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alguidelines/navpatterns/1-patterns/multi-file-download/index.html
JeremyVyska 62b3194f3b deploy: 6771da7dc8
2021-11-10 09:19:40 +00:00

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<ul class=topics>
<li data-nav-id=/welcome/ title=Welcome class=dd-item><a href=/welcome/><b><i class="fas fa-home"></i> </b>Welcome</a><ul></ul></li>
<li data-nav-id=/bcpatterns/ title="BC Patterns" class=dd-item><a href=/bcpatterns/><b><i class="fas fa-clone"></i> </b>BC Patterns</a><ul></ul></li>
<li data-nav-id=/bcbestpractices/ title="BC Dev. Best Practices" class=dd-item><a href=/bcbestpractices/><b><i class="fas fa-medal"></i> </b>BC Dev. Best Practices</a><ul></ul></li>
<li data-nav-id=/navpatterns/ title="NAV Patterns Archive" class="dd-item parent"><a href=/navpatterns/><b><i class="fas fa-save"></i> </b>NAV Patterns Archive</a><ul>
<li data-nav-id=/navpatterns/1-patterns/ title="1. Patterns" class="dd-item parent"><a href=/navpatterns/1-patterns/>1. Patterns</a><ul>
<li data-nav-id=/navpatterns/1-patterns/activity-log/ title="Activity Logs" class=dd-item><a href=/navpatterns/1-patterns/activity-log/>Activity Logs</a></li>
<li data-nav-id=/navpatterns/1-patterns/argument-table/ title="Argument Table" class=dd-item><a href=/navpatterns/1-patterns/argument-table/>Argument Table</a></li>
<li data-nav-id=/navpatterns/1-patterns/blocked-entity/ title="Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/>Blocked Entity</a><ul>
<li data-nav-id=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/ title="Data Driven Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/>Data Driven Blocked Entity</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/cached-web-service-calls/ title="Cached Web Server Calls" class=dd-item><a href=/navpatterns/1-patterns/cached-web-service-calls/>Cached Web Server Calls</a></li>
<li data-nav-id=/navpatterns/1-patterns/conditional-cascading-update/ title="Conditional Cascading Update" class=dd-item><a href=/navpatterns/1-patterns/conditional-cascading-update/>Conditional Cascading Update</a></li>
<li data-nav-id=/navpatterns/1-patterns/copy-document/ title="Copy Document" class=dd-item><a href=/navpatterns/1-patterns/copy-document/>Copy Document</a></li>
<li data-nav-id=/navpatterns/1-patterns/create-data-from-templates/ title="Create Data from Templates" class=dd-item><a href=/navpatterns/1-patterns/create-data-from-templates/>Create Data from Templates</a></li>
<li data-nav-id=/navpatterns/1-patterns/create-urls-to-nav-clients/ title="Create URLs to NAV Clients" class=dd-item><a href=/navpatterns/1-patterns/create-urls-to-nav-clients/>Create URLs to NAV Clients</a></li>
<li data-nav-id=/navpatterns/1-patterns/creating-custom-charts/ title="Creating Custom Charts" class=dd-item><a href=/navpatterns/1-patterns/creating-custom-charts/>Creating Custom Charts</a></li>
<li data-nav-id=/navpatterns/1-patterns/cross-session-events/ title="Cross Session Events" class=dd-item><a href=/navpatterns/1-patterns/cross-session-events/>Cross Session Events</a></li>
<li data-nav-id=/navpatterns/1-patterns/currently-active-record/ title="Currently Active Record" class=dd-item><a href=/navpatterns/1-patterns/currently-active-record/>Currently Active Record</a></li>
<li data-nav-id=/navpatterns/1-patterns/data-migration-facade/ title="Data Migration Facade" class=dd-item><a href=/navpatterns/1-patterns/data-migration-facade/>Data Migration Facade</a></li>
<li data-nav-id=/navpatterns/1-patterns/discovery-event/ title="Discovery Event" class=dd-item><a href=/navpatterns/1-patterns/discovery-event/>Discovery Event</a></li>
<li data-nav-id=/navpatterns/1-patterns/document/ title=Document class=dd-item><a href=/navpatterns/1-patterns/document/>Document</a></li>
<li data-nav-id=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/ title="Easy Update Of Setup Or Supplementary Information" class=dd-item><a href=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/>Easy Update Of Setup Or Supplementary Information</a></li>
<li data-nav-id=/navpatterns/1-patterns/error-message-processing/ title="Error Message Processing" class=dd-item><a href=/navpatterns/1-patterns/error-message-processing/>Error Message Processing</a></li>
<li data-nav-id=/navpatterns/1-patterns/extending-the-role-center-headlines/ title="Extending the Role Center Headlines" class=dd-item><a href=/navpatterns/1-patterns/extending-the-role-center-headlines/>Extending the Role Center Headlines</a></li>
<li data-nav-id=/navpatterns/1-patterns/feature-localization-for-data-structures/ title="Feature Localization For Data Structures" class=dd-item><a href=/navpatterns/1-patterns/feature-localization-for-data-structures/>Feature Localization For Data Structures</a></li>
<li data-nav-id=/navpatterns/1-patterns/hooks/ title=Hooks class=dd-item><a href=/navpatterns/1-patterns/hooks/>Hooks</a></li>
<li data-nav-id=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/ title="Surrogate keys using Autoincrement Pattern" class=dd-item><a href=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/>Surrogate keys using Autoincrement Pattern</a></li>
<li data-nav-id=/navpatterns/1-patterns/instructions-in-the-ui/ title="Instructions in the UI" class=dd-item><a href=/navpatterns/1-patterns/instructions-in-the-ui/>Instructions in the UI</a></li>
<li data-nav-id=/navpatterns/1-patterns/integration-of-addresses/ title="Integration of Addresses" class=dd-item><a href=/navpatterns/1-patterns/integration-of-addresses/>Integration of Addresses</a></li>
<li data-nav-id=/navpatterns/1-patterns/journal-error-processing/ title="Journal Error Processing" class=dd-item><a href=/navpatterns/1-patterns/journal-error-processing/>Journal Error Processing</a></li>
<li data-nav-id=/navpatterns/1-patterns/journal-template-batch-line/ title="Journal Template Batch Line" class=dd-item><a href=/navpatterns/1-patterns/journal-template-batch-line/>Journal Template Batch Line</a></li>
<li data-nav-id=/navpatterns/1-patterns/master-data/ title="Master Data" class=dd-item><a href=/navpatterns/1-patterns/master-data/>Master Data</a></li>
<li data-nav-id=/navpatterns/1-patterns/multi-file-download/ title="Multi-file Download" class="dd-item active"><a href=/navpatterns/1-patterns/multi-file-download/>Multi-file Download</a></li>
<li data-nav-id=/navpatterns/1-patterns/multi-page-list/ title="Multi-Page List" class=dd-item><a href=/navpatterns/1-patterns/multi-page-list/>Multi-Page List</a></li>
<li data-nav-id=/navpatterns/1-patterns/multilanguage-application-data/ title="Multilanguage Application Data" class=dd-item><a href=/navpatterns/1-patterns/multilanguage-application-data/>Multilanguage Application Data</a></li>
<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/ title="NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/>NET Exception Handling in CAL</a><ul>
<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ title="TryFunction NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/>TryFunction NET Exception Handling in CAL</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/no-series/ title="No Series" class=dd-item><a href=/navpatterns/1-patterns/no-series/>No Series</a></li>
<li data-nav-id=/navpatterns/1-patterns/notifications/ title=Notifications class=dd-item><a href=/navpatterns/1-patterns/notifications/>Notifications</a><ul>
<li data-nav-id=/navpatterns/1-patterns/notifications/in-context-notifications/ title="In-context Notifications" class=dd-item><a href=/navpatterns/1-patterns/notifications/in-context-notifications/>In-context Notifications</a></li>
<li data-nav-id=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/ title="Notification Lifecycle Management Pattern" class=dd-item><a href=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/>Notification Lifecycle Management Pattern</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/observer/ title=Observer class=dd-item><a href=/navpatterns/1-patterns/observer/>Observer</a></li>
<li data-nav-id=/navpatterns/1-patterns/posting-routine-select-behavior/ title="Posting Routine - Select Behavior" class=dd-item><a href=/navpatterns/1-patterns/posting-routine-select-behavior/>Posting Routine - Select Behavior</a></li>
<li data-nav-id=/navpatterns/1-patterns/product-name/ title="Product Name" class=dd-item><a href=/navpatterns/1-patterns/product-name/>Product Name</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/ title=Queries class=dd-item><a href=/navpatterns/1-patterns/queries/>Queries</a><ul>
<li data-nav-id=/navpatterns/1-patterns/queries/select-distinct-with-queries/ title="SELECT DISTINCT with Queries" class=dd-item><a href=/navpatterns/1-patterns/queries/select-distinct-with-queries/>SELECT DISTINCT with Queries</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/ title="use Queries to Detect Duplicate Records" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/>use Queries to Detect Duplicate Records</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/ title="Use Queries to Replace Nested Loops" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/>Use Queries to Replace Nested Loops</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/read-once-initialization-and-validation/ title="Read-once Initialization and Validation" class=dd-item><a href=/navpatterns/1-patterns/read-once-initialization-and-validation/>Read-once Initialization and Validation</a></li>
<li data-nav-id=/navpatterns/1-patterns/released-entity/ title="Released Entity" class=dd-item><a href=/navpatterns/1-patterns/released-entity/>Released Entity</a></li>
<li data-nav-id=/navpatterns/1-patterns/report-selection/ title="Report Selection" class=dd-item><a href=/navpatterns/1-patterns/report-selection/>Report Selection</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/ title=Security class=dd-item><a href=/navpatterns/1-patterns/security/>Security</a></li>
<li data-nav-id=/navpatterns/1-patterns/setup-specificity-fallback/ title="Setup Specificity Fallback" class=dd-item><a href=/navpatterns/1-patterns/setup-specificity-fallback/>Setup Specificity Fallback</a></li>
<li data-nav-id=/navpatterns/1-patterns/silent-file-upload-and-download/ title="Silent File Upload and Download" class=dd-item><a href=/navpatterns/1-patterns/silent-file-upload-and-download/>Silent File Upload and Download</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/ title=Singleton class=dd-item><a href=/navpatterns/1-patterns/singleton/>Singleton</a><ul>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-codeunit/ title="Singleton Codeunit" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-codeunit/>Singleton Codeunit</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/ title="Singleton Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/>Singleton Table</a><ul>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/cue-table/ title="Cue Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/cue-table/>Cue Table</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/setup-table/ title="Setup Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/setup-table/>Setup Table</a></li></ul></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/standard-journal/ title="Standard Journal" class=dd-item><a href=/navpatterns/1-patterns/standard-journal/>Standard Journal</a></li>
<li data-nav-id=/navpatterns/1-patterns/temporary-dataset-report/ title="Temporary Dataset Report" class=dd-item><a href=/navpatterns/1-patterns/temporary-dataset-report/>Temporary Dataset Report</a></li>
<li data-nav-id=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/ title="Totals and Discounts on Subpages Sales and Purchases" class=dd-item><a href=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/>Totals and Discounts on Subpages Sales and Purchases</a></li>
<li data-nav-id=/navpatterns/1-patterns/transfer-custom-fields/ title="Transfer Custom Fields" class=dd-item><a href=/navpatterns/1-patterns/transfer-custom-fields/>Transfer Custom Fields</a></li>
<li data-nav-id=/navpatterns/1-patterns/variant-facade/ title="Variant Facade" class=dd-item><a href=/navpatterns/1-patterns/variant-facade/>Variant Facade</a></li></ul></li>
<li data-nav-id=/navpatterns/2-anti-patterns/ title="2. Anti-Patterns" class=dd-item><a href=/navpatterns/2-anti-patterns/>2. Anti-Patterns</a><ul>
<li data-nav-id=/navpatterns/2-anti-patterns/nav-upgrade/ title="Nav Upgrade" class=dd-item><a href=/navpatterns/2-anti-patterns/nav-upgrade/>Nav Upgrade</a></li>
<li data-nav-id=/navpatterns/2-anti-patterns/reusable-bugs/ title="Reusable Bugs" class=dd-item><a href=/navpatterns/2-anti-patterns/reusable-bugs/>Reusable Bugs</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ title="3. CAL Coding Guidelines" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/>3. CAL Coding Guidelines</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/ title=Design class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/>Design</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ title="Internally-used DotNet Types" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/>Internally-used DotNet Types</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internationalization/ title=Internationalization class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internationalization/>Internationalization</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/ title="Using Calcdate" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/>Using Calcdate</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/ title=Localizability class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/>Localizability</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/captionml-for-system-tables/ title="CaptionML on System Pages" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/captionml-for-system-tables/>CaptionML on System Pages</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/fieldcaption-and-tablecaption/ title="FIELDCAPTION and TABLECAPTION" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/fieldcaption-and-tablecaption/>FIELDCAPTION and TABLECAPTION</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/global-text-constants/ title="Global Text Constants" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/global-text-constants/>Global Text Constants</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/use-text-constants/ title="Use Text Constants" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/use-text-constants/>Use Text Constants</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/using-optioncaptionml/ title="Using OptionCaptionML" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/using-optioncaptionml/>Using OptionCaptionML</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/ title=Readability class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/>Readability</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/begin-as-an-afterword/ title="Begin as an 'After Word'" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/begin-as-an-afterword/>Begin as an 'After Word'</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/begin-end/ title="Begin-End - Compound Only" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/begin-end/>Begin-End - Compound Only</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/binary-operator-line-start/ title="Binary Operator to Start Line" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/binary-operator-line-start/>Binary Operator to Start Line</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/ title="Blank Lines.md" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/>Blank Lines.md</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/case-actions/ title="CASE Action" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/case-actions/>CASE Action</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/ title="Colon usage in CASE" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/>Colon usage in CASE</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/ title="Comments inside Curly Brackets" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/>Comments inside Curly Brackets</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/comments-spacing/ title="Comment Spacing" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/comments-spacing/>Comment Spacing</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/end-else-pair/ title="END ELSE Pair" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/end-else-pair/>END ELSE Pair</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/indentation/ title=Indentation class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/indentation/>Indentation</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/keyword-pairs-indentation/ title="Keyword Pairs - Indentation" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/keyword-pairs-indentation/>Keyword Pairs - Indentation</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/line-start-keywords/ title="Line Start Keywords" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/line-start-keywords/>Line Start Keywords</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/lonely-repeat/ title="Lonely Repeat" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/lonely-repeat/>Lonely Repeat</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/named-invocations/ title="Named Invocations" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/named-invocations/>Named Invocations</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/nested-withs/ title="Nested WITHs" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/nested-withs/>Nested WITHs</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/one-statement-per-line/ title="One Statement Per Line" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/one-statement-per-line/>One Statement Per Line</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/separate-if-and-else/ title="Separate IF and ELSE" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/separate-if-and-else/>Separate IF and ELSE</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/spacing-binary-operators/ title="Spacing Binary Operators" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/spacing-binary-operators/>Spacing Binary Operators</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/spacing-brackets-and/ title="Spacing Brackets and ::" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/spacing-brackets-and/>Spacing Brackets and ::</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/spacing-unary-operators/ title="Spacing Unary Operators" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/spacing-unary-operators/>Spacing Unary Operators</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/suggested-abbreviations/ title="Suggested Abbreviations" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/suggested-abbreviations/>Suggested Abbreviations</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/temporary-variable-naming/ title="Temporary Variable Naming" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/temporary-variable-naming/>Temporary Variable Naming</a></li>
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<h1>Multi-file Download</h1>
<h4 id=_by-martin-dam-at-microsoft-development-center-copenhagen_><em>By Martin Dam at Microsoft Development Center Copenhagen</em></h4>
<h2 id=abstract>Abstract</h2>
<p>The goal of this pattern is to enable the users to download multiple files as a zip file instead of downloading one by one. On the Web Client this is preferred way of delivering multiple files since it is one of the web patterns and we cannot use File Management code unit to place files silently on the machine.</p>
<h2 id=description>Description</h2>
<p>When generating reports that consists of multiple, and usually an unknown number of files, the developer will have to handle the download which also depends on the client the user is on. The problem is that the WinClient has access to the user&rsquo;s file system, whereas the web client does not. Following web guidelines, and the fact that client side .NET is not available in Web client, you can&rsquo;t initiate multiple downloads which requires the developer respond to the type of client. In some browsers it is possible to download files one-by-one in the Web client by using a confirm dialog, however this is a hack and should not be used.</p>
<p>To solve this problem, a generic download mechanism is used that is client dependent event when multiple files need to be downloaded. For Web client the files are compressed using ZIP and for WinClient the files are downloaded directly to the file system.</p>
<p>The pattern is usable for all objects that output multiple files and is available in both WinClient and Web client.</p>
<h2 id=usage>Usage</h2>
<p>The pattern consists of two steps: 1) Gathering the files and 2) downloading the file(s)</p>
<p>For first step consists of a loop that goes through the files that needs to be downloaded. If it is on the Web client, the files are added to a ZIP archive server-side using a naming convention defined by the integration function GetSeriesFileName. This function takes a filename and number, and transforms it to unique names following a meaningful deterministic pattern e.g. prepend an integer before the file extension. The same function is used when the temporary files are created server side, so the files can be found deterministically later. This removes the need for storing filenames and consequently allows an arbitrary number of files. The second integration function: GetTotalNumberOfFiles, returns the total number of files generated during the data processing and makes the pattern able to handle an arbitrary number of files.</p>
<p>The second step is the actually download of file(s). For the Web client this consists of closing the ZIP achieve and downloading via the standard download handler that works in the Web client. For the Win client, the files are saved directly to the client during the first step.</p>
<p>Code 1: File loop shows an example implementation of this pattern. ServerFileName is generated at the beginning of the report/codeunit, and is the base for GetSeriesFilename. The file that is actually written to during data processing is stored in another variable which holds the output from GetSeriesFilename on the current file number. Note; the example code will only create a ZIP file if there in fact are multiple files to be downloaded.</p>
<pre><code>IF FileName = '' THEN
ERROR(SupplyFileNameErr);
IF ZipMultipleFiles AND (GetTotalNumberOfFiles \&gt; 1) AND FileManagement.IsWebClient
THEN BEGIN
Basename := FileManagement.GetFileName(FileName);
ZipFileName := FileManagement.CreateZipArchiveObject;
FOR FileNo := 1 TO GetTotalNumberOfFiles DO
FileManagement.AddFileToZipArchive(
GetSeriesFilename(ServerFileName,FileNo),GetSeriesFilename(Basename,FileNo));
FileManagement.DownloadHandler(ZipFileName,'','','',
STRSUBSTNO('%1.zip',FileManagement.GetFileNameWithoutExtension(FileName)))
END ELSE BEGIN
IF FileManagement.IsWebClient THEN BEGIN
IF GetTotalNumberOfFile \&gt; 1 THEN
ERROR(MultipleFilesWebClientErr);
FileManagementDownloadHandler(GetSeriesFilename(ServerFileName,1),'','','',
FileManagement.GetFileName(FileName));
END ELSE
FOR FileNo := 1 TO GetTotalNumberOfFiles DO
FileManagement.DownloadToFile(GetSeriesFilieName(ServerFileName,FileNo),
GetSeriesFilename(FileName,FileNo));
END;
</code></pre>
<p><em>Code 1: File loop</em></p>
<p>__</p>
<p>The following code is an example implementation of the GetSeriesFilename function. It needs to support the case where no directory is given, only a filename, in order to add files to the root of the ZIP archive. The example will add a file number right before the extension, e.g. C:\directory\file.txt will become C:\directory\file1.txt etc.</p>
<pre><code>LOCAL GetSeriesFilename(FileName : Text;FileNo : Integer) : Text
IF STRPOS(FileName,'\\') &lt;\&gt; 0 THEN
Directory := FileMgt.GetDirectoryName(FileName) + '\\';
EXIT(Directory + FileMgt.GetFileNameWithoutExtension(FileName) + FORMAT(FileNo) + '.' +
FileMgt.GetExtension(FileName));
</code></pre>
<h4 id=_code-2-getseriesfilename_><em>Code 2: GetSeriesFilename</em></h4>
<p>The pattern depends on .NET library System.IO.Compression.ZipFile, which from NAV 2015 is implemented in Codeunit 419 (File management). It consists of three functions:</p>
<ul>
<li>CreateZipArchiveObject: Which creates a System.IO.Compression.ZipArchive on a server side file</li>
<li>AddFileToZipArchive: Which adds a server side file to the archive using System.IO.Compression.ZipFileExtensions.CreateEntryFromFile(). This function allows to use arbitrary naming and does not require to create a server directory before creating the ZIP achieve.</li>
<li>CloseZipArhive: Which simply closes the ZIP file and saves it to disk.</li>
</ul>
<p>The pattern is integrated into the report/codeunit in question by providing a filename field on the request page if it is on WinClient but hidden if it is in Web client. On the Web client, a meaningful default filename is used for the file to download, e.g. in Code 1, Filename is set by the user on the request page if it is WinClient, and set to a default value in Web client.</p>
<h2 id=nav-usages>NAV Usages</h2>
<p>This pattern is used by VAT Report and Blacklist communication in the Italian localization in NAV 2015. The ZIP archive functions are available on all localization from NAV 2015.</p>
<h2 id=consequences>Consequences</h2>
<p>This pattern can be used whenever you need to ZIP one or more files. The above example downloads the file, but it could have been transmitted, saved to a persistent storage etc. It could also be used to improve download speed between server and client where the WinClient would unzip the files locally and save individually to disk. This follows the normal procedure in NAV in the WinClient, which is to download files directly to disk, so a ZIP file should only be created when the user specifically needs it or the Web client is invoking the report/codeunit.</p>
<h2 id=related-topics>Related Topics</h2>
<p>File Management</p>
<h2 id=references>References</h2>
<p><a href=http://msdn.microsoft.com/en-us/library/vstudio/system.io.compression.zipfile>System.IO.Compression.ZipFile</a></p>
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