Personalized Community is here!
Quickly customize your community to find the content you seek.
Latest TechTalk Videos
Have questions on moving to the cloud? Visit the Dynamics 365 Migration Community today! Microsoft’s extensive network of Dynamics AX and Dynamics CRM experts can help.
2021 Release Wave 2Discover the latest updates and new features releasing from October 2021 through March 2022.
2021 release wave 2 plan
The FastTrack program is designed to help you accelerate your Dynamics 365 deployment with confidence.
FastTrack Community | FastTrack Program | Finance and Operations TechTalks | Customer Engagement TechTalks | Upcoming TechTalks | All TechTalks
There is a coding pattern that has been proliferating the X++ code base for years. It is not an X++ best practices – nor is it object oriented; yet it is used quite heavily (unfortunately). Consider a simple class hierarchy with an abstract base class and 3 derived classes. A typical implementation of a factory would be a static method on the base class, like this: (Please ignore the type of the parameter – it could be anything, I choose str for simplicity)
Now; the problems with this approach are many.
The coupling between the 4 classes spells trouble. If you try to modularize an application written like this, you will quickly realize that the pattern above is bad. You cannot have references from lower-level models (aka. assemblies/modules) to higher-level models. Yet; having a single factory method is valuable and a good practice.
SysExtension Framework to the rescue.
Consider you decorate the subclasses with an attribute, like depicted here:
Then you can rewrite the factory method to this:
The extension framework returns an instance of the right subclass automatically. It uses the attribute to determine which subclass instance to create. Quite simple – extraordinary powerful!
A few words of caution: There is a small performance impact on cold systems when using the SysExtension framework. In most cases you will not notice it; however – for performance critical paths, you should measure the impact of this change before going for it.
To learn more about the SysExtension framework see here.
Business Applications communities