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Report📌 Event Subscribers in Business Central — Your Secret Weapon for Clean Customizations 💥
Need to add custom logic to standard Business Central processes without modifying the base code?
1.Don’t customize directly.
2.Don’t hack the base application.
3.Just use Event Subscribers.
🎯 What are Event Subscribers?
In Business Central, Event Subscribers allow you to “hook” into standard application logic using AL extensions, so you can run custom code before or after standard functions — without altering the core application.
They support:
• Codeunit events
• Table triggers
• Page triggers
• System triggers like #OnBeforeValidateEvent, #OnAfterInsertEvent, etc.
Need to add custom logic to standard Business Central processes without modifying the base code?
1.Don’t customize directly.
2.Don’t hack the base application.
3.Just use Event Subscribers.
🎯 What are Event Subscribers?
In Business Central, Event Subscribers allow you to “hook” into standard application logic using AL extensions, so you can run custom code before or after standard functions — without altering the core application.
They support:
• Codeunit events
• Table triggers
• Page triggers
• System triggers like #OnBeforeValidateEvent, #OnAfterInsertEvent, etc.
✅ Why Use Event Subscribers?
🔹 Clean & Modular Logic
🔹 Microsoft-endorsed customization method
🔹 Upgrade-safe and easy to manage
🔹 Applies across tables, codeunits, and pages
🧠 Best Practices
✔️ Name your procedures clearly
➡️ e.g. #SalesHeader_OnBeforePost_CustomValidation
✔️ Keep logic small and modular
➡️ Break complex logic into local procedures
✔️ Use the parameters carefully
➡️ Know when to pass #IsHandled and when to use Rec by var
✔️ Handle errors gracefully
➡️ Wrap risky logic in try...except blocks
🔍 Bonus Tip: How to Discover Events?
Use Shift+ALT+E in VS Code to search for EventPublisher in base app symbols.
📘 Want more examples like this in future posts?
Just drop a quick 'Yes' in the comments
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