Send email alerts from Nlog for specific exceptions

Question

I am working on configuring NLog configuration which works perfectly for logging into text files. Now on the top of this I want to set a conditional target as Mail which should get fired only for a specific set of exceptions. For example - if there is a PaymentFailedException , CardExpiredException then the NLog should target Mail . I have checked the NLog documentation but I could not find any way to set it for specific set of exceptions. However, NLog allows for setting target as Mail for exception levels.

Answer 1

You could configure use the <when> for this.

eg

<logger name="*" writeTo="myMailTarget">
  <filters>
    <when condition="not contains('${exception:format=type}', 'PaymentFailedException") action="Ignore" />
  </filters>
</logger> 

See filtering log messages and <when> docs