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<html><head><meta http-equiv="X-UA-Compatible" content="IE=edge" /><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" /><script type="text/javascript" src="../scripts/branding.js"> </script><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>DryadLinqExtension.MapReduce(TSource, TMap, TKey, TResult) Method </title><meta name="Language" content="en-us" /><meta name="System.Keywords" content="MapReduce%3CTSource%2C TMap%2C TKey%2C TResult%3E method" /><meta name="System.Keywords" content="MapReduce(Of TSource%2C TMap%2C TKey%2C TResult) method" /><meta name="System.Keywords" content="DryadLinqExtension.MapReduce%3CTSource%2C TMap%2C TKey%2C TResult%3E method" /><meta name="System.Keywords" content="DryadLinqExtension.MapReduce(Of TSource%2C TMap%2C TKey%2C TResult) method" /><meta name="Microsoft.Help.F1" content="Microsoft.Research.DryadLinq.DryadLinqExtension.MapReduce``4" /><meta name="Microsoft.Help.Id" content="M:Microsoft.Research.DryadLinq.DryadLinqExtension.MapReduce``4(System.Linq.IQueryable{``0},System.Linq.Expressions.Expression{System.Func{``0,System.Collections.Generic.IEnumerable{``1}}},System.Linq.Expressions.Expression{System.Func{``1,``2}},System.Linq.Expressions.Expression{System.Func{``2,System.Collections.Generic.IEnumerable{``1},``3}})" /><meta name="Description" content="The standard MapReduce." /><meta name="Microsoft.Help.ContentType" content="Reference" /><meta name="BrandingAware" content="true" /><meta name="container" content="Microsoft.Research.DryadLinq" /><meta name="file" content="6613acc6-d94d-28ed-f5ce-28ad5967f7f0" /><meta name="guid" content="6613acc6-d94d-28ed-f5ce-28ad5967f7f0" /></head><body onload="OnLoad('cs')"><input type="hidden" id="userDataCache" class="userDataStyle" /><div class="OH_outerDiv"><div class="OH_outerContent"><table class="TitleTable"><tr><td class="OH_tdTitleColumn">DryadLinqExtension<span id="LST3BBB849E_0"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_0?cpp=::|nu=.");</script>MapReduce<span id="LST3BBB849E_1"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_1?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="typeparameter">TSource</span>, <span class="typeparameter">TMap</span>, <span class="typeparameter">TKey</span>, <span class="typeparameter">TResult</span><span id="LST3BBB849E_2"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_2?cs=>|vb=)|cpp=>|fs=>|nu=)");</script> Method </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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The standard MapReduce.
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</div><p> </p><strong>Namespace:</strong> <a href="efe6507e-9fd8-bbd3-8227-fd6ba9e289c1.htm">Microsoft.Research.DryadLinq</a><br /><strong>Assembly:</strong> Microsoft.Research.DryadLinq (in Microsoft.Research.DryadLinq.dll) Version: 0.1.5.0 (0.1.5.0)<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 class="OH_CodeSnippetContainer"><div class="OH_CodeSnippetContainerTabs"><div class="OH_CodeSnippetContainerTabLeft" id="ID0ECCA_tabimgleft"> </div><div id="ID0ECCA_tab1" class="OH_CodeSnippetContainerTabFirst"><a href="#" onclick="javascript:ChangeTab('ID0ECCA','cs','1','3');return false;">C#</a></div><div id="ID0ECCA_tab2" class="OH_CodeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0ECCA','vb','2','3');return false;">VB</a></div><div id="ID0ECCA_tab3" class="OH_CodeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0ECCA','cpp','3','3');return false;">C++</a></div><div class="OH_CodeSnippetContainerTabRight" id="ID0ECCA_tabimgright"> </div></div><div class="OH_CodeSnippetContainerCodeCollection"><div class="OH_CodeSnippetToolBar"><div class="OH_CodeSnippetToolBarText"><a id="ID0ECCA_copyCode" href="#" onclick="javascript:CopyToClipboard('ID0ECCA');return false;" title="Copy">Copy</a></div></div><div id="ID0ECCA_code_Div1" class="OH_CodeSnippetContainerCode" style="display: block"><pre xml:space="preserve"><span class="keyword">public</span> <span class="keyword">static</span> <span class="identifier">IQueryable</span><TResult> <span class="identifier">MapReduce</span><TSource, TMap, 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, <span class="identifier">IEnumerable</span><TMap>>> <span class="parameter">mapper</span>,
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<span class="identifier">Expression</span><<span class="identifier">Func</span><TMap, TKey>> <span class="parameter">keySelector</span>,
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<span class="identifier">Expression</span><<span class="identifier">Func</span><TKey, <span class="identifier">IEnumerable</span><TMap>, TResult>> <span class="parameter">reducer</span>
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)
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</pre></div><div id="ID0ECCA_code_Div2" class="OH_CodeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><<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">MapReduce</span>(<span class="keyword">Of</span> TSource, TMap, 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">mapper</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, <span class="identifier">IEnumerable</span>(<span class="keyword">Of</span> TMap))),
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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> TMap, TKey)),
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<span class="parameter">reducer</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> TKey, <span class="identifier">IEnumerable</span>(<span class="keyword">Of</span> TMap), 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="ID0ECCA_code_Div3" class="OH_CodeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><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> TMap, <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">MapReduce</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, <span class="identifier">IEnumerable</span><TMap>^>^>^ <span class="parameter">mapper</span>,
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<span class="identifier">Expression</span><<span class="identifier">Func</span><TMap, TKey>^>^ <span class="parameter">keySelector</span>,
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<span class="identifier">Expression</span><<span class="identifier">Func</span><TKey, <span class="identifier">IEnumerable</span><TMap>^, TResult>^>^ <span class="parameter">reducer</span>
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)</pre></div></div></div><script type="text/javascript">AddLanguageTabSet("ID0ECCA");</script><h4 class="subHeading">Parameters</h4><dl><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="LST3BBB849E_3"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_3?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>IQueryable</a><span id="LST3BBB849E_4"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_4?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="selflink"><span class="typeparameter">TSource</span></span><span id="LST3BBB849E_5"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_5?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><br />The input dataset</dd><dt><span class="parameter">mapper</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/bb335710" target="_blank">System.Linq.Expressions<span id="LST3BBB849E_6"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_6?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>Expression</a><span id="LST3BBB849E_7"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_7?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><a href="http://msdn2.microsoft.com/en-us/library/bb549151" target="_blank">Func</a><span id="LST3BBB849E_8"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_8?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="selflink"><span class="typeparameter">TSource</span></span>, <a href="http://msdn2.microsoft.com/en-us/library/9eekhta0" target="_blank">IEnumerable</a><span id="LST3BBB849E_9"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_9?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="selflink"><span class="typeparameter">TMap</span></span><span id="LST3BBB849E_10"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_10?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><span id="LST3BBB849E_11"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_11?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><span id="LST3BBB849E_12"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_12?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><br />The map function</dd><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="LST3BBB849E_13"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_13?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>Expression</a><span id="LST3BBB849E_14"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_14?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><a href="http://msdn2.microsoft.com/en-us/library/bb549151" target="_blank">Func</a><span id="LST3BBB849E_15"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_15?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="selflink"><span class="typeparameter">TMap</span></span>, <span class="selflink"><span class="typeparameter">TKey</span></span><span id="LST3BBB849E_16"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_16?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><span id="LST3BBB849E_17"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_17?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><br />The key extraction function</dd><dt><span class="parameter">reducer</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/bb335710" target="_blank">System.Linq.Expressions<span id="LST3BBB849E_18"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_18?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>Expression</a><span id="LST3BBB849E_19"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_19?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><a href="http://msdn2.microsoft.com/en-us/library/bb534647" target="_blank">Func</a><span id="LST3BBB849E_20"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_20?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="selflink"><span class="typeparameter">TKey</span></span>, <a href="http://msdn2.microsoft.com/en-us/library/9eekhta0" target="_blank">IEnumerable</a><span id="LST3BBB849E_21"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_21?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="selflink"><span class="typeparameter">TMap</span></span><span id="LST3BBB849E_22"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_22?cs=>|vb=)|cpp=>|fs=>|nu=)");</script>, <span class="selflink"><span class="typeparameter">TResult</span></span><span id="LST3BBB849E_23"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_23?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><span id="LST3BBB849E_24"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_24?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><br />The reduce function</dd></dl><h4 class="subHeading">Type Parameters</h4><dl><dt><span class="parameter">TSource</span></dt><dd>The type of the records of input dataset</dd><dt><span class="parameter">TMap</span></dt><dd>The type of the resulting records of mapper</dd><dt><span class="parameter">TKey</span></dt><dd>The type of the keys for hash exchange</dd><dt><span class="parameter">TResult</span></dt><dd>The type of the resulting records of reducer</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="LST3BBB849E_25"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_25?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="selflink"><span class="typeparameter">TResult</span></span><span id="LST3BBB849E_26"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_26?cs=>|vb=)|cpp=>|fs=>|nu=)");</script><br />The result dataset of MapReduce<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="LST3BBB849E_27"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_27?cs=<|vb=(Of |cpp=<|fs=<'|nu=(");</script><span class="selflink"><span class="typeparameter">TSource</span></span><span id="LST3BBB849E_28"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3BBB849E_28?cs=>|vb=)|cpp=>|fs=>|nu=)");</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>.<div class="OH_CollapsibleAreaRegion" id="seeAlsoSection"><div class="OH_regiontitle">See Also</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"> </div><h4 class="subHeading">Reference</h4><div class="seeAlsoStyle"><a href="d83d6168-067a-d431-aaf5-3d9515eff360.htm">DryadLinqExtension Class</a></div><div class="seeAlsoStyle"><a href="efe6507e-9fd8-bbd3-8227-fd6ba9e289c1.htm">Microsoft.Research.DryadLinq Namespace</a></div></div></div></div></div><div id="OH_footer" class="OH_footer"> </div></body></html> |