How to use X++ Delegates in Dynamics AX 2012

re: How to use X++ Delegates in Dynamics AX 2012

Steven — Tue, 13 Mar 2012 01:12:55 GMT

Hi,

How do I programatically attach to the "update" method on a table. I want to subscribe many instances of my class to this such that I can pickup then status changes within the table occur. Every example I've seen simply referes to delegates on a class, yet in the AOT I can add a event subscription statically - which is of no real use. I need to do this dynamically.

Thanks

re: How to use X++ Delegates in Dynamics AX 2012

Marcos Calderon M — Wed, 03 Aug 2011 18:05:57 GMT

Among the reasons delegates and events handlers have been introduced in AX2012 is to provide application developers with additional tools to reduce the need of customizations base on editing X++ source code in upper layers, however that implies application code should be designed and written in a such a way that the behavior exposed could be customized by event handlers subscribed to the delegates, passing as part of the contract the enough information and right abstractions (APIs) to make possible the behavior customization easy. Pre and Post event handlers have been introduced with the same reason in mind (Additional reference useful to read is: daxmusings.blogspot.com/.../ax-2012-models-events-part3-power-combo.html)

re: How to use X++ Delegates in Dynamics AX 2012

Tommy — Wed, 03 Aug 2011 13:16:52 GMT

@Curious: "delegates" are an essential part of an event driven architecture. This is great news for those who want to reuse business logic without overriding, replace, rewrite or shadow existing business logic. It enhances future maintenance of your business application making it even easier to add custom logic to existing logic.

re: How to use X++ Delegates in Dynamics AX 2012

Curious — Wed, 03 Aug 2011 05:10:01 GMT

Why was this change made, I'm trying to see the business logic?