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119 lines
20 KiB
HTML
<html xmlns:MSHelp="http://msdn.microsoft.com/mshelp" xmlns:mshelp="http://msdn.microsoft.com/mshelp"><head><link rel="SHORTCUT ICON" href="./../icons/favicon.ico" /><style type="text/css">.OH_CodeSnippetContainerTabLeftActive, .OH_CodeSnippetContainerTabLeft,.OH_CodeSnippetContainerTabLeftDisabled { }.OH_CodeSnippetContainerTabRightActive, .OH_CodeSnippetContainerTabRight,.OH_CodeSnippetContainerTabRightDisabled { }.OH_footer { }</style><link rel="stylesheet" type="text/css" href="./../styles/branding.css" /><link rel="stylesheet" type="text/css" href="./../styles/branding-en-US.css" /><style type="text/css">
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</style><script src="./../scripts/branding.js" type="text/javascript"><!----></script><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>DryadLinqQueryable.HashPartition(TSource, TKey, TResult) Method (IQueryable(TSource), Expression(Func(TSource, TKey)), IEqualityComparer(TKey), Expression(Func(TSource, TResult)))</title><meta name="Language" content="en-us" /><meta name="Microsoft.Help.Id" content="M:Microsoft.Research.DryadLinq.DryadLinqQueryable.HashPartition``3(System.Linq.IQueryable{``0},System.Linq.Expressions.Expression{System.Func{``0,``1}},System.Collections.Generic.IEqualityComparer{``1},System.Linq.Expressions.Expression{System.Func{``0,``2}})" /><meta name="Description" content="Hash partition a dataset. The number of resulting partitions is dynamically determined at the runtime." /><meta name="Microsoft.Help.ContentType" content="Reference" /><meta name="BrandingAware" content="'true'" /><meta name="container" content="Microsoft.Research.DryadLinq" /><meta name="file" content="ee049bec-6bfb-fb7f-3707-a411d85f477a" /><meta name="guid" content="ee049bec-6bfb-fb7f-3707-a411d85f477a" /><meta name="SelfBranded" content="true" /></head><body onload="onLoad()" class="primary-mtps-offline-document"><div class="OH_outerDiv"><div class="OH_outerContent"><table class="TitleTable"><tr><td class="OH_tdTitleColumn">DryadLinqQueryable<span id="ID0E0DB0BABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0E0DB0BABAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
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</script>HashPartition<span id="ID0E0BB0BABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0E0BB0BABAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="typeparameter">TSource</span>, <span class="typeparameter">TKey</span>, <span class="typeparameter">TResult</span><span id="ID0E2BABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0E2BABAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script> Method (IQueryable<span id="ID0EZBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EZBABAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="typeparameter">TSource</span><span id="ID0EXBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EXBABAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script>, Expression<span id="ID0EVBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EVBABAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script>Func<span id="ID0ETBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0ETBABAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="typeparameter">TSource</span>, <span class="typeparameter">TKey</span><span id="ID0EPBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EPBABAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><span id="ID0EOBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EOBABAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script>, IEqualityComparer<span id="ID0EMBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EMBABAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="typeparameter">TKey</span><span id="ID0EKBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EKBABAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script>, Expression<span id="ID0EIBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EIBABAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script>Func<span id="ID0EGBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EGBABAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="typeparameter">TSource</span>, <span class="typeparameter">TResult</span><span id="ID0ECBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0ECBABAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><span id="ID0EBBABAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EBBABAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script>)</td><td class="OH_tdRunningTitleColumn">DryadLINQ documentation</td></tr></table><div id="mainSection"><div id="mainBody"><span class="introStyle"></span><div class="summary">
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Hash partition a dataset. The number of resulting partitions is dynamically determined
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at the runtime.
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</div><p></p><strong>Namespace:</strong> <a href="efe6507e-9fd8-bbd3-8227-fd6ba9e289c1.htm" target="">Microsoft.Research.DryadLinq</a><br /><strong>Assembly:</strong> <span sdata="assembly">Microsoft.Research.DryadLinq</span> (in Microsoft.Research.DryadLinq.dll) Version: 0.1.2.0 (0.1.2.0)<div class="OH_CollapsibleAreaRegion"><div class="OH_regiontitle">Syntax</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"></div><div id="snippetGroup_Syntax" class="code"><div id="ID0ECVCAAAAA" class="OH_CodeSnippetContainer"><div class="OH_CodeSnippetContainerTabs" id="ID0ECVCAAAAA_tabs"><div class="OH_CodeSnippetContainerTabLeftActive" id="ID0ECVCAAAAA_tabimgleft"></div><div id="ID0ECVCAAAAA_tab1" class="OH_CodeSnippetContainerTabActive" EnableCopyCode="true"><a href="#" onclick="javascript:ChangeTab('ID0ECVCAAAAA','C#','1','4');return false;">C#</a></div><div id="ID0ECVCAAAAA_tab2" class="OH_CodeSnippetContainerTab" EnableCopyCode="true"><a href="#" onclick="javascript:ChangeTab('ID0ECVCAAAAA','Visual Basic','2','4');return false;">VB</a></div><div id="ID0ECVCAAAAA_tab3" class="OH_CodeSnippetContainerTab" EnableCopyCode="true"><a href="#" onclick="javascript:ChangeTab('ID0ECVCAAAAA','Visual C++','3','4');return false;">C++</a></div><div id="ID0ECVCAAAAA_tab4" class="OH_CodeSnippetContainerTabDisabledNotFirst" EnableCopyCode="true" disabled="true"><a>F#</a></div><div class="OH_CodeSnippetContainerTabRight" id="ID0ECVCAAAAA_tabimgright"></div></div><div id="ID0ECVCAAAAA_codecollection" class="OH_CodeSnippetContainerCodeCollection"><div class="OH_CodeSnippetToolBar"><div class="OH_CodeSnippetToolBarText"><a id="ID0ECVCAAAAA_ViewColorized" href="#" onclick="javascript:ExchangeTitleContent('ID0ECVCAAAAA','4')" title="View Colorized" style="display: none">View Colorized</a><a id="ID0ECVCAAAAA_copycode" href="#" onclick="javascript:CopyToClipboard('ID0ECVCAAAAA','4')" title="Copy to Clipboard">Copy to Clipboard</a><a id="ID0ECVCAAAAA_PrintText" class="OH_PrintText" href="#" onclick="javascript:Print('ID0ECVCAAAAA','4')" title="Print">Print</a></div></div><div id="ID0ECVCAAAAA_code_Div1" class="OH_CodeSnippetContainerCode" style="display: block"><pre><span class="keyword">public</span> <span class="keyword">static</span> <span class="identifier">IQueryable</span><TResult> <span class="identifier">HashPartition</span><TSource, TKey, TResult>(
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<span class="keyword">this</span> <span class="identifier">IQueryable</span><TSource> <span class="parameter">source</span>,
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<span class="identifier">Expression</span><<span class="identifier">Func</span><TSource, TKey>> <span class="parameter">keySelector</span>,
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<span class="identifier">IEqualityComparer</span><TKey> <span class="parameter">comparer</span>,
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<span class="identifier">Expression</span><<span class="identifier">Func</span><TSource, TResult>> <span class="parameter">resultSelector</span>
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)</pre></div><div id="ID0ECVCAAAAA_code_Plain_Div1" class="OH_CodeSnippetContainerCode" style="display: none"><pre>public static IQueryable<TResult> HashPartition<TSource, TKey, TResult>(
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this IQueryable<TSource> source,
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Expression<Func<TSource, TKey>> keySelector,
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IEqualityComparer<TKey> comparer,
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Expression<Func<TSource, TResult>> resultSelector
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)</pre></div><div id="ID0ECVCAAAAA_code_Div2" class="OH_CodeSnippetContainerCode" style="display: none"><pre><<span class="identifier">ExtensionAttribute</span>>
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<span class="keyword">Public</span> <span class="keyword">Shared</span> <span class="keyword">Function</span> <span class="identifier">HashPartition</span>(<span class="keyword">Of</span> TSource, TKey, TResult) (
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<span class="parameter">source</span> <span class="keyword">As</span> <span class="identifier">IQueryable</span>(<span class="keyword">Of</span> TSource),
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<span class="parameter">keySelector</span> <span class="keyword">As</span> <span class="identifier">Expression</span>(<span class="keyword">Of</span> <span class="identifier">Func</span>(<span class="keyword">Of</span> TSource, TKey)),
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<span class="parameter">comparer</span> <span class="keyword">As</span> <span class="identifier">IEqualityComparer</span>(<span class="keyword">Of</span> TKey),
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<span class="parameter">resultSelector</span> <span class="keyword">As</span> <span class="identifier">Expression</span>(<span class="keyword">Of</span> <span class="identifier">Func</span>(<span class="keyword">Of</span> TSource, TResult))
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) <span class="keyword">As</span> <span class="identifier">IQueryable</span>(<span class="keyword">Of</span> TResult)</pre></div><div id="ID0ECVCAAAAA_code_Plain_Div2" class="OH_CodeSnippetContainerCode" style="display: none"><pre><ExtensionAttribute>
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Public Shared Function HashPartition(Of TSource, TKey, TResult) (
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source As IQueryable(Of TSource),
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keySelector As Expression(Of Func(Of TSource, TKey)),
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comparer As IEqualityComparer(Of TKey),
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resultSelector As Expression(Of Func(Of TSource, TResult))
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) As IQueryable(Of TResult)</pre></div><div id="ID0ECVCAAAAA_code_Div3" class="OH_CodeSnippetContainerCode" style="display: none"><pre><span class="keyword">public</span>:
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[<span class="identifier">ExtensionAttribute</span>]
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<span class="keyword">generic</span><<span class="keyword">typename</span> TSource, <span class="keyword">typename</span> TKey, <span class="keyword">typename</span> TResult>
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<span class="keyword">static</span> <span class="identifier">IQueryable</span><TResult>^ <span class="identifier">HashPartition</span>(
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<span class="identifier">IQueryable</span><TSource>^ <span class="parameter">source</span>,
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<span class="identifier">Expression</span><<span class="identifier">Func</span><TSource, TKey>^>^ <span class="parameter">keySelector</span>,
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<span class="identifier">IEqualityComparer</span><TKey>^ <span class="parameter">comparer</span>,
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<span class="identifier">Expression</span><<span class="identifier">Func</span><TSource, TResult>^>^ <span class="parameter">resultSelector</span>
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)</pre></div><div id="ID0ECVCAAAAA_code_Plain_Div3" class="OH_CodeSnippetContainerCode" style="display: none"><pre>public:
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[ExtensionAttribute]
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generic<typename TSource, typename TKey, typename TResult>
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static IQueryable<TResult>^ HashPartition(
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IQueryable<TSource>^ source,
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Expression<Func<TSource, TKey>^>^ keySelector,
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IEqualityComparer<TKey>^ comparer,
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Expression<Func<TSource, TResult>^>^ resultSelector
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)</pre></div><div id="ID0ECVCAAAAA_code_Div4" class="OH_CodeSnippetContainerCode" style="display: none"><pre /></div><div id="ID0ECVCAAAAA_code_Plain_Div4" class="OH_CodeSnippetContainerCode" style="display: none"><pre /></div></div></div><script>addSpecificTextLanguageTagSet('ID0ECVCAAAAA');</script></div><div id="parameters"><h4 class="subHeading">Parameters</h4><dl paramName="source"><dt><span class="parameter">source</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/bb351562" target="_blank">System.Linq<span id="ID0EBFADUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EBFADUCAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
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</script>IQueryable</a><span id="ID0EEADUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EEADUCAAAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="selflink"><span class="typeparam">TSource</span></span><span id="ID0ECADUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0ECADUCAAAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><br /><span>The dataset to be partitioned</span></dd></dl><dl paramName="keySelector"><dt><span class="parameter">keySelector</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/bb335710" target="_blank">System.Linq.Expressions<span id="ID0EBKACUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EBKACUCAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
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</script>Expression</a><span id="ID0EJACUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EJACUCAAAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><a href="http://msdn2.microsoft.com/en-us/library/bb549151" target="_blank">Func</a><span id="ID0EHACUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EHACUCAAAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="selflink"><span class="typeparam">TSource</span></span>, <span class="selflink"><span class="typeparam">TKey</span></span><span id="ID0EDACUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EDACUCAAAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><span id="ID0ECACUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0ECACUCAAAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><br /><span>The function to extract the key from a record</span></dd></dl><dl paramName="comparer"><dt><span class="parameter">comparer</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/ms132151" target="_blank">System.Collections.Generic<span id="ID0EBFABUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EBFABUCAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
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</script>IEqualityComparer</a><span id="ID0EEABUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EEABUCAAAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="selflink"><span class="typeparam">TKey</span></span><span id="ID0ECABUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0ECABUCAAAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><br /><span>An IComparer on TKey to compare keys</span></dd></dl><dl paramName="resultSelector"><dt><span class="parameter">resultSelector</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/bb335710" target="_blank">System.Linq.Expressions<span id="ID0EBKAAUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EBKAAUCAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
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</script>Expression</a><span id="ID0EJAAUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EJAAUCAAAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><a href="http://msdn2.microsoft.com/en-us/library/bb549151" target="_blank">Func</a><span id="ID0EHAAUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EHAAUCAAAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="selflink"><span class="typeparam">TSource</span></span>, <span class="selflink"><span class="typeparam">TResult</span></span><span id="ID0EDAAUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EDAAUCAAAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><span id="ID0ECAAUCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0ECAAUCAAAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><br /><span>The function to compute output record</span></dd></dl></div><div class="OH_CollapsibleAreaRegion"><div class="OH_regiontitle">Type Parameters</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"></div><dl><dt><span class="parameter">TSource</span></dt><dd>The type of the records in the dataset</dd><dt><span class="parameter">TKey</span></dt><dd>The type of the key on which the partition is based</dd><dt><span class="parameter">TResult</span></dt><dd>The type of the records in the result dataset</dd></dl><h4 class="subHeading">Return Value</h4>Type: <a href="http://msdn2.microsoft.com/en-us/library/bb351562" target="_blank">IQueryable</a><span id="ID0EPCAAAAA"> </span><script type="text/javascript">
|
||
addToLanSpecTextIdSet("ID0EPCAAAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
|
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</script><span class="selflink"><span class="typeparam">TResult</span></span><span id="ID0ENCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0ENCAAAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script><br />An IQueryable hash-partitioned according to a key<h4 class="subHeading">Usage Note</h4>In Visual Basic and C#, you can call this method as an instance method on any object of type <a href="http://msdn2.microsoft.com/en-us/library/bb351562" target="_blank">IQueryable</a><span id="ID0EHCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EHCAAAAA?vb=(Of |cpp=<|cs=<|fs=<'|nu=(");
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</script><span class="selflink"><span class="typeparam">TSource</span></span><span id="ID0EFCAAAAA"> </span><script type="text/javascript">
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addToLanSpecTextIdSet("ID0EFCAAAAA?vb=)|cpp=>|cs=>|fs=>|nu=)");
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</script>. When you use instance method syntax to call this method, omit the first parameter. For more information, see <a href="http://msdn.microsoft.com/en-us/library/bb384936.aspx" target="_blank">Extension Methods (Visual Basic)</a> or <a href="http://msdn.microsoft.com/en-us/library/bb383977.aspx" target="_blank">Extension Methods (C# Programming Guide)</a>.<a name="seeAlsoSection"><!----></a><div class="OH_CollapsibleAreaRegion"><div class="OH_regiontitle">See Also</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"></div><div class="seeAlsoStyle"><a href="6d67ec6b-96ed-0a8b-0ad4-1c0568c7bf91.htm" target="">DryadLinqQueryable Class</a></div><div class="seeAlsoStyle"><a href="1d3ec0f6-3549-a859-323d-eaa072b59745.htm" target="">HashPartition Overload</a></div><div class="seeAlsoStyle"><a href="efe6507e-9fd8-bbd3-8227-fd6ba9e289c1.htm" target="">Microsoft.Research.DryadLinq Namespace</a></div></div></div></div></div><div id="OH_footer" class="OH_footer"><p /><div class="OH_feedbacklink"><a href="mailto:?subject=DryadLINQ+documentation+DryadLinqQueryable.HashPartition(TSource%2c+TKey%2c+TResult)+Method+(IQueryable(TSource)%2c+Expression(Func(TSource%2c+TKey))%2c+IEqualityComparer(TKey)%2c+Expression(Func(TSource%2c+TResult)))+100+EN-US&body=Your%20feedback%20is%20used%20to%20improve%20the%20documentation%20and%20the%20product.%20Your%20e-mail%20address%20will%20not%20be%20used%20for%20any%20other%20purpose%20and%20is%20disposed%20of%20after%20the%20issue%20you%20report%20is%20resolved.%20While%20working%20to%20resolve%20the%20issue%20that%20you%20report%2c%20you%20may%20be%20contacted%20via%20e-mail%20to%20get%20further%20details%20or%20clarification%20on%20the%20feedback%20you%20sent.%20After%20the%20issue%20you%20report%20has%20been%20addressed%2c%20you%20may%20receive%20an%20e-mail%20to%20let%20you%20know%20that%20your%20feedback%20has%20been%20addressed.">Send Feedback</a> on this topic.</div></div></body></html> |