How to specify log file path using folder locations in Windows with log4net xml configurator?

问题

In my app.config I put

<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
  <file value="%programdata%/log-file.txt"/>

but it didn't work. Any ideas?

回答1:

The log4net syntax for expanding environment variables is "${Variable}" e.g.

<file value="${LOCALAPPDATA}\GojiSoft\GojiLog\log.txt" />

回答2:

Resurrecting an old thread here, but I encountered the same issue and thought I'd share.

${PROGRAMDATA}, as discussed in the comment thread of the other answer, didn't work for me (same as for OP). However, I saw a comment somewhere about it being case sensitive. Tried ${ProgramData} and sure enough, it worked fine.

回答3:

Use ${APPDATA} instead of ${LOCALAPPDATA}

来源：https://stackoverflow.com/questions/3338055/how-to-specify-log-file-path-using-folder-locations-in-windows-with-log4net-xml