How do I configure a RollingFileAppender to roll by date and size with log4net?

Question

I am configure log4net to use a composite RollingFileAppender so that the current file is always named logfile.log and all subsequent files are named

Answer 1

We use the following (in Log4J):

<appender name="roller" class="org.apache.log4j.DailyRollingFileAppender">
    <param name="File" value="Applog.log"/>
    <param name="DatePattern" value="'.'yyyy-MM-dd"/>
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" value="[slf5s.start]%d{DATE}[slf5s.DATE]%n%p[slf5s.PRIORITY]%n%x[slf5s.NDC]%n%t[slf5s.THREAD]%n%c[slf5s.CATEGORY]%n%l[slf5s.LOCATION]%n%m[slf5s.MESSAGE]%n%n"/>
    </layout>
</appender>

This gives us Applog.log.yyyy-MM-dd files

Answer 2

Note that is this case the

            <maxSizeRollBackups value="10"/>

will be ignored.

See this answer to a similar log4net question

Answer 3

Try set this property to true:

preserveLogFileNameExtension value="true"

I believe this trick will help you! However, preserveLogFileNameExtension property needs the latest version of log4net, you can find it here: logging.apache.org/log4net/download.html

Answer 4

According to log4net RollingFileAppender source code:

protected string GetNextOutputFileName(string fileName)
{
    if (!m_staticLogFileName) 
    {
        fileName = fileName.Trim();

        if (m_rollDate)
        {
            fileName = fileName + m_now.ToString(m_datePattern, System.Globalization.DateTimeFormatInfo.InvariantInfo);
        }

        if (m_countDirection >= 0) 
        {
            fileName = fileName + '.' + m_curSizeRollBackups;
        }
    }

    return fileName;
}

So I'm guessing it's not possible to generate a log file with the name you need. I think it's something like logfileYYYY-MM-dd.n.log or similar.