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bcquality/microsoft/knowledge/events/prefix-temporary-record-event-parameters-with-temp.md
Jesper Schulz-Wedde faeacb2484 Add 12 general AL event-design articles to events domain 
Add 12 atomic knowledge articles under microsoft/knowledge/events covering
general AL event-design best practices: IsHandled initialization and OnAfter
preservation, appending new event parameters, position-based event naming,
reusing/extending events, avoiding per-iteration publishing, Temp-prefixing
temporary record parameters, unabbreviated parameter names, preferring the
this keyword over IncludeSender, avoiding loosely typed parameters, not
mutating existing event contracts, and not bypassing critical operations
with IsHandled. Each article ships a .good.al and .bad.al demonstration
sample (object IDs 50240-50296; not compiled by CI). Extend the
al-events-review leaf Worklist with one targeted check per new rule.

Additive only; no contract or wiring change (events leaf already wired).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-06-25 11:58:59 +02:00

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bc-version domain keywords technologies countries application-area
all
events
temporary-record
naming
event-parameters
buffer
temp-prefix
integration-event
conventions
al
w1
all

Prefix temporary record event parameters with Temp

Description

When a record passed to an event is a temporary record — an in-memory buffer not persisted to the database — its parameter name must start with Temp. The prefix is the only reliable signal a subscriber has that writes to the record will not reach the database and that the data is scoped to the current call. Without it, subscribers may treat buffer data as persisted: calling Modify or Insert expecting durability, or reading it as the authoritative table, which leads to silent data loss and confusing behaviour. The temporary keyword sits on the variable declaration and is not visible at the subscriber, so the name has to carry the meaning.

Best Practice

Name temporary record parameters with a Temp prefix, for example var TempSalesLineBuffer: Record "Sales Line" temporary, so every subscriber sees immediately that the record is an in-memory buffer and treats writes accordingly.

See sample: prefix-temporary-record-event-parameters-with-temp.good.al.

Anti Pattern

A temporary record parameter named without the Temp prefix (var SalesLineBuffer: Record "Sales Line" temporary), so subscribers cannot tell the record is non-persistent and may rely on writes that are silently discarded. Detection: an event parameter declared temporary whose name does not start with Temp.

See sample: prefix-temporary-record-event-parameters-with-temp.bad.al.