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| Apache Lucene.NET 4.8.0-beta00010 Documentation </title>
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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.CachingWrapperFilter">
<h1 id="Lucene_Net_Search_CachingWrapperFilter" data-uid="Lucene.Net.Search.CachingWrapperFilter" class="text-break">Class CachingWrapperFilter
</h1>
<div class="markdown level0 summary"><p>Wraps another <a class="xref" href="Lucene.Net.Search.Filter.html">Filter</a>&apos;s result and caches it. The purpose is to allow
filters to simply filter, and then wrap with this class
to add caching.</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"><a class="xref" href="Lucene.Net.Search.Filter.html">Filter</a></div>
<div class="level2"><span class="xref">CachingWrapperFilter</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="Lucene.Net.Search.Filter.html#Lucene_Net_Search_Filter_NewAnonymous_System_Func_Lucene_Net_Index_AtomicReaderContext_Lucene_Net_Util_IBits_Lucene_Net_Search_DocIdSet__">Filter.NewAnonymous(Func&lt;AtomicReaderContext, IBits, DocIdSet&gt;)</a>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</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>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Search.html">Lucene.Net.Search</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Search_CachingWrapperFilter_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class CachingWrapperFilter : Filter</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_CachingWrapperFilter__ctor_Lucene_Net_Search_Filter_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.%23ctor(Lucene.Net.Search.Filter)%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_CachingWrapperFilter__ctor_" data-uid="Lucene.Net.Search.CachingWrapperFilter.#ctor*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter__ctor_Lucene_Net_Search_Filter_" data-uid="Lucene.Net.Search.CachingWrapperFilter.#ctor(Lucene.Net.Search.Filter)">CachingWrapperFilter(Filter)</h4>
<div class="markdown level1 summary"><p>Wraps another filter&apos;s result and caches it. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public CachingWrapperFilter(Filter filter)</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><a class="xref" href="Lucene.Net.Search.Filter.html">Filter</a></td>
<td><span class="parametername">filter</span></td>
<td><p>Filter to cache results of </p>
</td>
</tr>
</tbody>
</table>
<h3 id="fields">Fields
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_CachingWrapperFilter_EMPTY_DOCIDSET.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.EMPTY_DOCIDSET%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 href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/CachingWrapperFilter.cs/#L156">View Source</a>
</span>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_EMPTY_DOCIDSET" data-uid="Lucene.Net.Search.CachingWrapperFilter.EMPTY_DOCIDSET">EMPTY_DOCIDSET</h4>
<div class="markdown level1 summary"><p>An empty <a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a> instance </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected static readonly DocIdSet EMPTY_DOCIDSET</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_CachingWrapperFilter_Filter.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.Filter%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_CachingWrapperFilter_Filter_" data-uid="Lucene.Net.Search.CachingWrapperFilter.Filter*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_Filter" data-uid="Lucene.Net.Search.CachingWrapperFilter.Filter">Filter</h4>
<div class="markdown level1 summary"><p>Gets the contained filter. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual Filter Filter { get; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="Lucene.Net.Search.Filter.html">Filter</a></td>
<td><p>the contained filter. </p>
</td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_CachingWrapperFilter_CacheImpl_Lucene_Net_Search_DocIdSetIterator_Lucene_Net_Index_AtomicReader_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.CacheImpl(Lucene.Net.Search.DocIdSetIterator%2CLucene.Net.Index.AtomicReader)%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 href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/CachingWrapperFilter.cs/#L100">View Source</a>
</span>
<a id="Lucene_Net_Search_CachingWrapperFilter_CacheImpl_" data-uid="Lucene.Net.Search.CachingWrapperFilter.CacheImpl*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_CacheImpl_Lucene_Net_Search_DocIdSetIterator_Lucene_Net_Index_AtomicReader_" data-uid="Lucene.Net.Search.CachingWrapperFilter.CacheImpl(Lucene.Net.Search.DocIdSetIterator,Lucene.Net.Index.AtomicReader)">CacheImpl(DocIdSetIterator, AtomicReader)</h4>
<div class="markdown level1 summary"><p>Default cache implementation: uses <a class="xref" href="Lucene.Net.Util.WAH8DocIdSet.html">WAH8DocIdSet</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected virtual DocIdSet CacheImpl(DocIdSetIterator iterator, AtomicReader reader)</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><a class="xref" href="Lucene.Net.Search.DocIdSetIterator.html">DocIdSetIterator</a></td>
<td><span class="parametername">iterator</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Index.AtomicReader.html">AtomicReader</a></td>
<td><span class="parametername">reader</span></td>
<td></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><a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a></td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_CachingWrapperFilter_DocIdSetToCache_Lucene_Net_Search_DocIdSet_Lucene_Net_Index_AtomicReader_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.DocIdSetToCache(Lucene.Net.Search.DocIdSet%2CLucene.Net.Index.AtomicReader)%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_CachingWrapperFilter_DocIdSetToCache_" data-uid="Lucene.Net.Search.CachingWrapperFilter.DocIdSetToCache*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_DocIdSetToCache_Lucene_Net_Search_DocIdSet_Lucene_Net_Index_AtomicReader_" data-uid="Lucene.Net.Search.CachingWrapperFilter.DocIdSetToCache(Lucene.Net.Search.DocIdSet,Lucene.Net.Index.AtomicReader)">DocIdSetToCache(DocIdSet, AtomicReader)</h4>
<div class="markdown level1 summary"><p>Provide the <a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a> to be cached, using the <a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a> provided
by the wrapped Filter.
<p>This implementation returns the given <a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a>,
if <a class="xref" href="Lucene.Net.Search.DocIdSet.html#Lucene_Net_Search_DocIdSet_IsCacheable">IsCacheable</a> returns <code>true</code>, else it calls
<a class="xref" href="Lucene.Net.Search.CachingWrapperFilter.html#Lucene_Net_Search_CachingWrapperFilter_CacheImpl_Lucene_Net_Search_DocIdSetIterator_Lucene_Net_Index_AtomicReader_">CacheImpl(DocIdSetIterator, AtomicReader)</a>
<p>Note: this method returns <a class="xref" href="Lucene.Net.Search.CachingWrapperFilter.html#Lucene_Net_Search_CachingWrapperFilter_EMPTY_DOCIDSET">EMPTY_DOCIDSET</a> if the given <code data-dev-comment-type="paramref" class="paramref">docIdSet</code>
is <code>null</code> or if <a class="xref" href="Lucene.Net.Search.DocIdSet.html#Lucene_Net_Search_DocIdSet_GetIterator">GetIterator()</a> return <code>null</code>. The empty
instance is use as a placeholder in the cache instead of the <code>null</code> value.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected virtual DocIdSet DocIdSetToCache(DocIdSet docIdSet, AtomicReader reader)</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><a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a></td>
<td><span class="parametername">docIdSet</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Index.AtomicReader.html">AtomicReader</a></td>
<td><span class="parametername">reader</span></td>
<td></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><a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a></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_CachingWrapperFilter_Equals_System_Object_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.Equals(System.Object)%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_CachingWrapperFilter_Equals_" data-uid="Lucene.Net.Search.CachingWrapperFilter.Equals*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_Equals_System_Object_" data-uid="Lucene.Net.Search.CachingWrapperFilter.Equals(System.Object)">Equals(Object)</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 override bool Equals(object o)</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.Object</span></td>
<td><span class="parametername">o</span></td>
<td></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">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">System.Object.Equals(System.Object)</span></div>
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<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_CachingWrapperFilter_GetDocIdSet_Lucene_Net_Index_AtomicReaderContext_Lucene_Net_Util_IBits_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.GetDocIdSet(Lucene.Net.Index.AtomicReaderContext%2CLucene.Net.Util.IBits)%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_CachingWrapperFilter_GetDocIdSet_" data-uid="Lucene.Net.Search.CachingWrapperFilter.GetDocIdSet*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_GetDocIdSet_Lucene_Net_Index_AtomicReaderContext_Lucene_Net_Util_IBits_" data-uid="Lucene.Net.Search.CachingWrapperFilter.GetDocIdSet(Lucene.Net.Index.AtomicReaderContext,Lucene.Net.Util.IBits)">GetDocIdSet(AtomicReaderContext, IBits)</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 override DocIdSet GetDocIdSet(AtomicReaderContext context, IBits acceptDocs)</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><a class="xref" href="Lucene.Net.Index.AtomicReaderContext.html">AtomicReaderContext</a></td>
<td><span class="parametername">context</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Util.IBits.html">IBits</a></td>
<td><span class="parametername">acceptDocs</span></td>
<td></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><a class="xref" href="Lucene.Net.Search.DocIdSet.html">DocIdSet</a></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Filter.html#Lucene_Net_Search_Filter_GetDocIdSet_Lucene_Net_Index_AtomicReaderContext_Lucene_Net_Util_IBits_">Filter.GetDocIdSet(AtomicReaderContext, IBits)</a></div>
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<a id="Lucene_Net_Search_CachingWrapperFilter_GetHashCode_" data-uid="Lucene.Net.Search.CachingWrapperFilter.GetHashCode*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_GetHashCode" data-uid="Lucene.Net.Search.CachingWrapperFilter.GetHashCode">GetHashCode()</h4>
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<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override int GetHashCode()</code></pre>
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<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
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<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
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<h5 class="overrides">Overrides</h5>
<div><span class="xref">System.Object.GetHashCode()</span></div>
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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_CachingWrapperFilter_GetSizeInBytes.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.GetSizeInBytes%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_CachingWrapperFilter_GetSizeInBytes_" data-uid="Lucene.Net.Search.CachingWrapperFilter.GetSizeInBytes*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_GetSizeInBytes" data-uid="Lucene.Net.Search.CachingWrapperFilter.GetSizeInBytes">GetSizeInBytes()</h4>
<div class="markdown level1 summary"><p>Returns total byte size used by cached filters. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual long GetSizeInBytes()</code></pre>
</div>
<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">System.Int64</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_CachingWrapperFilter_ToString.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.CachingWrapperFilter.ToString%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_CachingWrapperFilter_ToString_" data-uid="Lucene.Net.Search.CachingWrapperFilter.ToString*"></a>
<h4 id="Lucene_Net_Search_CachingWrapperFilter_ToString" data-uid="Lucene.Net.Search.CachingWrapperFilter.ToString">ToString()</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 override string ToString()</code></pre>
</div>
<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">System.String</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">System.Object.ToString()</span></div>
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