Use of method chaining in Business Central

Problem: Method chaining is useful to structure common functionality. A Implementation in Business Central requires a lot of objects and therefor object IDs. This blocks many reuse scenarios.

Idea: The interface object type has no object ID. It is used to provide a subset of methods of an implementation codeunit. By chaining Interfaces and with just 2 Codeunits (One to define the starting point, the other for the chained methods) it becomes possible to implement complex method chaining structures.

DownloadMgt Module

Collect Files contained in TempBlobs in a zip file. Create textfiles on the fly. Download all files in a zip package.

DocInfo Module

Objects	Description
Codeunit DocInfo	Access to DocInfo functions
Codeunit DocInfoImpl	all interface implementations
multiple interfaces	used to structure and chain methods

Overview Available Method Chains

Sales

• DocInfo.From(HeaderRecord)
  • SalesAddress
    • SellToAddress
    • BillToAddress
    • ShipToAddress
  • RelatedTables
    • PaymentTerms
    • ShipmentMethod
    • SalespersonPurchaser

Purchase

• DocInfo.From(HeaderRecord)
  • PurchAddress
    • BuyFromAddress
    • PayToAddress
    • ShipToAddress
  • RelatedTables
    • PaymentTerms
    • ShipmentMethod
    • SalespersonPurchaser
• DocInfo.From(LineRecord)
  • Item
  • TrackingSpecification