I have a text that is more or less like this:
I10JOAO OF SILVAI202210I30 ...
where : I10 is a key to the Person class I20 is a key to another class so on ...
How to proceed using the FileHelpers library?
Personally, I would suggest that you pre-parse the file into a temporarily file containing multiple lines which have the |10, |20, |xx prefix then use the record selection techniques described in the Avanced - Multi Record Selection.