Log4net rolling daily filename with date in the file name

I would like to have files named for example:

dd.mm.yyyy.log

How is this possible with log4net?

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最佳答案

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

<param name="DatePattern" value="dd.MM.yyyy'.log'" />
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For a RollingLogFileAppender you also need these elements and values:

<rollingStyle value="Date" />
<staticLogFileName value="false" />
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<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
<file value="logs\" />
<datePattern value="dd.MM.yyyy'.log'" />
<staticLogFileName value="false" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="5MB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
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The extended configuration section in a previous response with 

 ...
...
<rollingStyle value="Composite" />
...
...

listed works but I did not have to use 

<staticLogFileName value="false" />

. 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.

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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.

<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />

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 CountDirection allows Ascending or Descending numbering of files which are no longer current.

 <maxSizeRollBackups value="500" />
<maximumFileSize value="5MB" />
<rollingStyle value="Composite" />
<datePattern value="yyyyMMdd" />
<CountDirection value="1"/>
<staticLogFileName value="true" />
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I ended up using (note the '.log' filename and the single quotes around 'myfilename_'):

  <rollingStyle value="Date" />
<datePattern value="'myfilename_'yyyy-MM-dd"/>
<preserveLogFileNameExtension value="true" />
<staticLogFileName value="false" />
<file type="log4net.Util.PatternString" value="c:\\Logs\\.log" />

This gives me:

myfilename_2015-09-22.log
myfilename_2015-09-23.log
.
.
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To preserve file extension:

<log4net>
<root>
<level value="DEBUG"/>
<appender-ref ref="RollingLogFileAppender"/>
</root>
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="D:\\LogFolder\\%date{yyyyMM}\\SchT.log" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<maximumFileSize value="30MB" />
<staticLogFileName value="true" />
<preserveLogFileNameExtension value="true"/>
<datePattern value="ddMMyyyy" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
</log4net>
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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:

<appender name="RollingActivityLog" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="C:\temp\LOG4NET_Sample_Activity.log" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<staticLogFileName value="false" />
<preserveLogFileNameExtension value="true" />
<datePattern value="-yyyyMMdd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %-5level - %message%newline" />
</layout>
</appender>

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 preserveLogFileNameExtension value attribute set to true.

  • Make sure you have the staticLogFileName value set to false.

  • Set the rollingStyle attribute value to Date.

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I moved configuration to code to enable easy modification from CI using system variable. I used this code for file name and result is 'Log_03-23-2020.log'

            log4net.Repository.ILoggerRepository repository = LogManager.GetRepository(Assembly.GetEntryAssembly());
Hierarchy hierarchy = (Hierarchy)repository;
PatternLayout patternLayout = new PatternLayout();
patternLayout.ConversionPattern = "%date %level - %message%newline%exception";
patternLayout.ActivateOptions();


RollingFileAppender roller = new RollingFileAppender();
roller.AppendToFile = true;
roller.File = "Log_";
roller.DatePattern = "MM-dd-yyyy'.log'";
roller.Layout = patternLayout;
roller.MaxFileSize = 1024*1024*10;
roller.MaxSizeRollBackups = 10;
roller.StaticLogFileName = false;
roller.RollingStyle = RollingFileAppender.RollingMode.Composite;
roller.ActivateOptions();
hierarchy.Root.AddAppender(roller);
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Your answer is that the way to changing "rollingStyle value" to "Date". The others things are look like fine.

<rollingStyle value="Date" />

The trick is hidden those four definitions:

 ...
<file value="logs\" />
<datePattern value="dd.MM.yyyy'.log'" />
<staticLogFileName value="false" />
<rollingStyle value="Date" />
...

This is my log4net configuration:

    <?xml version="1.0" encoding="utf-8" ?>
<configuration>
<!-- Log4Net -->
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<root>
<level value="ALL" />
<appender-ref ref="RollingFileAppender" />
</root>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="logs\log_" />
<rollingStyle value="Date" />
<datePattern value="yyyy_MM_dd'.txt'"/>
<staticLogFileName value="false" />
<appendToFile value="true" />
<maxSizeRollBackups value="50" />
<maximumFileSize value="10MB" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level - %message%newline%exception" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="INFO" />
<levelMax value="ERROR" />
<levelMin value="DEBUG" />
</filter>
</appender>
</log4net>
<!-- Log4Net -->
</configuration>
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for me, the solution was to modify the datePattern value like this:

<datePattern value="'-'yyyy-MM-dd'.log'" />

Here is my appender:

<appender name="testAppender" type="log4net.Appender.RollingFileAppender">
<file  type="log4net.Util.PatternString" value="ApplicationLog" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<staticLogFileName value="false" />
<preserveLogFileNameExtension value="true" />
<datePattern value="'-'yyyy-MM-dd'.log'" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="100MB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %-5level - %message%newline" />
</layout>

My log file will be named: ApplicationLog-2022-11-04.log


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