Logging InnerException using Log4Net

Question

How do I log inner exception with Log4NET?

This is my current conversion pattern:

<conversionPattern value="%date [%appdomain] %-5level %logger [%property{NDC}] - %message%newline" />

Answer 1

Console and File Appenders automatically print the exception. The exception: message, stack trace, and all inner exceptions (again with stack trace) are logged on separate lines and do not follow the conversion pattern.

I am not even sure if you could configure log4net not to print it.

Update: It is possible to configure the appender to not print the stacktrace: Log4Net - Logging out the Exception stacktrace only for certain files

Answer 2

%exception

a formatted form of the exception object in the log entry, if the entry contains an exception; otherwise, this format expression adds nothing to the log entry

Reference: http://www.beefycode.com/post/Log4Net-Tutorial-pt-4-Layouts-and-Patterns.aspx

I believe your exception would contain the inner exception:

Edit: use the ILog.Error() method instead of ILog.ErrorFormat(). As per documentation, ErrorFormat() does not take an Exception object to include in the log event