Nlog Error(message, exception) ignore exception - exception

Question

I have problem log exception only message is logged.
NLog config:
<target name="logfile"
xsi:type="File"
fileName="log.txt"
layout="${longdate} | ${machinename} | ${processid} | ${processname} | ${level} | ${logger} | |${message} | ${exception:format=tostring}" />
<logger name="*"
minlevel="Info"
writeTo="logfile" />
Usage:
private static Logger _logger = LogManager.GetCurrentClassLogger();
_logger.Error("my message", new Exception("my exception"));
Log output:
2014-04-24 18:17:29.0841 | PC_NAME | 6464 | APP_NAME.vshost | Error | AppName.ViewModel | my message |
Exception is ignore.
I found some thread but for me not work.

Answer 1

Nlog is using sepecial methods for logging exceptions which are using the <loglevel>Exception naming schema.
So in your case you need to use the ErrorException method in order to your exceptions get logged correctly:
private static Logger _logger = LogManager.GetCurrentClassLogger();
_logger.ErrorException("my message", new Exception("my exception"));

Answer 2

Actually, void Error(string message, Exception exception); is obsolete
You can use ILogger.Error(Exception, string) method like below
catch (Exception e)
{
Log.Error(e, "it happens");
}
and a little bit modified layout with ${onexception}. This will check is there an exception to be logged
<target name="logfile"
xsi:type="File"
fileName="log.txt"
layout="${longdate} | ${machinename} | ${processid} | ${processname} | ${level} | ${logger} | |${message} ${onexception:| ${exception:format=tostring}}" />
/>