Appending date to filename when rolling by size

问题

I'd like to configure log4net to append the name to the filenames when rolling by size. I've only played around with the configuration section of log4net, not sure if I have to configure something in code for this.
This is what I have now:

<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
  <file value="C:\\rolling-log.txt" />
  <appendToFile value="true" />
  <datePattern value="_yyyy-MM-dd" />
  <maxSizeRollBackups value="10" />
  <maximumFileSize value="10KB" />
  <rollingStyle value="Size" />
  <staticLogFileName value="true" />
  <preserveLogFileNameExtension  value="true"/>
  <layout type="log4net.Layout.PatternLayout">
    <param name="ConversionPattern" value="%m%n" />
  </layout>
</appender>

I can only get the date in the filename if the rollingStyle is set to Date, but then it doesn't roll on size anymore.

What am I missing here?

回答1:

Change

<file value="C:\\rolling-log.txt" />

to

<file type="log4net.Util.PatternString" value="C:\\rolling-log-%date{yyy-MM-dd}.txt" />

(or whatever date pattern you prefer).

Caveat:

Unfortunately, the date specified in the filename is only evaluated upon configuration, meaning the same date will be used on each roll until log4net is reconfigured. I have not found a way to fix this.

来源：https://stackoverflow.com/questions/16858935/appending-date-to-filename-when-rolling-by-size