Mastering Microsoft Dynamics 365 Business Central

Working on AL coding guidelines

When creating your AL project (and your .al files), remember to always follow these main guidelines.

Inside a .al code file, the structure for all your objects must follow this sequence:

• Properties
• Object-specific constructs:
  • Table fields
  • Page layout
  • Actions
• Global variables:
  • Labels (old text constants)
  • Global variables
• Methods

Remember to always reference the AL objects by their object name and not by their ID. So, for example, this is how you reference a Record variable or a Page variable:

Vendor: Record Vendor;Page.RunModal(Page::"Customer Card", ...);

In an event subscriber object, this is how you should reference the publisher object:

[EventSubscriber(ObjectType::Codeunit, Codeunit::MyCodeunit ...