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51 lines
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93 KiB
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<!doctype html><html lang=en class=no-js><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=generator content="Hugo 0.95.0"><meta name=robots content="index, follow"><link rel="shortcut icon" href=/favicons/favicon.ico><link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180><link rel=icon type=image/png href=/favicons/favicon-16x16.png sizes=16x16><link rel=icon type=image/png href=/favicons/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/favicons/android-36x36.png sizes=36x36><link rel=icon type=image/png href=/favicons/android-48x48.png sizes=48x48><link rel=icon type=image/png href=/favicons/android-72x72.png sizes=72x72><link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96><link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144><link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192><title>Singleton Codeunit | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="By Bogdana Botez at Microsoft Development Center Copenhagen
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Problem: In some situations, global state needs to be preserved at runtime throughout a …"><meta property="og:title" content="Singleton Codeunit"><meta property="og:description" content="By Bogdana Botez at Microsoft Development Center Copenhagen
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Problem: In some situations, global state needs to be preserved at runtime throughout a session.
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There are functionality areas in NAV where centralized application management code is needed, like for example managing permissions, notifications, the debugger etc. State needs to be preserved across calls to the management codeunit.
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For example:
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The debugger needs to remember the session which is being debugged The permission manager has a testability function, where it can be set to emulate that it’s running as a SaaS (Software As A Service – the cloud) platform, even when the tests run in a “on-premise” local lab."><meta property="og:type" content="article"><meta property="og:url" content="https://alguidelines.dev/docs/navpatterns/patterns/singleton/singleton-codeunit/"><meta property="og:image" content="https://alguidelines.dev/images/og-image-fission.png"><meta property="article:section" content="docs"><meta property="article:modified_time" content="2022-02-24T14:45:35+01:00"><meta property="og:site_name" content="alguidelines.dev - Business Central Design Patterns"><meta itemprop=name content="Singleton Codeunit"><meta itemprop=description content="By Bogdana Botez at Microsoft Development Center Copenhagen
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Problem: In some situations, global state needs to be preserved at runtime throughout a session.
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There are functionality areas in NAV where centralized application management code is needed, like for example managing permissions, notifications, the debugger etc. State needs to be preserved across calls to the management codeunit.
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For example:
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The debugger needs to remember the session which is being debugged The permission manager has a testability function, where it can be set to emulate that it’s running as a SaaS (Software As A Service – the cloud) platform, even when the tests run in a “on-premise” local lab."><meta itemprop=dateModified content="2022-02-24T14:45:35+01:00"><meta itemprop=wordCount content="826"><meta itemprop=image content="https://alguidelines.dev/images/og-image-fission.png"><meta itemprop=keywords content="C/AL,"><meta name=twitter:card content="summary_large_image"><meta name=twitter:image content="https://alguidelines.dev/images/og-image-fission.png"><meta name=twitter:title content="Singleton Codeunit"><meta name=twitter:description content="By Bogdana Botez at Microsoft Development Center Copenhagen
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Problem: In some situations, global state needs to be preserved at runtime throughout a session.
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There are functionality areas in NAV where centralized application management code is needed, like for example managing permissions, notifications, the debugger etc. State needs to be preserved across calls to the management codeunit.
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For example:
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The debugger needs to remember the session which is being debugged The permission manager has a testability function, where it can be set to emulate that it’s running as a SaaS (Software As A Service – the cloud) platform, even when the tests run in a “on-premise” local lab."><link rel=preload href=/scss/main.min.84a617ff0c0265eb62b5cd2929c572f4ed37dc4907d0cf068be4eb2974f6d60f.css as=style><link href=/scss/main.min.84a617ff0c0265eb62b5cd2929c572f4ed37dc4907d0cf068be4eb2974f6d60f.css rel=stylesheet integrity><script src=https://code.jquery.com/jquery-3.6.0.min.js integrity=sha384-vtXRMe3mGCbOeY7l30aIg8H9p3GdeSe4IFlP6G8JMa7o7lXvnz3GFKzPxzJdPfGK crossorigin=anonymous></script>
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<span class="font-weight-bold show-desktop">alguidelines.dev - Business Central Design Patterns</span>
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<span class="font-weight-bold show-mobile-inline">alguidelines.dev</span></a><div class="td-navbar-nav-scroll ml-md-auto" id=main_navbar><ul class="navbar-nav mt-2 mt-lg-0"><li class="nav-item mr-4 mb-2 mb-lg-0"><a class=nav-link href=/docs/><i class="fas fa-book"></i><span>Docs</span></a></li><li class="nav-item mr-4 mb-2 mb-lg-0"><a class=nav-link href=https://github.com/microsoft/alguidelines/discussions/ target=_blank><i class="fas fa-comments"></i><span>Discussions</span></a></li><li class="nav-item mr-4 mb-2 mb-lg-0"><a class=nav-link href=https://github.com/microsoft/alguidelines target=_blank><i class="fab fa-github"></i><span>GitHub</span></a></li><li class="nav-item mr-4 mb-2 mb-lg-0"><a class=nav-link href=https://discord.gg/4wbfNv3 target=_blank><i class="fab fa-discord"></i><span>Discord</span></a></li></ul></div><div class="navbar-nav d-none d-lg-block"><input type=search class="form-control td-search-input" placeholder=" Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.f0b446a082072e23a2b0462640a59a84.json data-offline-search-base-href=/ data-offline-search-max-results=10></div></nav></header><div class="container-fluid td-outer"><div class=td-main><div class="row flex-xl-nowrap"><aside class="col-12 col-md-3 col-xl-2 td-sidebar d-print-none"><div id=td-sidebar-menu class=td-sidebar__inner><div id=content-mobile><form class="td-sidebar__search d-flex align-items-center"><input type=search class="form-control td-search-input" placeholder=" Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.f0b446a082072e23a2b0462640a59a84.json data-offline-search-base-href=/ data-offline-search-max-results=10>
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<button class="btn btn-link td-sidebar__toggle d-md-none p-0 ml-3 fas fa-bars" type=button data-toggle=collapse data-target=#td-section-nav aria-controls=td-docs-nav aria-expanded=false aria-label="Toggle section navigation"></button></form></div><div id=content-desktop></div><nav class="collapse td-sidebar-nav" id=td-section-nav><ul class="td-sidebar-nav__section pr-md-3 ul-0"><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docs-li><a href=/docs/ title="AL Guidelines" class="align-left pl-0 td-sidebar-link td-sidebar-link__section tree-root" id=m-docs><span>Docs</span></a><ul class=ul-1><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docspatterns-li><a href=/docs/patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docspatterns><span>Design Patterns</span></a><ul class="ul-2 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsapi-register-fieldset-li><a href=/docs/patterns/api-register-fieldset/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsapi-register-fieldset><span>API Register Fieldset</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsapi-delegate-operation-li><a href=/docs/patterns/api-delegate-operation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsapi-delegate-operation><span>Delegate API Operation</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsevent-bridge-pattern-li><a href=/docs/patterns/event-bridge-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsevent-bridge-pattern><span>Event Bridge</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsfacade-pattern-li><a href=/docs/patterns/facade-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsfacade-pattern><span>Façade</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsgeneric-method-pattern-li><a href=/docs/patterns/generic-method-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsgeneric-method-pattern><span>Generic Method</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsno-series-li><a href=/docs/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsno-series><span>No. Series</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li><a href=/docs/bestpractices/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsbestpractices><span>Best Practices</span></a><ul class="ul-2 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesapi-page-li><a href=/docs/bestpractices/api-page/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesapi-page><span>API Page / Query</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesbegin-as-an-afterword-li><a href=/docs/bestpractices/begin-as-an-afterword/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesbegin-as-an-afterword><span>begin as an afterword</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesbegin-end-li><a href=/docs/bestpractices/begin-end/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesbegin-end><span>Begin-End - Compound Only</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesbinary-operator-line-start-li><a href=/docs/bestpractices/binary-operator-line-start/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesbinary-operator-line-start><span>Binary Operator to Start Line</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticescase-actions-li><a href=/docs/bestpractices/case-actions/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticescase-actions><span>CASE Action on next line</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticescomments-spacing-li><a href=/docs/bestpractices/comments-spacing/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticescomments-spacing><span>Comment Spacing</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticescustomtelemetry-li><a href=/docs/bestpractices/customtelemetry/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticescustomtelemetry><span>Custom Telemetry</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesdeleteall-li><a href=/docs/bestpractices/deleteall/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesdeleteall><span>DeleteAll</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesend-else-pair-li><a href=/docs/bestpractices/end-else-pair/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesend-else-pair><span>end else pair</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticeskeyword-pairs-indentation-li><a href=/docs/bestpractices/keyword-pairs-indentation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticeskeyword-pairs-indentation><span>Keyword Pairs - Indentation</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesline-start-keywords-li><a href=/docs/bestpractices/line-start-keywords/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesline-start-keywords><span>Line Start Keywords</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticeslonely-repeat-li><a href=/docs/bestpractices/lonely-repeat/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticeslonely-repeat><span>Lonely Repeat</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesnamed-invocations-li><a href=/docs/bestpractices/named-invocations/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesnamed-invocations><span>Named Invocations</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesone-statement-per-line-li><a href=/docs/bestpractices/one-statement-per-line/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesone-statement-per-line><span>One Statement per Line</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesseparate-if-and-else-li><a href=/docs/bestpractices/separate-if-and-else/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesseparate-if-and-else><span>Seperate if and else</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesspacing-binary-operators-li><a href=/docs/bestpractices/spacing-binary-operators/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesspacing-binary-operators><span>Spacing Binary Operators</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticessubscribercodeunits-li><a href=/docs/bestpractices/subscribercodeunits/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticessubscribercodeunits><span>Subscriber Codeunits</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticessuggested-abbreviations-li><a href=/docs/bestpractices/suggested-abbreviations/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticessuggested-abbreviations><span>Suggested Abbreviations</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesunnecessary-else-li><a href=/docs/bestpractices/unnecessary-else/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesunnecessary-else><span>Unnecessary else</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesunnecessary-truefalse-li><a href=/docs/bestpractices/unnecessary-truefalse/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesunnecessary-truefalse><span>Unnecessary true/false</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesvariable-naming-li><a href=/docs/bestpractices/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariable-naming><span>Variable Naming</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesvariables-declarations-order-li><a href=/docs/bestpractices/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariables-declarations-order><span>Variables Declarations Order</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li><a href=/docs/navpatterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns><span>NAV Patterns Archive</span></a><ul class="ul-2 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatternspatterns-li><a href=/docs/navpatterns/patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatterns><span>1. Patterns</span></a><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsactivity-log-li><a href=/docs/navpatterns/patterns/activity-log/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsactivity-log><span>Activity Logs</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsargument-table-li><a href=/docs/navpatterns/patterns/argument-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsargument-table><span>Argument Table</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternsblocked-entity-li><a href=/docs/navpatterns/patterns/blocked-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternsblocked-entity><span>Blocked Entity</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity-li><a href=/docs/navpatterns/patterns/blocked-entity/data-driven-blocked-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity><span>Data Driven Blocked Entity</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscached-web-service-calls-li><a href=/docs/navpatterns/patterns/cached-web-service-calls/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscached-web-service-calls><span>Cached Web Server Calls</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsconditional-cascading-update-li><a href=/docs/navpatterns/patterns/conditional-cascading-update/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsconditional-cascading-update><span>Conditional Cascading Update</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscopy-document-li><a href=/docs/navpatterns/patterns/copy-document/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscopy-document><span>Copy Document</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscreate-data-from-templates-li><a href=/docs/navpatterns/patterns/create-data-from-templates/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscreate-data-from-templates><span>Create Data from Templates</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscreate-urls-to-nav-clients-li><a href=/docs/navpatterns/patterns/create-urls-to-nav-clients/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscreate-urls-to-nav-clients><span>Create URLs to NAV Clients</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscreating-custom-charts-li><a href=/docs/navpatterns/patterns/creating-custom-charts/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscreating-custom-charts><span>Creating Custom Charts</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscross-session-events-li><a href=/docs/navpatterns/patterns/cross-session-events/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscross-session-events><span>Cross Session Events</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscurrently-active-record-li><a href=/docs/navpatterns/patterns/currently-active-record/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscurrently-active-record><span>Currently Active Record</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsdata-migration-facade-li><a href=/docs/navpatterns/patterns/data-migration-facade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsdata-migration-facade><span>Data Migration Façade</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsdiscovery-event-li><a href=/docs/navpatterns/patterns/discovery-event/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsdiscovery-event><span>Discovery Event</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsdocument-li><a href=/docs/navpatterns/patterns/document/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsdocument><span>Document</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternseasy-update-of-setup-or-supplementary-information-li><a href=/docs/navpatterns/patterns/easy-update-of-setup-or-supplementary-information/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternseasy-update-of-setup-or-supplementary-information><span>Easy Update Of Setup Or Supplementary Information</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternserror-message-processing-li><a href=/docs/navpatterns/patterns/error-message-processing/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternserror-message-processing><span>Error Message Processing</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsextending-the-role-center-headlines-li><a href=/docs/navpatterns/patterns/extending-the-role-center-headlines/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsextending-the-role-center-headlines><span>Extending the Role Center Headlines</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsfeature-localization-for-data-structures-li><a href=/docs/navpatterns/patterns/feature-localization-for-data-structures/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsfeature-localization-for-data-structures><span>Feature Localization For Data Structures</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternshooks-li><a href=/docs/navpatterns/patterns/hooks/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternshooks><span>Hooks</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsimplementation-of-surrogate-keys-using-autoincrement-pattern-li><a href=/docs/navpatterns/patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsimplementation-of-surrogate-keys-using-autoincrement-pattern><span>Surrogate keys using Autoincrement Pattern</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsinstructions-in-the-ui-li><a href=/docs/navpatterns/patterns/instructions-in-the-ui/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsinstructions-in-the-ui><span>Instructions in the UI</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsintegration-of-addresses-li><a href=/docs/navpatterns/patterns/integration-of-addresses/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsintegration-of-addresses><span>Integration of Addresses</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsjournal-error-processing-li><a href=/docs/navpatterns/patterns/journal-error-processing/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsjournal-error-processing><span>Journal Error Processing</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsjournal-template-batch-line-li><a href=/docs/navpatterns/patterns/journal-template-batch-line/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsjournal-template-batch-line><span>Journal Template Batch Line</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsmaster-data-li><a href=/docs/navpatterns/patterns/master-data/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsmaster-data><span>Master Data</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsmulti-file-download-li><a href=/docs/navpatterns/patterns/multi-file-download/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsmulti-file-download><span>Multi-file Download</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsmulti-page-list-li><a href=/docs/navpatterns/patterns/multi-page-list/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsmulti-page-list><span>Multi-Page List</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsmultilanguage-application-data-li><a href=/docs/navpatterns/patterns/multilanguage-application-data/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsmultilanguage-application-data><span>Multilanguage Application Data</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternsnet-exception-handling-in-cal-li><a href=/docs/navpatterns/patterns/net-exception-handling-in-cal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternsnet-exception-handling-in-cal><span>NET Exception Handling in CAL</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal-li><a href=/docs/navpatterns/patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal><span>TryFunction NET Exception Handling in CAL</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsno-series-li><a href=/docs/navpatterns/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsno-series><span>No Series</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternsnotifications-li><a href=/docs/navpatterns/patterns/notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternsnotifications><span>Notifications</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnotificationsin-context-notifications-li><a href=/docs/navpatterns/patterns/notifications/in-context-notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsin-context-notifications><span>In-context Notifications</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern-li><a href=/docs/navpatterns/patterns/notifications/notification-lifecycle-management-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern><span>Notification Lifecycle Management Pattern</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsobserver-li><a href=/docs/navpatterns/patterns/observer/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsobserver><span>Observer</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsposting-routine-select-behavior-li><a href=/docs/navpatterns/patterns/posting-routine-select-behavior/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsposting-routine-select-behavior><span>Posting Routine - Select Behavior</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsproduct-name-li><a href=/docs/navpatterns/patterns/product-name/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsproduct-name><span>Product Name</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternsqueries-li><a href=/docs/navpatterns/patterns/queries/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternsqueries><span>Queries</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsqueriesselect-distinct-with-queries-li><a href=/docs/navpatterns/patterns/queries/select-distinct-with-queries/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesselect-distinct-with-queries><span>SELECT DISTINCT with Queries</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsqueriesuse-queries-to-detect-duplicate-records-li><a href=/docs/navpatterns/patterns/queries/use-queries-to-detect-duplicate-records/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-detect-duplicate-records><span>Use Queries to Detect Duplicate Records</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops-li><a href=/docs/navpatterns/patterns/queries/use-queries-to-replace-nested-loops/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops><span>Use Queries to Replace Nested Loops</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li><a href=/docs/navpatterns/patterns/read-once-initialization-and-validation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsread-once-initialization-and-validation><span>Read-once Initialization and Validation</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsreleased-entity-li><a href=/docs/navpatterns/patterns/released-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsreleased-entity><span>Released Entity</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsreport-selection-li><a href=/docs/navpatterns/patterns/report-selection/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsreport-selection><span>Report Selection</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternssecurity-li><a href=/docs/navpatterns/patterns/security/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternssecurity><span>Security</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity1-sensitive-data-encapsulation-li><a href=/docs/navpatterns/patterns/security/1-sensitive-data-encapsulation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity1-sensitive-data-encapsulation><span>Sensitive Data Encapsulation</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity2-data-encryption-li><a href=/docs/navpatterns/patterns/security/2-data-encryption/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity2-data-encryption><span>Data Encryption</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity3-single-point-of-access-li><a href=/docs/navpatterns/patterns/security/3-single-point-of-access/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity3-single-point-of-access><span>Single Point of Access</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity4-masked-text-li><a href=/docs/navpatterns/patterns/security/4-masked-text/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity4-masked-text><span>Masked Text</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity5-ssl-in-nav-li><a href=/docs/navpatterns/patterns/security/5-ssl-in-nav/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity5-ssl-in-nav><span>SSL in NAV</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssetup-specificity-fallback-li><a href=/docs/navpatterns/patterns/setup-specificity-fallback/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssetup-specificity-fallback><span>Setup Specificity Fallback</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssilent-file-upload-and-download-li><a href=/docs/navpatterns/patterns/silent-file-upload-and-download/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssilent-file-upload-and-download><span>Silent File Upload and Download</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatternspatternssingleton-li><a href=/docs/navpatterns/patterns/singleton/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternssingleton><span>Singleton</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child active-path" id=m-docsnavpatternspatternssingletonsingleton-codeunit-li><a href=/docs/navpatterns/patterns/singleton/singleton-codeunit/ class="align-left pl-0 active td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-codeunit><span class=td-sidebar-nav-active-item>Singleton Codeunit</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternssingletonsingleton-table-li><a href=/docs/navpatterns/patterns/singleton/singleton-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternssingletonsingleton-table><span>Singleton Table</span></a><ul class="ul-5 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssingletonsingleton-tablecue-table-li><a href=/docs/navpatterns/patterns/singleton/singleton-table/cue-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablecue-table><span>Cue Table</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table-li><a href=/docs/navpatterns/patterns/singleton/singleton-table/setup-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table><span>Setup Table</span></a></li></ul></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsstandard-journal-li><a href=/docs/navpatterns/patterns/standard-journal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsstandard-journal><span>Standard Journal</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternstemporary-dataset-report-li><a href=/docs/navpatterns/patterns/temporary-dataset-report/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstemporary-dataset-report><span>Temporary Dataset Report</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternstotals-and-discounts-on-subpages-sales-and-purchases-li><a href=/docs/navpatterns/patterns/totals-and-discounts-on-subpages-sales-and-purchases/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstotals-and-discounts-on-subpages-sales-and-purchases><span>Totals and Discounts on Subpages Sales and Purchases</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternstransfer-custom-fields-li><a href=/docs/navpatterns/patterns/transfer-custom-fields/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstransfer-custom-fields><span>Transfer Custom Fields</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsvariant-facade-li><a href=/docs/navpatterns/patterns/variant-facade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsvariant-facade><span>Variant Facade</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns2-anti-patterns-li><a href=/docs/navpatterns/2-anti-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns2-anti-patterns><span>2. Anti-Patterns</span></a><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns2-anti-patternsnav-upgrade-li><a href=/docs/navpatterns/2-anti-patterns/nav-upgrade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsnav-upgrade><span>Nav Upgrade</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns2-anti-patternsreusable-bugs-li><a href=/docs/navpatterns/2-anti-patterns/reusable-bugs/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsreusable-bugs><span>Reusable Bugs</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li><a href=/docs/navpatterns/3-cal-coding-guidelines/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelines><span>3. CAL Coding Guidelines</span></a><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesign-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesdesign><span>Design</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignby-reference-parameters-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/by-reference-parameters/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignby-reference-parameters><span>By Reference Parameters</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignclass-coupling-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/class-coupling/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignclass-coupling><span>Class Coupling</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesigncyclomatic-complexity-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/cyclomatic-complexity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesigncyclomatic-complexity><span>Cyclomatic Complexity</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignencapsulate-local-functionality-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/encapsulate-local-functionality/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignencapsulate-local-functionality><span>Encapsulate Local Functionality</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignfindset-findfirst-findlast-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/findset-findfirst-findlast/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignfindset-findfirst-findlast><span>FINDSET FINDFIRST FINDLAST</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesigninitialized-variables-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/initialized-variables/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesigninitialized-variables><span>Initialized Variables</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignmaintainability-index-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/maintainability-index/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignmaintainability-index><span>Maintainability Index</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignparameter-placeholders-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/parameter-placeholders/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignparameter-placeholders><span>Parameter Placeholders</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignstatic-object-invocation-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/static-object-invocation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignstatic-object-invocation><span>Static Object Invocation</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignunreachable-code-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/unreachable-code/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignunreachable-code><span>Unreachable Code</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignunused-initialized-variables-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/unused-initialized-variables/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignunused-initialized-variables><span>Unused Initialized Variables</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignunused-variables-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/unused-variables/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignunused-variables><span>Unused Variables</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignvariable-capacity-mismatch-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/variable-capacity-mismatch/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignvariable-capacity-mismatch><span>Variable Capacity Mismatch</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision-li><a href=/docs/navpatterns/3-cal-coding-guidelines/design/with-scope-name-collision/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision><span>WITH Scope Name Collision</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li><a href=/docs/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types><span>Internally used DotNet Types</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization-li><a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization><span>Internationalization</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate-li><a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate><span>Using Calcdate</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li><a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability><span>Localizability</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilitycaptionml-for-system-tables-li><a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/captionml-for-system-tables/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilitycaptionml-for-system-tables><span>CaptionML on System Pages</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityfieldcaption-and-tablecaption-li><a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/fieldcaption-and-tablecaption/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityfieldcaption-and-tablecaption><span>FIELDCAPTION and TABLECAPTION</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityglobal-text-constants-li><a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/global-text-constants/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityglobal-text-constants><span>Global Text Constants</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityuse-text-constants-li><a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/use-text-constants/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityuse-text-constants><span>Use Text Constants</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityusing-optioncaptionml-li><a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/using-optioncaptionml/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityusing-optioncaptionml><span>Using OptionCaptionML</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadability-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesreadability><span>Readability</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybegin-as-an-afterword-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/begin-as-an-afterword/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybegin-as-an-afterword><span>Begin as an 'After Word'</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybegin-end-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/begin-end/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybegin-end><span>Begin-End - Compound Only</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybinary-operator-line-start-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/binary-operator-line-start/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybinary-operator-line-start><span>Binary Operator to Start Line</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityblank-lines-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/blank-lines/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityblank-lines><span>Blank Lines</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitycase-actions-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/case-actions/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitycase-actions><span>CASE Action</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitycolon-usage-in-case-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitycolon-usage-in-case><span>Colon usage in CASE</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitycomments-curly-brackets-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitycomments-curly-brackets><span>Comments inside Curly Brackets</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitycomments-spacing-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/comments-spacing/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitycomments-spacing><span>Comment Spacing</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityend-else-pair-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/end-else-pair/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityend-else-pair><span>END ELSE Pair</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityindentation-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/indentation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityindentation><span>Indentation</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitykeyword-pairs-indentation-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/keyword-pairs-indentation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitykeyword-pairs-indentation><span>Keyword Pairs - Indentation</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityline-start-keywords-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/line-start-keywords/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityline-start-keywords><span>Line Start Keywords</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitylonely-repeat-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/lonely-repeat/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitylonely-repeat><span>Lonely Repeat</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitynamed-invocations-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/named-invocations/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitynamed-invocations><span>Named Invocations</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitynested-withs-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/nested-withs/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitynested-withs><span>Nested WITHs</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityone-statement-per-line-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/one-statement-per-line/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityone-statement-per-line><span>One Statement Per Line</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityseparate-if-and-else-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/separate-if-and-else/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityseparate-if-and-else><span>Separate IF and ELSE</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityspacing-binary-operators-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/spacing-binary-operators/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityspacing-binary-operators><span>Spacing Binary Operators</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityspacing-brackets-and-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/spacing-brackets-and/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityspacing-brackets-and><span>Spacing Brackets and ::</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityspacing-unary-operators-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/spacing-unary-operators/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityspacing-unary-operators><span>Spacing Unary Operators</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitysuggested-abbreviations-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/suggested-abbreviations/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitysuggested-abbreviations><span>Suggested Abbreviations</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitytemporary-variable-naming-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/temporary-variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitytemporary-variable-naming><span>Temporary Variable Naming</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitytextconst-suffixes-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/textconst-suffixes/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitytextconst-suffixes><span>TextConst Suffixes</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunary-operator-line-end-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/unary-operator-line-end/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunary-operator-line-end><span>Unary Operator Line End</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-compound-parenthesis-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/unnecessary-compound-parenthesis/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-compound-parenthesis><span>Unnecessary Compound Parenthesis</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-else-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/unnecessary-else/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-else><span>Unnecessary ELSE</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-function-parenthesis-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/unnecessary-function-parenthesis/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-function-parenthesis><span>Unnecessary Function Parenthesis</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-separators-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/unnecessary-separators/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-separators><span>Unnecessary Separators</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-truefalse-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/unnecessary-truefalse/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityunnecessary-truefalse><span>Unnecessary TRUE/FALSE</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariable-already-scoped-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variable-already-scoped/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariable-already-scoped><span>Variable Already Scoped</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariable-naming-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariable-naming><span>Variable Naming</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariables-declarations-order-li><a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariables-declarations-order><span>Variables Declarations Order</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesux-li><a href=/docs/navpatterns/3-cal-coding-guidelines/ux/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesux><span>UX</span></a><ul class="ul-4 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxactions-images-li><a href=/docs/navpatterns/3-cal-coding-guidelines/ux/actions-images/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxactions-images><span>Actions - Images</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxconfirm-li><a href=/docs/navpatterns/3-cal-coding-guidelines/ux/confirm/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxconfirm><span>CONFIRM</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxfielderror-li><a href=/docs/navpatterns/3-cal-coding-guidelines/ux/fielderror/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxfielderror><span>FIELDERROR</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxmessage-and-error-li><a href=/docs/navpatterns/3-cal-coding-guidelines/ux/message-and-error/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxmessage-and-error><span>MESSAGE and ERROR</span></a></li></ul></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns4-get-involved-li><a href=/docs/navpatterns/4-get-involved/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns4-get-involved><span>(OLD) Get Involved</span></a><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns4-get-involvedcode-of-conduct-li><a href=/docs/navpatterns/4-get-involved/code-of-conduct/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedcode-of-conduct><span>Code of Conduct</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns4-get-involvedpatterns-authors-li><a href=/docs/navpatterns/4-get-involved/patterns-authors/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedpatterns-authors><span>Patterns Authors</span></a></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns4-get-involvedtemplate-for-writing-nav-design-patterns-li><a href=/docs/navpatterns/4-get-involved/template-for-writing-nav-design-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedtemplate-for-writing-nav-design-patterns><span>Template for writing Nav Design Patterns</span></a></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternsrelated-links-li><a href=/docs/navpatterns/related-links/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternsrelated-links><span>Related Links</span></a></li></ul></li><li 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<a href=https://github.com/microsoft/alguidelines/issues/new class=td-page-meta--project-issue target=_blank rel=noopener><i class="fas fa-tasks fa-fw"></i> Create project issue</a></div><div class="taxonomy taxonomy-terms-cloud taxo-tags"><h5 class=taxonomy-title>Tag Cloud</h5><ul class=taxonomy-terms><li><a class=taxonomy-term href=https://alguidelines.dev/tags/al/ data-taxonomy-term=al><span class=taxonomy-label>AL</span><span class=taxonomy-count>30</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/api/ data-taxonomy-term=api><span class=taxonomy-label>API</span><span class=taxonomy-count>3</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span><span class=taxonomy-count>136</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/decoupling/ data-taxonomy-term=decoupling><span class=taxonomy-label>Decoupling</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/extendability/ data-taxonomy-term=extendability><span class=taxonomy-label>Extendability</span><span class=taxonomy-count>3</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/interface/ data-taxonomy-term=interface><span class=taxonomy-label>Interface</span><span class=taxonomy-count>1</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/performance/ data-taxonomy-term=performance><span class=taxonomy-label>Performance</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/readability/ data-taxonomy-term=readability><span class=taxonomy-label>Readability</span><span class=taxonomy-count>53</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/telemetry/ data-taxonomy-term=telemetry><span class=taxonomy-label>Telemetry</span><span class=taxonomy-count>1</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/testability/ data-taxonomy-term=testability><span class=taxonomy-label>Testability</span><span class=taxonomy-count>2</span></a></li></ul></div><div class="taxonomy taxonomy-terms-cloud taxo-categories"><h5 class=taxonomy-title>Categories</h5><ul class=taxonomy-terms><li><a class=taxonomy-term href=https://alguidelines.dev/categories/best-practice/ data-taxonomy-term=best-practice><span class=taxonomy-label>Best Practice</span><span class=taxonomy-count>86</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span><span class=taxonomy-count>71</span></a></li></ul></div></aside><main class="col-12 col-md-9 col-xl-8 pl-md-5" role=main><nav aria-label=breadcrumb class=td-breadcrumbs><ol class=breadcrumb><li class=breadcrumb-item><a href=https://alguidelines.dev/docs/>Docs</a></li><li class=breadcrumb-item><a href=https://alguidelines.dev/docs/navpatterns/>NAV Patterns Archive</a></li><li class=breadcrumb-item><a href=https://alguidelines.dev/docs/navpatterns/patterns/>1. Patterns</a></li><li class=breadcrumb-item><a href=https://alguidelines.dev/docs/navpatterns/patterns/singleton/>Singleton</a></li><li class="breadcrumb-item active" aria-current=page><a href=https://alguidelines.dev/docs/navpatterns/patterns/singleton/singleton-codeunit/>Singleton Codeunit</a></li></ol></nav><div class=td-content><h1>Singleton Codeunit</h1><header class=article-meta><div class="taxonomy taxonomy-terms-article taxo-tags"><h5 class=taxonomy-title>Tags:</h5><ul class=taxonomy-terms><li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span></a></li></ul></div><div class="taxonomy taxonomy-terms-article taxo-categories"><h5 class=taxonomy-title>Categories:</h5><ul class=taxonomy-terms><li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span></a></li></ul></div></header><p><em>By Bogdana Botez at Microsoft Development Center Copenhagen</em></p><p><a href=Singleton-Codeunit.png><img src=Singleton-Codeunit.png alt=" "></a></p><p><strong>Problem</strong>: In some situations, global state needs to be preserved at runtime throughout a session.</p><p>There are functionality areas in NAV where centralized application management code is needed, like for example managing permissions, notifications, the debugger etc. State needs to be preserved across calls to the management codeunit.</p><p>For example:</p><ul><li>The debugger needs to remember the session which is being debugged</li><li>The permission manager has a testability function, where it can be set to emulate that it’s running as a SaaS (Software As A Service – the cloud) platform, even when the tests run in a “on-premise” local lab.</li></ul><p>Take for example the following test of Azure ML (Azure Machine Learning) integration with NAV.</p><p>Context: Azure Machine Learning services are paid. However, Dynamics NAV includes a monthly pre-paid quota of Azure ML, which can be used for free by the users. There is an upper limit to this quota, and when it is reached, Azure ML services are turned off until the next month starts and a new quota becomes available for consumption.</p><p>The test below checks that, when the monthly quota is exceeded, then the function IsAzureMLLimitReached returns TRUE.</p><div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=display:flex><span>[Test]<span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>PROCEDURE</span><span style=color:#f8f8f8;text-decoration:underline> </span>AzureMLProcessingTimeExceedsLimit@<span style=color:#0000cf;font-weight:700>11</span><span style=color:#ce5c00;font-weight:700>()</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>AzureMachineLearningUsage@<span style=color:#0000cf;font-weight:700>1004</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>2002</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>ProcessingTime@<span style=color:#0000cf;font-weight:700>1000</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Decimal</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>// [SCENARIO] Azure Machine Learning Processing time exceeds AzureML limit
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</span></span></span><span style=display:flex><span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>// [GIVEN] AzureMachineLearningUsage > 0
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</span></span></span><span style=display:flex><span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline> </span>Initialize<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>// calls PermissionManager.SetTestabilitySoftwareAsAService(TRUE);
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</span></span></span><span style=display:flex><span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline> </span>ProcessingTime<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>LibraryRandom<span style=color:#ce5c00;font-weight:700>.</span>RandDec<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#0000cf;font-weight:700>1000</span><span style=color:#000;font-weight:700>,</span><span style=color:#0000cf;font-weight:700>2</span><span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>AzureMachineLearningUsage<span style=color:#ce5c00;font-weight:700>.</span>IncrementTotalProcessingTime<span style=color:#ce5c00;font-weight:700>(</span>ProcessingTime<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>// [WHEN] When IsAzureMLLimitReached is invoked with Limit more than Processing time
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</span></span></span><span style=display:flex><span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>// [THEN] HasAzureLimitReached returns TRUE
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</span></span></span><span style=display:flex><span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline> </span>Assert<span style=color:#ce5c00;font-weight:700>.</span>IsTrue<span style=color:#ce5c00;font-weight:700>(</span>AzureMachineLearningUsage<span style=color:#ce5c00;font-weight:700>.</span>IsAzureMLLimitReached<span style=color:#ce5c00;font-weight:700>(</span>ProcessingTime<span style=color:#f8f8f8;text-decoration:underline> </span>-<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>1</span><span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>,</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#4e9a06>'HasAzureLimitReached returns wrong value when Processing time exceeds Limit.'</span><span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>PermissionManager<span style=color:#ce5c00;font-weight:700>.</span>SetTestabilitySoftwareAsAService<span style=color:#ce5c00;font-weight:700>(</span>FALSE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span></code></pre></div><p>The figure below explains what happens when the Permission Manager is not a singleton. When it is invoked from different places (first from the test, second from the production code), then different instances of the Permission Manager will fire up and answer. In detail:</p><ol><li>The test calls Initialize which sets SaaS=TRUE in codeunit Permission Manager</li><li>The test calls into production code to validate it works as expected. It calls AzureMachineLearningUsage codeunit to find out if the monthly quota has been reached. The function IsAzureMLLimitReached in AzureMachineLearningUsage codeunit is designed only for SaaS. If the code doesn’t run in SaaS, then it always returns FALSE.</li><li>Therefore, a call to PermissionManager is made, to find out if the environment is SaaS.</li><li>However, a different instance of Permission Manager is reached – and instance where SaaS was never set to TRUE. This is a mistake – the test intended to simulate SaaS, but the state it set in the beginning is not reachable from production code.</li><li>The production code will assess (wrongly) that it’s not running SaaS, and say that the Azure ML limit has not been reached (incorrect – and the test fails).</li></ol><p><a href=Singleton-Codeunit-_2D00_-example-_2D00_-bad.PNG><img src=Singleton-Codeunit-_2D00_-example-_2D00_-bad.PNG alt=" "></a></p><p><strong>Solution:</strong> restrict the number of instantiations of a codeunit to only one, by setting the codeunit property <strong>SingleInstance</strong> to <strong>Yes</strong>.</p><p>Returning to the previous example, let’s analyze the case when the codeunit Permission Manager is a singleton codeunit:</p><p><a href=2313.Singleton-Codeunit-_2D00_-CSIDE-SingleInstance-property.PNG><img src=2313.Singleton-Codeunit-_2D00_-CSIDE-SingleInstance-property.PNG alt=" "></a></p><p>When the codeunit Permission Manager is a singleton, then no matter from where it is invoked, the same instance will be reached. Therefore, the status set by the test (SaaS = TRUE) will be reachable from the production code, and the test will pass, as seen in the figure below.</p><p><a href=Singleton-Codeunit-_2D00_-example-_2D00_-good.PNG><img src=Singleton-Codeunit-_2D00_-example-_2D00_-good.PNG alt=" "></a></p><p><strong>Consequences</strong></p><p>1. Use Singleton Codeunit with care and only when there is no other solution. Preserving a global state could often enough be more harmful than useful. One risk is that tests might fail apparently non-deterministically.</p><p>For example, a problem we have met in the development team for Madeira release, was that the singleton codeunit function PermissionManager.SetSoftwareAsAService(TRUE) is often used to emulate and test SaaS conditions. However, if a test ‘forgets’ to reset the state to default (FALSE), then another codeunit which is not supposed to emulate SaaS, will suddenly run as SaaS and will fail. Even if the test has code that resets the state to FALSE, this code might never be reached because of an earlier failure or other error in the test which would stop execution.</p><p>2. The singleton codeunit is only “alive” for the current session. If the user logs out, the old session is closed and the singleton cleared out so any values stored in the old session’s singleton will be lost when the session was closed. When the user logs in again, a new session (with a new fresh instance of the singleton) will be created.</p><p><strong>NAV Usages</strong></p><p>Most of the usages in NAV refer to the so-called “management codeunits”. The management codeunits are needed to run, in a centralized way, various modular parts of the application (features), like the CRM integration, Permissions, Workflows etc. Some of the <strong>Singleton Codeunits</strong> in NAV are listed below:</p><ul><li>Codeunit 423 Change Log Management</li><li>Codeunit 1503 Workflow Record Management</li><li>Codeunit 1511 Notification Lifecycle Mgt.</li><li>Codeunit 1629 Office Attachment Manager</li><li>Codeunit 1632 Office Error Engine</li><li>Codeunit 5150 Integration Management</li><li>Codeunit 9002 Permission Manager</li><li>Etc.</li></ul><p><strong>Note:</strong> while the object-oriented <strong>Singleton</strong> pattern can restrict the number of instantiations of the singleton to an integer n > 0, in Dynamics NAV the <strong>Singleton Codeunit</strong> can only have n=1.</p><div class="text-muted mt-5 pt-3 border-top">Last modified February 24, 2022: <a href=https://github.com/microsoft/alguidelines/commit/5ee0436639455a35835c5ce88241d3fad662ee06>Added tags & categories + cleanup (5ee04366)</a>
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