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.
1.
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.
2.
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;
curAppender.ActivateOptions();
}
}
}
I personally prefer the first method, but it's up to you to decide which one
works best for you.
Happy Logging,
John VanderKolk
From: Radovan Raszka [mailto:[EMAIL PROTECTED]
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.
Radovan
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Od: Ron Grabowski [mailto:[EMAIL PROTECTED]
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;
appender.ActivateOptions();
break;
}
}
}
----- Original Message ----
From: Radovan Raszka <[EMAIL PROTECTED]>
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:
<log4net>
<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" />
</layout>
<Threshold value="DEBUG" />
</appender>
<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" />
</layout>
<rollingStyle value="Date" />
<Threshold value="DEBUG" />
</appender>
<appender name="EvLog"
type="log4net.Appender.EventLogAppender">
<ApplicationName value="IPserver" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="[%thread] %message
(%logger{1})" />
</layout>
<Threshold value="INFO" />
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingFile" />
<appender-ref ref="Console" />
<appender-ref ref="EvLog" />
</root>
</log4net>
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] %message%n");
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);
rootLog.AddAppender(AppConsole);
rootLog.AddAppender(AppFile);
rootLog.AddAppender(AppEvlog);
//----
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
