log4net: writing a header to each rollover log segment

Question

I have a RollingFileAppender that rolls over the log file when it reaches a specified file size. This works great.

Is there a way to have log4net insert a header at the top of each newly created log file? Alternatively, is there a way to be notified by log4net when a roll over occurs so that I can write this header myself?

score 7 · Answer 1 · answered Jul 31 '10 at 11:02

7

This seems to work:

<layout type="log4net.Layout.PatternLayout">
     <header value="[Header]&#13;&#10;" />
     <conversionPattern value=" ... " />
</layout>

Though it will also write the header if you re-start the application.

answered Jul 31 '10 at 11:02

Stefan Egli

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But (from the docs) headers are added at the beginning of a logging session -- not necessarily the beginning of a newly rolled logfile. – hometoast Aug 05 '10 at 12:29
My tests showed that they are written in every file as well. I also looked at the source code and saw that this is the case. – Stefan Egli Aug 05 '10 at 22:24
Is any chance adding pattern strings to the header/footer? For instance `%logger` – sll Feb 21 '12 at 14:08
I think this is not supported, but this answer might help you: http://stackoverflow.com/a/2009318/106567 – Stefan Egli Feb 21 '12 at 15:23
How can we add %property{hostname} in footer log4net? @StefanEgli – Techgeeks1 May 04 '18 at 07:59
@Techgeeks1: have a look at the link in my previous comment – Stefan Egli May 07 '18 at 06:37
@StefanEgli can you help me in this? https://stackoverflow.com/questions/50228371/can-we-set-the-characters-limited-to-10-characters-in-log4net-property – Techgeeks1 May 08 '18 at 10:24

score 3 · Accepted Answer · answered Jul 30 '10 at 19:37

3

I think you may have to extend an appender or write your own appender for this.

answered Jul 30 '10 at 19:37

Skyler

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log4net: writing a header to each rollover log segment

2 Answers2