewriting aplication doesn't create any logs.... 

Did I miss some settings or am I complete wrong?

  Thanks for any suggestions 

Radovan Raszka

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