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AX / D365FO – Extending the InventSum Table Methods in D365FO: Using Chain of Command Instead of Event Handlers

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Dynamics 365 ERP - Development

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Nov 17, 2024

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  • Developers in Dynamics 365 for Finance and Operations often need to customize standard functionalities for specific business requirements, such as adding custom logic during insert or update operations of tables like InventSum.
  • Event handlers are not applicable to table methods like insert() and update() in D365FO due to the way these methods are implemented within the kernel.
  • The Chain of Command (CoC) pattern is recommended to extend the functionality of table methods, allowing developers to wrap existing methods and add custom code before or after execution without modifying the base code.
  • Benefits of using CoC include isolation of custom code, simplifying future upgrades, and providing control over custom logic execution.
  • Steps to extend the insert() and update() methods of InventSum using CoC involve creating a new class, decorating it with the ExtensionOf attribute, and implementing custom logic before and after the standard methods.
  • Important considerations include preserving standard functionality, matching method signatures, and using public instance methods.
  • Alternatives to CoC include Data Event Handlers (with limited support) and Business Events for triggering external processes.
  • In conclusion, the Chain of Command pattern is a robust and supported method to extend table methods in D365FO, allowing for maintainable customizations compatible with future updates.

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