By Default we have the following values for following properties of a RollingFileAppender

staticLogFileName = true
countDirection = –1
rollingStyle = Composite
maxSizeRollBackups = 0 // be careful with this
maximumFileSize = “10MB”
datePattern = '.yyyy-MM-dd'

The Apache Logging Services Project creates and maintains open-source software related to the logging of application behavior and released at no charge to the public. Apache Log4j Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j 1.x. assembly: log4net.Config.XmlConfigurator(ConfigFile = 'log4net.config', Watch = true) Ninject bonus tip. Even if you're using Ninject.Extensions.Logging, you still have to configure log4net after the tutorials above. Unfortunately, it doesn't magically work out of the box. This should be enough to get you started with Log4Net in C#. Tips on using log4net RollingFileAppender. RollingStyle can be either Date, Size or Composite. The default setting Composite, uses a combination of Size and Date settings. Thus if you have the datePattern set to “.yyyy-MM-dd” and maxSizeRollBackups set to 10, themn it will maintain 10 log backups for each day. I use Utilities for my logging via log4net. All is fine with the world if I use a separate config file for log4net (aka log4net.config) - no issues. However, IT staff finds it challenging to tweak two.config files (MainApp.exe.config and log4net.config). So, I'm trying to add my log4net config settings into my app.config file. Not having any luck. For full details see the SDK Reference entry: log4net.Appender.RollingFileAppender. The RollingFileAppender builds on the FileAppender and has the same options as that appender. The following example shows how to configure the RollingFileAppender to write to the file log.txt.

staticLogFileName indicates whether you need to keep writing (log) to the same file all the time. You will need to set it to false when using Date as the rolling style and you have large number of backups.

Optionally file.log.yyyy-mm-dd for current formated datePattern can by the currently logging file (or file.log.curSizeRollBackup (rollingStyle=Size) or even file.log.yyyy-mm-dd.curSizeRollBackup --- (rollingStyle=Composite)) This will make time based roll overs with a large number of backups much faster -- it won't have to rename all the backups!

Recommend to leave it at its default value “true”

Stages and resources for standards development. https://treenovo.amebaownd.com/posts/15827966.

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countDirection when its value is –1, then newest logfile backup will always be file.log.1. hence this would involve more number of file renaming.

By default newer files have lower numbers. (countDirection < 0) ie. log.1 is most recent, log.5 is the 5th backup, etc.. countDirection > 0 does the opposite ie. log.1 is the first backup made, log.5 is the 5th backup made, etc. For infinite backups use countDirection > 0 to reduce rollOver costs.

rollingStyle can be either Date, Size or Composite. the default setting Composite, uses a combination of Size and Date settings. Thus if you have the datePattern set to “.yyyy-MM-dd” and maxSizeRollBackups set to 10, themn it will maintain 10 log backups for each day.

If you have the DatePattern set to “.yyyy-MM-dd HH:mm” and maxSizeRollbackups = 10 then it will maintain 10 logfile backups per minute

Samples:

Rollingfileappender Log4net Configuration

This will create infinite file backups with the countdirection > 0 so that the newest file has the latest/greatest name i.e. log.5 for the newest backup (5th backup)

This is a Composite RollingFileAppender which keeps max of 10 1MB log backups every minute

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Posted on Tuesday, March 3, 2009 3:50 PM | Back to top

Active5 years, 6 months ago

I would like to create a log4net RollingFileAppender that creates a new file each time the program starts. It can roll if the file gets to big but must roll each time the application is started. The appender should not be added if another appender is configured in the configuration. In essence creating a default log configuration that can be overridden by changing the configuration file.

Ben GripkaBen Gripka

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After piecing together a number of other posts, I finally got this working. The implementation is in a static wrapper class. All you have to do is paste this code into your app, set the location to create the file, and call Log.Configure() when the application starts.

Ben GripkaBen Gripka

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Rollingfileappender Log4net Configuration

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Rollingfileappender Log4net Config Error

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