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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.QueryUtils">
<h1 id="Lucene_Net_Search_QueryUtils" data-uid="Lucene.Net.Search.QueryUtils" class="text-break">Class QueryUtils
</h1>
<div class="markdown level0 summary"><p>Utility class for sanity-checking queries.</p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><span class="xref">System.Object</span></div>
<div class="level1"><span class="xref">QueryUtils</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">System.Object.Equals(System.Object)</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.GetHashCode()</span>
</div>
<div>
<span class="xref">System.Object.GetType()</span>
</div>
<div>
<span class="xref">System.Object.MemberwiseClone()</span>
</div>
<div>
<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.ToString()</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Search.html">Lucene.Net.Search</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.TestFramework.dll</h6>
<h5 id="Lucene_Net_Search_QueryUtils_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static class QueryUtils</code></pre>
</div>
<h3 id="methods">Methods
</h3>
<span class="small pull-right mobile-hide">
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_QueryUtils_Check_Lucene_Net_Search_Query_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.QueryUtils.Check(Lucene.Net.Search.Query)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<a id="Lucene_Net_Search_QueryUtils_Check_" data-uid="Lucene.Net.Search.QueryUtils.Check*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_Check_Lucene_Net_Search_Query_" data-uid="Lucene.Net.Search.QueryUtils.Check(Lucene.Net.Search.Query)">Check(Query)</h4>
<div class="markdown level1 summary"><p>Check the types of things query objects should be able to do. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void Check(Query q)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_QueryUtils_Check_System_Random_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.QueryUtils.Check(System.Random%2CLucene.Net.Search.Query%2CLucene.Net.Search.IndexSearcher)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<a id="Lucene_Net_Search_QueryUtils_Check_" data-uid="Lucene.Net.Search.QueryUtils.Check*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_Check_System_Random_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Search.QueryUtils.Check(System.Random,Lucene.Net.Search.Query,Lucene.Net.Search.IndexSearcher)">Check(Random, Query, IndexSearcher)</h4>
<div class="markdown level1 summary"><p>Various query sanity checks on a searcher, some checks are only done for
instance of <span class="xref">Lucene.Net.Search.IndexSearcher</span>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void Check(Random random, Query q1, IndexSearcher s)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Random</span></td>
<td><span class="parametername">random</span></td>
<td><p>A random instance (usually <a class="xref" href="Lucene.Net.Util.LuceneTestCase.html#Lucene_Net_Util_LuceneTestCase_Random">Random</a>).</p>
</td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q1</span></td>
<td><p>A <span class="xref">Lucene.Net.Search.Query</span>.</p>
</td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.IndexSearcher</span></td>
<td><span class="parametername">s</span></td>
<td><p>An <span class="xref">Lucene.Net.Search.IndexSearcher</span>.</p>
</td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Search_QueryUtils_Check_System_Random_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher__seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Search.QueryUtils.html#Lucene_Net_Search_QueryUtils_Check_Lucene_Net_Search_Query_">Check(Query)</a></div>
<div><a class="xref" href="Lucene.Net.Search.QueryUtils.html#Lucene_Net_Search_QueryUtils_CheckFirstSkipTo_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_">CheckFirstSkipTo(Query, IndexSearcher)</a></div>
<div><a class="xref" href="Lucene.Net.Search.QueryUtils.html#Lucene_Net_Search_QueryUtils_CheckSkipTo_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_">CheckSkipTo(Query, IndexSearcher)</a></div>
<div><a class="xref" href="Lucene.Net.Search.QueryUtils.html#Lucene_Net_Search_QueryUtils_CheckExplanations_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_">CheckExplanations(Query, IndexSearcher)</a></div>
<div><a class="xref" href="Lucene.Net.Search.QueryUtils.html#Lucene_Net_Search_QueryUtils_CheckEqual_Lucene_Net_Search_Query_Lucene_Net_Search_Query_">CheckEqual(Query, Query)</a></div>
</div>
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</span>
<a id="Lucene_Net_Search_QueryUtils_Check_" data-uid="Lucene.Net.Search.QueryUtils.Check*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_Check_System_Random_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_System_Boolean_" data-uid="Lucene.Net.Search.QueryUtils.Check(System.Random,Lucene.Net.Search.Query,Lucene.Net.Search.IndexSearcher,System.Boolean)">Check(Random, Query, IndexSearcher, Boolean)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void Check(Random random, Query q1, IndexSearcher s, bool wrap)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Random</span></td>
<td><span class="parametername">random</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q1</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.IndexSearcher</span></td>
<td><span class="parametername">s</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">wrap</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_QueryUtils_CheckEqual_" data-uid="Lucene.Net.Search.QueryUtils.CheckEqual*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_CheckEqual_Lucene_Net_Search_Query_Lucene_Net_Search_Query_" data-uid="Lucene.Net.Search.QueryUtils.CheckEqual(Lucene.Net.Search.Query,Lucene.Net.Search.Query)">CheckEqual(Query, Query)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void CheckEqual(Query q1, Query q2)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q1</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q2</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Search_QueryUtils_CheckExplanations_" data-uid="Lucene.Net.Search.QueryUtils.CheckExplanations*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_CheckExplanations_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Search.QueryUtils.CheckExplanations(Lucene.Net.Search.Query,Lucene.Net.Search.IndexSearcher)">CheckExplanations(Query, IndexSearcher)</h4>
<div class="markdown level1 summary"><p>Deep check that explanations of a query &apos;score&apos; correctly. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void CheckExplanations(Query q, IndexSearcher s)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.IndexSearcher</span></td>
<td><span class="parametername">s</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_QueryUtils_CheckFirstSkipTo_" data-uid="Lucene.Net.Search.QueryUtils.CheckFirstSkipTo*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_CheckFirstSkipTo_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Search.QueryUtils.CheckFirstSkipTo(Lucene.Net.Search.Query,Lucene.Net.Search.IndexSearcher)">CheckFirstSkipTo(Query, IndexSearcher)</h4>
<div class="markdown level1 summary"><p>Check that first skip on just created scorers always goes to the right doc.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void CheckFirstSkipTo(Query q, IndexSearcher s)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.IndexSearcher</span></td>
<td><span class="parametername">s</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_QueryUtils_CheckHashEquals_" data-uid="Lucene.Net.Search.QueryUtils.CheckHashEquals*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_CheckHashEquals_Lucene_Net_Search_Query_" data-uid="Lucene.Net.Search.QueryUtils.CheckHashEquals(Lucene.Net.Search.Query)">CheckHashEquals(Query)</h4>
<div class="markdown level1 summary"><p>Check very basic <span class="xref">System.Object.GetHashCode()</span> and <span class="xref">System.Object.Equals(System.Object)</span>. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void CheckHashEquals(Query q)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Search_QueryUtils_CheckSkipTo_" data-uid="Lucene.Net.Search.QueryUtils.CheckSkipTo*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_CheckSkipTo_Lucene_Net_Search_Query_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Search.QueryUtils.CheckSkipTo(Lucene.Net.Search.Query,Lucene.Net.Search.IndexSearcher)">CheckSkipTo(Query, IndexSearcher)</h4>
<div class="markdown level1 summary"><p>Alternate scorer skipTo(),skipTo(),next(),next(),skipTo(),skipTo(), etc
and ensure a hitcollector receives same docs and scores.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void CheckSkipTo(Query q, IndexSearcher s)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.IndexSearcher</span></td>
<td><span class="parametername">s</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_QueryUtils_CheckUnequal_Lucene_Net_Search_Query_Lucene_Net_Search_Query_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.QueryUtils.CheckUnequal(Lucene.Net.Search.Query%2CLucene.Net.Search.Query)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<a id="Lucene_Net_Search_QueryUtils_CheckUnequal_" data-uid="Lucene.Net.Search.QueryUtils.CheckUnequal*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_CheckUnequal_Lucene_Net_Search_Query_Lucene_Net_Search_Query_" data-uid="Lucene.Net.Search.QueryUtils.CheckUnequal(Lucene.Net.Search.Query,Lucene.Net.Search.Query)">CheckUnequal(Query, Query)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void CheckUnequal(Query q1, Query q2)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q1</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><span class="parametername">q2</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_QueryUtils_PurgeFieldCache_Lucene_Net_Index_IndexReader_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.QueryUtils.PurgeFieldCache(Lucene.Net.Index.IndexReader)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Search_QueryUtils_PurgeFieldCache_" data-uid="Lucene.Net.Search.QueryUtils.PurgeFieldCache*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_PurgeFieldCache_Lucene_Net_Index_IndexReader_" data-uid="Lucene.Net.Search.QueryUtils.PurgeFieldCache(Lucene.Net.Index.IndexReader)">PurgeFieldCache(IndexReader)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void PurgeFieldCache(IndexReader r)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Index.IndexReader</span></td>
<td><span class="parametername">r</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_QueryUtils_WrapUnderlyingReader_System_Random_Lucene_Net_Search_IndexSearcher_System_Int32_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.QueryUtils.WrapUnderlyingReader(System.Random%2CLucene.Net.Search.IndexSearcher%2CSystem.Int32)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<a id="Lucene_Net_Search_QueryUtils_WrapUnderlyingReader_" data-uid="Lucene.Net.Search.QueryUtils.WrapUnderlyingReader*"></a>
<h4 id="Lucene_Net_Search_QueryUtils_WrapUnderlyingReader_System_Random_Lucene_Net_Search_IndexSearcher_System_Int32_" data-uid="Lucene.Net.Search.QueryUtils.WrapUnderlyingReader(System.Random,Lucene.Net.Search.IndexSearcher,System.Int32)">WrapUnderlyingReader(Random, IndexSearcher, Int32)</h4>
<div class="markdown level1 summary"><p>Given an <span class="xref">Lucene.Net.Search.IndexSearcher</span>, returns a new <span class="xref">Lucene.Net.Search.IndexSearcher</span> whose <span class="xref">Lucene.Net.Index.IndexReader</span>
is a <span class="xref">Lucene.Net.Index.MultiReader</span> containing the <span class="xref">Lucene.Net.Index.IndexReader</span> of the original <span class="xref">Lucene.Net.Search.IndexSearcher</span>,
as well as several &quot;empty&quot; <span class="xref">Lucene.Net.Index.IndexReader</span>s -- some of which will have
deleted documents in them. This new <span class="xref">Lucene.Net.Search.IndexSearcher</span> should
behave exactly the same as the original <span class="xref">Lucene.Net.Search.IndexSearcher</span>. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IndexSearcher WrapUnderlyingReader(Random random, IndexSearcher s, int edge)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Random</span></td>
<td><span class="parametername">random</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.IndexSearcher</span></td>
<td><span class="parametername">s</span></td>
<td><p>The searcher to wrap. </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">edge</span></td>
<td><p>If negative, s will be the first sub; if 0, s will be in the middle, if positive s will be the last sub. </p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.IndexSearcher</span></td>
<td></td>
</tr>
</tbody>
</table>
</article>
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