To continue my series about exception handling in NAV, this time I’ll discuss how to gain insight into exceptions in NAV. As I mentioned already, the GETLASTERROROBJECT function gives you an instance of System.Exception, actually of a class descending from it, which allows you to get more information about the context of the error that has just happened.
In my last post I have introduced the GETLASTERROROBJECT function that returns you the instance of the System.Exception class, representing the actual exception that has happened.
To properly handle exceptions in an unambiguous way, you must use the exception type, not its name, so it is important to get the actual System.Type representing the exception type.
Sounds easy, but it’s not quite so.
You may love C/AL as a language, but there is an area in it that you must just hate. It’s the error handling. Plainly put, and being actually quite positive about it, in NAV, error handling just sucks. If an error happens, it happens. You have only one possibility to actually capture the error, and it’s the IF CODEUNIT.RUN construct, and it’s limited because you can do it only once per transaction, and if you want to do it twice, you must COMMIT your transaction first.
But still, capturing an error is one thing; actually handling it is quite a different thing altogether.