How to specify common application data folder for log4net?

Question

I want log4net to write log files (using RollingFileAppender) to a subfolder of the common application data folder (e.g. C:\\Documents and Settings\\All Users\\Application D

Answer 1

Now (in 2018 FEB) as per log4net version 2.0.8.0.

You can use without any converter to get Environment Variables as follows.

Refer: log4net.Util.PatternString class documentation for more details.