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• Log4net Rolling File Appender Config
• Log4net Fileappender
• Log4net Rolling File Appender Configuration
• Log4net Datepattern

I would like to have files named for example:

I have a rolling file appender and every night it rolls the file. However, when it rolls it, the new file only has one log entry. It seems that file is not appending log entries anymore. Log4Net appends the datepattern onto the file value, so you want the file extension on the former. – Craig Walker Oct 28 '11 at 5:04 Since I want to monitor a predictable log file name for the current day, I use for file value = logs/server.log. Then for datePattern value, I add a period before yyyy. If the file cannot be opened for writing when a message is logged then the message will be discarded by this appender. When rolling a backup file necessitates deleting an older backup file the file to be deleted is moved to a temporary name before being deleted. CAUTION A maximum number of backup files when rolling on date/time boundaries is not supported. Namespace: log4net.Appender. Assembly: log4net (in log4net.dll) See Also. For full details see the SDK Reference entry: log4net.Appender.FileAppender. The following example shows how to configure the FileAppender to write messages to a file. The file specified is log-file.txt. The file will be appended to rather than overwritten each time the logging process starts.

dd.mm.yyyy.log

How is this possible with log4net?

JL.JL.

8 Answers

In your Log4net config file, use the following parameter with the RollingFileAppender:

MunMunPhilipp MNonkichiNonkichi

For a RollingLogFileAppender you also need these elements and values:

Using Log4Net 1.2.13 we use the following configuration settings to allow date time in the file name.

<file type='log4net.Util.PatternString' value='E:/logname-%utcdate{yyyy-MM-dd}.txt' />

Which will provide files in the following convention: logname-2015-04-17.txt

With this it's usually best to have the following to ensure you're holding 1 log per day.

If size of file is a concern the following allows 500 files of 5MB in size until a new day spawns. CountDirection allows Ascending or Descending numbering of files which are no longer current.

I ended up using (note the '.log' filename and the single quotes around 'myfilename_'):

This gives me:

Log4net Rolling File Appender Config

I've tried all the answers, but there was always something missing and not functioning as expected for me.

Then I experimented a bit with the hints given in each answer and was successful with the following setting: Happy birthday to you song.

The issue with other combinations of parameters was that the latest file didn't have the time pattern, or that the time pattern was appended as .log20171215 which created a new file time (and a new file type!) each day - or both issues appeared.

Now with this setting you are getting files like this one:

LOG4NET_Sample_Activity-20171215.log

which is what I wanted.

To summarize:

• Don't put the date pattern in the <file value=.. attribute, just define it in the datePattern.

• Make sure you have the preserveLogFileNameExtensionvalue attribute set to true.

• Make sure you have the staticLogFileNamevalue set to false.

• Set the rollingStyle attribute value to Date.

Log4net Fileappender

MattMatt

Log4net Rolling File Appender Configuration

FouratFourat

The extended configuration section in a previous response with

listed works but I did not have to use

. I think the RollingAppender must (logically) ignore that setting since by definition the file gets rebuilt each day when the application restarts/reused. Perhaps it does matter for immediate rollover EVERY time the application starts.

Log4net Datepattern

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