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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 0.107.0"><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>Multi-file Download | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="By Martin Dam at Microsoft Development Center Copenhagen
<!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 0.110.0"><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>Multi-file Download | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="By Martin Dam at Microsoft Development Center Copenhagen
Abstract
The goal of this pattern is to enable the users to download multiple files as a zip …"><meta property="og:title" content="Multi-file Download"><meta property="og:description" content="By Martin Dam at Microsoft Development Center Copenhagen
Abstract 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.
@ -44,7 +44,7 @@ Description When generating reports that consists of multiple, and usually an un
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>EXIT</span><span style=color:#ce5c00;font-weight:700>(</span>Directory<span style=color:#f8f8f8;text-decoration:underline> </span>+<span style=color:#f8f8f8;text-decoration:underline> </span>FileMgt<span style=color:#ce5c00;font-weight:700>.</span>GetFileNameWithoutExtension<span style=color:#ce5c00;font-weight:700>(</span>FileName<span style=color:#ce5c00;font-weight:700>) </span>+<span style=color:#f8f8f8;text-decoration:underline> </span>FORMAT<span style=color:#ce5c00;font-weight:700>(</span>FileNo<span style=color:#ce5c00;font-weight:700>) </span>+<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#4e9a06>&#39;.&#39;</span><span style=color:#f8f8f8;text-decoration:underline> </span>+<span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>FileMgt<span style=color:#ce5c00;font-weight:700>.</span>GetExtension<span style=color:#ce5c00;font-weight:700>(</span>FileName<span style=color:#ce5c00;font-weight:700>))</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span></code></pre></div><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>CloseZipArchive: 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><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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