我们遇到了问题，因为服务运行时目录为C:\Windows\System或C:\Windows\System32.因此，log4net.config必须位于您不希望的系统目录中，或者必须提供log4net.config文件的路径.

We had a problem because the services runtime directory is C:\Windows\System or C:\Windows\System32. Therefore the log4net.config has to be in your system dir which is not desirable or you have to provide the path to your log4net.config file.