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        <h1>Deleting Structured Objects</h1><div id="TOC"><div id="TOCinner"><span class="TOCtitle">Contents</span><div class="TOCcontents"><ul><li><a href ="#Recursive Deletion&nbsp;">Recursive Deletion&nbsp;</a></li><li><a href ="#Recursive Deletion Revisited">Recursive Deletion Revisited</a></li></ul></li></ul></div></div></div><script>
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<p>As we have already seen, we call delete() on objects to get rid of them.</p>



<span name="cs_wiki_filter" csw_filters="cs">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.cs: <span class="fscMemberName">DeleteFlat</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62"><div><!--

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--><span style="color: #008080;">1</span><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> DeleteFlat(IObjectContainer db)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Open_Text').style.display='inline';"/>    </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteFlat_136_62_54_224_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      IObjectSet result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">Ferrari</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">));
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      Car found </span><span style="color: #000000;">=</span><span style="color: #000000;"> (Car)result.Next();
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      db.Delete(found);
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #0000FF;">null</span><span style="color: #000000;">));
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      ListResult(result);
</span><span style="color: #008080;">8</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>    }</span></span></div></pre></div></div>
<p>[/filter] </p>

<p><span name="cs_wiki_filter" csw_filters="vb"></p>
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.vb: <span class="fscMemberName">DeleteFlat</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62"><div><!--

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--><span style="color: #008080;">1</span><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub DeleteFlat()</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteFlat_275_62_15_309_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> DeleteFlat(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> result </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectSet </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">Ferrari</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">))
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> found </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">DirectCast</span><span style="color: #000000;">(result.Next(), Car)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            db.Delete(found)
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #0000FF;">Nothing</span><span style="color: #000000;">))
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            ListResult(result)
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>        </span><span style="color: #0000FF;">End Sub</span></span></div></pre></div></div>
</span>

<p>Fine, the car is gone. What about the pilots?</p>




<span name="cs_wiki_filter" csw_filters="cs">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.cs: <span class="fscMemberName">RetrieveAllPilotsQBE</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72"><div><!--

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--><span style="color: #008080;">1</span><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> RetrieveAllPilotsQBE(IObjectContainer db)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Open_Text').style.display='inline';"/>    </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilotsQBE_459_72_64_167_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      Pilot proto </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Pilot(</span><span style="color: #0000FF;">null</span><span style="color: #000000;">, </span><span style="color: #800080;">0</span><span style="color: #000000;">);
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      IObjectSet result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(proto);
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      ListResult(result);
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>    }</span></span></div></pre></div></div>
<p></span> </p>

<p><span name="cs_wiki_filter" csw_filters="vb"></p>
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.vb: <span class="fscMemberName">RetrieveAllPilotsQBE</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72"><div><!--

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--><span style="color: #008080;">1</span><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub RetrieveAllPilotsQBE()</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilotsQBE_606_72_15_224_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> RetrieveAllPilotsQBE(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> proto </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Pilot(</span><span style="color: #0000FF;">Nothing</span><span style="color: #000000;">, </span><span style="color: #800080;">0</span><span style="color: #000000;">)
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> result </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectSet </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(proto)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            ListResult(result)
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>        </span><span style="color: #0000FF;">End Sub</span></span></div></pre></div></div>
</span>

<p>Ok, this is no real surprise - we don't expect a pilot to vanish when his&nbsp;car is 
disposed of in real life, too. But what if we want an object's children&nbsp;to be 
thrown away on deletion, too?</p>
<a name="Recursive Deletion&nbsp;"></a><h2>Recursive Deletion&nbsp;</h2>
<p>The problem of recursive deletion (and its 
solution, too) is quite similar to the <a href="updating_structured_objects.html" class="wikiLink">update</a> problem. Let's configure db4o to delete a car's pilot, too, when the car is deleted.</p>




<span name="cs_wiki_filter" csw_filters="cs">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.cs: <span class="fscMemberName">DeleteDeepPart1</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67"><div><!--

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--><span style="color: #008080;">1</span><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> IConfiguration DeleteDeepPart1()
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Open_Text').style.display='inline';"/>    </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart1_1208_67_50_229_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            IConfiguration configuration </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.NewConfiguration();
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      configuration.ObjectClass(</span><span style="color: #0000FF;">typeof</span><span style="color: #000000;">(Car)).CascadeOnDelete(</span><span style="color: #0000FF;">true</span><span style="color: #000000;">);
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">return</span><span style="color: #000000;"> configuration;
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>    }</span></span></div></pre></div></div>
<p></span> </p>

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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.vb: <span class="fscMemberName">DeleteDeepPart1</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67"><div><!--

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--><span style="color: #008080;">1</span><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Function DeleteDeepPart1()</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart1_1350_67_15_296_Open_Text"><span style="color: #0000FF;">Function</span><span style="color: #000000;"> DeleteDeepPart1(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer) </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IConfiguration
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> configuration </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IConfiguration </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.NewConfiguration()
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            configuration.ObjectClass(</span><span style="color: #0000FF;">GetType</span><span style="color: #000000;">(Car)).CascadeOnDelete(</span><span style="color: #0000FF;">True</span><span style="color: #000000;">)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Return</span><span style="color: #000000;"> configuration
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>        </span><span style="color: #0000FF;">End Function</span></span></div></pre></div></div>
</span>



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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.cs: <span class="fscMemberName">DeleteDeepPart2</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67"><div><!--

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--><span style="color: #008080;">1</span><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> DeleteDeepPart2(IObjectContainer db)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Open_Text').style.display='inline';"/>    </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepPart2_1481_67_59_225_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      IObjectSet result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">BMW</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">));
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      Car found </span><span style="color: #000000;">=</span><span style="color: #000000;"> (Car)result.Next();
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      db.Delete(found);
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #0000FF;">null</span><span style="color: #000000;">));
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      ListResult(result);
</span><span style="color: #008080;">8</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>    }</span></span></div></pre></div></div>
<p></span> </p>

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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.vb: <span class="fscMemberName">DeleteDeepPart2</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67"><div><!--

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--><span style="color: #008080;">1</span><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub DeleteDeepPart2()</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepPart2_1623_67_15_310_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> DeleteDeepPart2(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> result </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectSet </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">BMW</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">))
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> found </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">DirectCast</span><span style="color: #000000;">(result.Next(), Car)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            db.Delete(found)
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #0000FF;">Nothing</span><span style="color: #000000;">))
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            ListResult(result)
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>        </span><span style="color: #0000FF;">End Sub</span></span></div></pre></div></div>
</span>

<p>Again: Note that all configuration must take place before the ObjectContainer is 
opened.</p><p>Another way to organize cascaded deletion is using <a href="../../implementation_strategies/callbacks/possible_usecases/cascaded_behavior.html" class="wikiLink">callbacks</a>. The callbacks allow you to specify explicitly, which objects are to be deleted.<br></p>
<a name="Recursive Deletion Revisited"></a><h2>Recursive Deletion Revisited</h2>
<p>But wait - what happens if the children of a removed object are still referenced 
by&nbsp;other objects?</p>



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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.cs: <span class="fscMemberName">DeleteDeepRevisited</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71"><div><!--

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--><span style="color: #008080;">01</span><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> DeleteDeepRevisited(IObjectContainer db)
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Open_Text').style.display='inline';"/>    </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_DeleteDeepRevisited_2245_71_63_396_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      IObjectSet result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Pilot(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">Michael Schumacher</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">, </span><span style="color: #800080;">0</span><span style="color: #000000;">));
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      Pilot pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> (Pilot)result.Next();
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      Car car1 </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">Ferrari</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">);
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      Car car2 </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">BMW</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">);
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      car1.Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> pilot;
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      car2.Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> pilot;
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      db.Set(car1);
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      db.Set(car2);
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      db.Delete(car2);
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #0000FF;">null</span><span style="color: #000000;">));
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      ListResult(result);
</span><span style="color: #008080;">14</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>    }</span></span></div></pre></div></div>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.vb: <span class="fscMemberName">DeleteDeepRevisited</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71"><div><!--

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--><span style="color: #008080;">01</span><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub DeleteDeepRevisited()</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_DeleteDeepRevisited_2391_71_15_543_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> DeleteDeepRevisited(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> result </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectSet </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Pilot(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">Michael Schumacher</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">, </span><span style="color: #800080;">0</span><span style="color: #000000;">))
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> pilot </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">DirectCast</span><span style="color: #000000;">(result.Next(), Pilot)
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> car1 </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">Ferrari</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">)
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> car2 </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">&quot;</span><span style="color: #800000;">BMW</span><span style="color: #800000;">&quot;</span><span style="color: #000000;">)
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            car1.Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> pilot
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            car2.Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> pilot
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            db.Set(car1)
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            db.Set(car2)
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            db.Delete(car2)
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            result </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #0000FF;">Nothing</span><span style="color: #000000;">))
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            ListResult(result)
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>        </span><span style="color: #0000FF;">End Sub</span></span></div></pre></div></div>
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<span name="cs_wiki_filter" csw_filters="cs">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.cs: <span class="fscMemberName">RetrieveAllPilots</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69"><div><!--

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--><span style="color: #008080;">1</span><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> RetrieveAllPilots(IObjectContainer db) 
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Open_Text').style.display='inline';"/>    </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredCS.ZipsStructuredExample.Cs_StructuredExample.Cs_RetrieveAllPilots_2526_69_62_138_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      IObjectSet results </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">typeof</span><span style="color: #000000;">(Pilot));
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>      ListResult(results);
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>    }</span></span></div></pre></div></div>
<p></span> </p>

<p>[filter=vb]</p>
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">StructuredExample.vb: <span class="fscMemberName">RetrieveAllPilots</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69"><div><!--

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--><span style="color: #008080;">1</span><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub RetrieveAllPilots()</span><span id="ResourcesReferenceObject_LifecycleWorking_With_Structured_ObjectsstructuredVB.ZipsStructuredExample.Vb_StructuredExample.Vb_RetrieveAllPilots_2636_69_15_177_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> RetrieveAllPilots(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> results </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectSet </span><span style="color: #000000;">=</span><span style="color: #000000;"> db.Get(</span><span style="color: #0000FF;">GetType</span><span style="color: #000000;">(Pilot))
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>            ListResult(results)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>        </span><span style="color: #0000FF;">End Sub</span></span></div></pre></div></div>
</span>

<p>Currently db4o does <b>not</b> check whether objects to be deleted are 
referenced anywhere&nbsp;else, so please be very careful when using this 
feature.However it is fairly easy to implement referential checking on 
deletion using deleting() callback. See <a href="../../implementation_strategies/callbacks.html" class="wikiLink">Callbacks chapter</a> for more 
information.</p></div>
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