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bcquality/microsoft/knowledge/reporting/report-output-in-a-loop-needs-one-client-download.md
demiliani 75f3863ae0 Add reporting review guidance and fixtures
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bc-version domain keywords technologies countries application-area
all
reporting
report
run
saveas
downloadfromstream
web-client
loop
zip
data-compression
al
w1
all

Report output in a loop needs one client download

Description

The Business Central Web client can deliver only one file per request. When AL generates or downloads a report file repeatedly in the same request, only the last file is delivered to the browser. Earlier report output is silently unavailable to the user even though every iteration ran.

Best Practice

Generate each report into a stream, add the streams to one archive, and call DownloadFromStream once after the loop. A direct report run or download inside a loop is valid only when the execution context does not use the Web client or the loop is guaranteed to execute at most once.

See sample: report-output-in-a-loop-needs-one-client-download.good.al.

Anti Pattern

Call Report.Run, Report.RunModal, or DownloadFromStream repeatedly in a loop initiated by one Web client action and expect every generated file to reach the browser. The client receives only the last download.

See sample: report-output-in-a-loop-needs-one-client-download.bad.al.

References

File handling in Business Central — https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/devenv-file-handling

Data Compression codeunit — https://learn.microsoft.com/dynamics365/business-central/application/system-application/codeunit/system.io.data-compression