Lookup item in Exception.Data-Dictionary from Exception provided together with the LogEvent. See also How to properly log exceptions.

Platforms Supported: All (Introduced with NLog 5.0)

${exceptiondata:item=String:format=String:BaseException=Boolean}

• Item - Item to lookup in Exception.Data
• Format - Format for conversion from object to string (@ means serialize object properties into Json-format)
• BaseException - Render innermost Exception from Exception.GetBaseException(). Boolean. Default: false