<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="2" MadCap:lastHeight="120" MadCap:lastWidth="624" MadCap:disableMasterStylesheet="true" MadCap:tocPath="Basics Operations & Concepts|Delete Behavior" MadCap:InPreviewMode="false" MadCap:RuntimeFileType="Topic" MadCap:TargetType="WebHelp" MadCap:PathToHelpSystem="../../../" MadCap:HelpSystemFileName="index.xml" MadCap:SearchType="Stem"> <head><title>Collections And Arrays</title> <script type="text/javascript">/* <![CDATA[ */ window.onload = function(){ var pathToFlash = $('html').attr('MadCap:PathToHelpSystem') + 'Content/Resources/Code/ZeroClipboard.swf'; ZeroClipboard.setMoviePath(pathToFlash); function bindToClipBord(element,content){ var clip = new ZeroClipboard.Client(); clip.setText(content); clip.glue(element); }; if(location.protocol==='file:'){ $('.copylink-marker').remove(); } else{ $('.copylink-marker').each(function(){ var text = $(this).parent().parent().children('.prettyprint').html(); $(this).hover(function(){ bindToClipBord(this,text); }, function(){}); }); } prettyPrint(); }; /* ]]> */</script> <link href="../../SkinSupport/MadCap.css" rel="stylesheet" /> <link href="../../Resources/Stylesheets/OnlineStyle.css" rel="stylesheet" /> <script src="../../Resources/Code/prettify.js"> </script> <script src="../../Resources/Code/lang-vb.js"> </script> <script src="../../Resources/Code/jquery.min.js"> </script> <script src="../../Resources/Code/ZeroClipboard.js"> </script> <script src="../../SkinSupport/MadCapAll.js" type="text/javascript"> </script> </head> <body> <p class="MCWebHelpFramesetLink" style="display: none;"><a href="../../../index_CSH.html#basics/delete_behavior/collections.htm" style="">Open topic with navigation</a> </p> <div class="MCBreadcrumbsBox"><span class="MCBreadcrumbsPrefix">You are here: </span><a class="MCBreadcrumbsLink" href="../../basics.htm">Basics Operations & Concepts</a><span class="MCBreadcrumbsDivider"> > </span><a class="MCBreadcrumbsLink" href="../delete_behavior.htm">Delete Behavior</a><span class="MCBreadcrumbsDivider"> > </span><span class="MCBreadcrumbs">Collections And Arrays</span> </div> <p> <script type="text/javascript">/*<![CDATA[*/document.write('<a href="' + location.href +'">'); document.write("Direct Link"); document.write('</a>');/*]]>*/</script> </p> <p> </p> <h1>Collections And Arrays</h1> <p>Collections and arrays don't have a special behavior in db4o. When you delete a collection, the collection-members are not deleted. The collection and objects are two independent objects for db4o. </p> <h2>Removing From A Collection</h2> <p>To remove object from a collection you can simple use the regular collection-operations and then store that collection. </p> <div class="codesnippet" MadCap:conditions="Primary.c#"> <pre class="prettyprint" xml:space="preserve">PilotGroup group = FindGroup(container); Pilot pilot = group.Pilots[0]; group.Pilots.Remove(pilot); container.Store(group.Pilots); AssertEquals(3, AllPilots(container).Count); AssertEquals(2, group.Pilots.Count);</pre> <div class="codesnippet-meta">DeletionExamples.cs: Removing from a collection doesn't delete the collection-members <div class="codedownload"><a href="../../CodeExamples/deletion/Example-Code-deletion-csharp.zip" class="codedownload" MadCap:conditions="Primary.Online">Download Code</a></div><div class="codedownload copylink-marker" MadCap:conditions="Primary.Online"><a href="#copy">Copy Code</a></div></div> </div> <div class="codesnippet" MadCap:conditions="Primary.VB.NET"> <pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Dim group As PilotGroup = FindGroup(container) Dim pilot As Pilot = group.Pilots(0) group.Pilots.Remove(pilot) container.Store(group.Pilots) AssertEquals(3, AllPilots(container).Count) AssertEquals(2, group.Pilots.Count)</pre> <div class="codesnippet-meta">DeletionExamples.vb: Removing from a collection doesn't delete the collection-members <div class="codedownload"><a href="../../CodeExamples/deletion/Example-Code-deletion-vb.zip" class="codedownload" MadCap:conditions="Primary.Online">Download Code</a></div><div class="codedownload copylink-marker" MadCap:conditions="Primary.Online"><a href="#copy">Copy Code</a></div></div> </div> <h2>Remove And Delete Collection Members</h2> <p>If you want to delete a collection-member, remove it and then delete it.</p> <div class="codesnippet" MadCap:conditions="Primary.c#"> <pre class="prettyprint" xml:space="preserve">PilotGroup group = FindGroup(container); Pilot pilot = group.Pilots[0]; group.Pilots.Remove(pilot); container.Store(group.Pilots); container.Delete(pilot); AssertEquals(2, AllPilots(container).Count); AssertEquals(2, group.Pilots.Count);</pre> <div class="codesnippet-meta">DeletionExamples.cs: Remove and delete <div class="codedownload"><a href="../../CodeExamples/deletion/Example-Code-deletion-csharp.zip" class="codedownload" MadCap:conditions="Primary.Online">Download Code</a></div><div class="codedownload copylink-marker" MadCap:conditions="Primary.Online"><a href="#copy">Copy Code</a></div></div> </div> <div class="codesnippet" MadCap:conditions="Primary.VB.NET"> <pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Dim group As PilotGroup = FindGroup(container) Dim pilot As Pilot = group.Pilots(0) group.Pilots.Remove(pilot) container.Store(group.Pilots) container.Delete(pilot) AssertEquals(2, AllPilots(container).Count) AssertEquals(2, group.Pilots.Count)</pre> <div class="codesnippet-meta">DeletionExamples.vb: Remove and delete <div class="codedownload"><a href="../../CodeExamples/deletion/Example-Code-deletion-vb.zip" class="codedownload" MadCap:conditions="Primary.Online">Download Code</a></div><div class="codedownload copylink-marker" MadCap:conditions="Primary.Online"><a href="#copy">Copy Code</a></div></div> </div> <script type="text/javascript" src="../../SkinSupport/MadCapBodyEnd.js"> </script> </body> </html>