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<h1 id="Lucene_Net_Search_Suggest_Lookup" data-uid="Lucene.Net.Search.Suggest.Lookup" class="text-break">Class Lookup
</h1>
<div class="markdown level0 summary"><p>Simple Lookup interface for <span class="xref">System.String</span> suggestions.</p>
<div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></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">Lookup</span></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Suggest.Analyzing.AnalyzingInfixSuggester.html">AnalyzingInfixSuggester</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Suggest.Analyzing.AnalyzingSuggester.html">AnalyzingSuggester</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Suggest.Analyzing.FreeTextSuggester.html">FreeTextSuggester</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.html">FSTCompletionLookup</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Suggest.Fst.WFSTCompletionLookup.html">WFSTCompletionLookup</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Suggest.Jaspell.JaspellLookup.html">JaspellLookup</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Suggest.Tst.TSTLookup.html">TSTLookup</a></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.Suggest.html">Lucene.Net.Search.Suggest</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Suggest.dll</h6>
<h5 id="Lucene_Net_Search_Suggest_Lookup_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class Lookup</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Search_Suggest_Lookup__ctor_" data-uid="Lucene.Net.Search.Suggest.Lookup.#ctor*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup__ctor" data-uid="Lucene.Net.Search.Suggest.Lookup.#ctor">Lookup()</h4>
<div class="markdown level1 summary"><p>Sole constructor. (For invocation by subclass
constructors, typically implicit.)</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public Lookup()</code></pre>
</div>
<h3 id="fields">Fields
</h3>
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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_Suggest_Lookup_CHARSEQUENCE_COMPARER.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Suggest.Lookup.CHARSEQUENCE_COMPARER%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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<h4 id="Lucene_Net_Search_Suggest_Lookup_CHARSEQUENCE_COMPARER" data-uid="Lucene.Net.Search.Suggest.Lookup.CHARSEQUENCE_COMPARER">CHARSEQUENCE_COMPARER</h4>
<div class="markdown level1 summary"><p>A simple char-by-char comparer for <span class="xref">System.String</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 readonly IComparer&lt;string&gt; CHARSEQUENCE_COMPARER</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><span class="xref">System.Collections.Generic.IComparer</span>&lt;<span class="xref">System.String</span>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
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<a id="Lucene_Net_Search_Suggest_Lookup_Count_" data-uid="Lucene.Net.Search.Suggest.Lookup.Count*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_Count" data-uid="Lucene.Net.Search.Suggest.Lookup.Count">Count</h4>
<div class="markdown level1 summary"><p>Get the number of entries the lookup was built with </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract long Count { 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><span class="xref">System.Int64</span></td>
<td><p>total number of suggester entries </p>
</td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Search_Suggest_Lookup_Build_" data-uid="Lucene.Net.Search.Suggest.Lookup.Build*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_Build_Lucene_Net_Search_Spell_IDictionary_" data-uid="Lucene.Net.Search.Suggest.Lookup.Build(Lucene.Net.Search.Spell.IDictionary)">Build(IDictionary)</h4>
<div class="markdown level1 summary"><p>Build lookup from a dictionary. Some implementations may require sorted
or unsorted keys from the dictionary&apos;s iterator - use
<a class="xref" href="Lucene.Net.Search.Suggest.SortedInputIterator.html">SortedInputIterator</a> or
<a class="xref" href="Lucene.Net.Search.Suggest.UnsortedInputIterator.html">UnsortedInputIterator</a> in such case.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual void Build(IDictionary dict)</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.Spell.IDictionary.html">IDictionary</a></td>
<td><span class="parametername">dict</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Suggest_Lookup_Build_" data-uid="Lucene.Net.Search.Suggest.Lookup.Build*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_Build_Lucene_Net_Search_Suggest_IInputIterator_" data-uid="Lucene.Net.Search.Suggest.Lookup.Build(Lucene.Net.Search.Suggest.IInputIterator)">Build(IInputIterator)</h4>
<div class="markdown level1 summary"><p>Builds up a new internal <a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html">Lookup</a> representation based on the given <a class="xref" href="Lucene.Net.Search.Suggest.IInputIterator.html">IInputIterator</a>.
The implementation might re-sort the data internally.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract void Build(IInputIterator inputIterator)</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.Suggest.IInputIterator.html">IInputIterator</a></td>
<td><span class="parametername">inputIterator</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Suggest_Lookup_DoLookup_" data-uid="Lucene.Net.Search.Suggest.Lookup.DoLookup*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_DoLookup_System_String_System_Boolean_System_Int32_" data-uid="Lucene.Net.Search.Suggest.Lookup.DoLookup(System.String,System.Boolean,System.Int32)">DoLookup(String, Boolean, Int32)</h4>
<div class="markdown level1 summary"><p>Look up a key and return possible completion for this key. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual IList&lt;Lookup.LookupResult&gt; DoLookup(string key, bool onlyMorePopular, int num)</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.String</span></td>
<td><span class="parametername">key</span></td>
<td><p>lookup key. Depending on the implementation this may be
a prefix, misspelling, or even infix. </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">onlyMorePopular</span></td>
<td><p>return only more popular results </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">num</span></td>
<td><p>maximum number of results to return </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">System.Collections.Generic.IList</span>&lt;<a class="xref" href="Lucene.Net.Search.Suggest.Lookup.LookupResult.html">Lookup.LookupResult</a>&gt;</td>
<td><p>a list of possible completions, with their relative weight (e.g. popularity) </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Suggest_Lookup_DoLookup_" data-uid="Lucene.Net.Search.Suggest.Lookup.DoLookup*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_DoLookup_System_String_System_Collections_Generic_IEnumerable_Lucene_Net_Util_BytesRef__System_Boolean_System_Int32_" data-uid="Lucene.Net.Search.Suggest.Lookup.DoLookup(System.String,System.Collections.Generic.IEnumerable{Lucene.Net.Util.BytesRef},System.Boolean,System.Int32)">DoLookup(String, IEnumerable&lt;BytesRef&gt;, Boolean, Int32)</h4>
<div class="markdown level1 summary"><p>Look up a key and return possible completion for this key. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract IList&lt;Lookup.LookupResult&gt; DoLookup(string key, IEnumerable&lt;BytesRef&gt; contexts, bool onlyMorePopular, int num)</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.String</span></td>
<td><span class="parametername">key</span></td>
<td><p>lookup key. Depending on the implementation this may be
a prefix, misspelling, or even infix. </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Collections.Generic.IEnumerable</span>&lt;<span class="xref">Lucene.Net.Util.BytesRef</span>&gt;</td>
<td><span class="parametername">contexts</span></td>
<td><p>contexts to filter the lookup by, or null if all contexts are allowed; if the suggestion contains any of the contexts, it&apos;s a match </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">onlyMorePopular</span></td>
<td><p>return only more popular results </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">num</span></td>
<td><p>maximum number of results to return </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">System.Collections.Generic.IList</span>&lt;<a class="xref" href="Lucene.Net.Search.Suggest.Lookup.LookupResult.html">Lookup.LookupResult</a>&gt;</td>
<td><p>a list of possible completions, with their relative weight (e.g. popularity) </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Suggest_Lookup_GetSizeInBytes_" data-uid="Lucene.Net.Search.Suggest.Lookup.GetSizeInBytes*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_GetSizeInBytes" data-uid="Lucene.Net.Search.Suggest.Lookup.GetSizeInBytes">GetSizeInBytes()</h4>
<div class="markdown level1 summary"><p>Get the size of the underlying lookup implementation in memory </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract 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><p>ram size of the lookup implementation in bytes </p>
</td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Search_Suggest_Lookup_Load_" data-uid="Lucene.Net.Search.Suggest.Lookup.Load*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_Load_Lucene_Net_Store_DataInput_" data-uid="Lucene.Net.Search.Suggest.Lookup.Load(Lucene.Net.Store.DataInput)">Load(DataInput)</h4>
<div class="markdown level1 summary"><p>Discard current lookup data and load it from a previously saved copy.
Optional operation. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract bool Load(DataInput input)</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.Store.DataInput</span></td>
<td><span class="parametername">input</span></td>
<td><p>the <span class="xref">Lucene.Net.Store.DataInput</span> to load the lookup data. </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">System.Boolean</span></td>
<td><p>true if completed successfully, false if unsuccessful or not supported. </p>
</td>
</tr>
</tbody>
</table>
<h5 class="exceptions">Exceptions</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Condition</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.IOException</span></td>
<td><p>when fatal IO error occurs. </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Suggest_Lookup_Load_" data-uid="Lucene.Net.Search.Suggest.Lookup.Load*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_Load_System_IO_Stream_" data-uid="Lucene.Net.Search.Suggest.Lookup.Load(System.IO.Stream)">Load(Stream)</h4>
<div class="markdown level1 summary"><p>Calls <a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Load_Lucene_Net_Store_DataInput_">Load(DataInput)</a> after converting
<span class="xref">System.IO.Stream</span> to <span class="xref">Lucene.Net.Store.DataInput</span></p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual bool Load(Stream input)</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.IO.Stream</span></td>
<td><span class="parametername">input</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>
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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_Suggest_Lookup_Store_Lucene_Net_Store_DataOutput_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Suggest.Lookup.Store(Lucene.Net.Store.DataOutput)%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_Suggest_Lookup_Store_" data-uid="Lucene.Net.Search.Suggest.Lookup.Store*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_Store_Lucene_Net_Store_DataOutput_" data-uid="Lucene.Net.Search.Suggest.Lookup.Store(Lucene.Net.Store.DataOutput)">Store(DataOutput)</h4>
<div class="markdown level1 summary"><p>Persist the constructed lookup data to a directory. Optional operation. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract bool Store(DataOutput output)</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.Store.DataOutput</span></td>
<td><span class="parametername">output</span></td>
<td><p><span class="xref">Lucene.Net.Store.DataOutput</span> to write the data to. </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">System.Boolean</span></td>
<td><p>true if successful, false if unsuccessful or not supported. </p>
</td>
</tr>
</tbody>
</table>
<h5 class="exceptions">Exceptions</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Condition</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.IOException</span></td>
<td><p>when fatal IO error occurs. </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Suggest_Lookup_Store_" data-uid="Lucene.Net.Search.Suggest.Lookup.Store*"></a>
<h4 id="Lucene_Net_Search_Suggest_Lookup_Store_System_IO_Stream_" data-uid="Lucene.Net.Search.Suggest.Lookup.Store(System.IO.Stream)">Store(Stream)</h4>
<div class="markdown level1 summary"><p>Calls <a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Store_Lucene_Net_Store_DataOutput_">Store(DataOutput)</a> after converting
<span class="xref">System.IO.Stream</span> to <span class="xref">Lucene.Net.Store.DataOutput</span></p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual bool Store(Stream output)</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.IO.Stream</span></td>
<td><span class="parametername">output</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>
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