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<article class="content wrap" id="_content" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone">
<h1 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone" class="text-break">Class DoubleMetaphone
</h1>
<div class="markdown level0 summary"><p>Encodes a string into a double metaphone value. This Implementation is based on the algorithm by <code>Lawrence
Philips</code>.
<p>
This class is conditionally thread-safe. The instance field <span class="xref">Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.maxCodeLen</span> is mutable
<a class="xref" href="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.html#Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_MaxCodeLen">MaxCodeLen</a> but is not volatile, and accesses are not synchronized. If an instance of the class is
shared between threads, the caller needs to ensure that suitable synchronization is used to ensure safe publication
of the value between threads, and must not set <a class="xref" href="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.html#Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_MaxCodeLen">MaxCodeLen</a> after initial setup.
<p>
See <a href="http://drdobbs.com/184401251?pgno=2">Original Article</a>
<p>
See <a href="http://en.wikipedia.org/wiki/Metaphone">http://en.wikipedia.org/wiki/Metaphone</a></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">DoubleMetaphone</span></div>
</div>
<div classs="implements">
<h5>Implements</h5>
<div><a class="xref" href="Lucene.Net.Analysis.Phonetic.Language.IStringEncoder.html">IStringEncoder</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.Analysis.Phonetic.Language.html">Lucene.Net.Analysis.Phonetic.Language</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Analysis.Phonetic.dll</h6>
<h5 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class DoubleMetaphone : IStringEncoder</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
<span class="small pull-right mobile-hide">
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<a id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone__ctor_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone__ctor" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.#ctor">DoubleMetaphone()</h4>
<div class="markdown level1 summary"><p>Creates an instance of this <a class="xref" href="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.html">DoubleMetaphone</a> encoder</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public DoubleMetaphone()</code></pre>
</div>
<h3 id="properties">Properties
</h3>
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<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_MaxCodeLen" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.MaxCodeLen">MaxCodeLen</h4>
<div class="markdown level1 summary"><p>Gets or Sets the maxCodeLen.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual int MaxCodeLen { get; set; }</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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_CharAt_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.CharAt*"></a>
<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_CharAt_System_String_System_Int32_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.CharAt(System.String,System.Int32)">CharAt(String, Int32)</h4>
<div class="markdown level1 summary"><p>Gets the character at index <code data-dev-comment-type="paramref" class="paramref">index</code> if available, otherwise
it returns <span class="xref">System.Char.MinValue</span> so that there is some sort
of a default.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected virtual char CharAt(string value, int index)</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">value</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">index</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.Char</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_Contains_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.Contains*"></a>
<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_Contains_System_String_System_Int32_System_Int32_System_String___" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.Contains(System.String,System.Int32,System.Int32,System.String[])">Contains(String, Int32, Int32, String[])</h4>
<div class="markdown level1 summary"><p>Determines whether <code data-dev-comment-type="paramref" class="paramref">value</code> contains any of the criteria starting at index <code data-dev-comment-type="paramref" class="paramref">start</code> and
matching up to length <code data-dev-comment-type="paramref" class="paramref">length</code>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected static bool Contains(string value, int start, int length, params string[] criteria)</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">value</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">start</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">length</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.String</span>[]</td>
<td><span class="parametername">criteria</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 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_Encode_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.Encode*"></a>
<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_Encode_System_String_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.Encode(System.String)">Encode(String)</h4>
<div class="markdown level1 summary"><p>Encode the value using DoubleMetaphone.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual string Encode(string value)</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">value</span></td>
<td><p>String to encode.</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.String</span></td>
<td><p>An encoded string.</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_GetDoubleMetaphone_System_String_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.GetDoubleMetaphone(System.String)">GetDoubleMetaphone(String)</h4>
<div class="markdown level1 summary"><p>Encode a value with Double Metaphone.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual string GetDoubleMetaphone(string value)</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">value</span></td>
<td><p>String to encode.</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.String</span></td>
<td><p>An encoded string.</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_GetDoubleMetaphone_System_String_System_Boolean_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.GetDoubleMetaphone(System.String,System.Boolean)">GetDoubleMetaphone(String, Boolean)</h4>
<div class="markdown level1 summary"><p>Encode a value with Double Metaphone, optionally using the alternate encoding.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual string GetDoubleMetaphone(string value, bool alternate)</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">value</span></td>
<td><p>String to encode.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">alternate</span></td>
<td><p>Use alternate encode.</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.String</span></td>
<td><p>An encoded string.</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_IsDoubleMetaphoneEqual_System_String_System_String_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.IsDoubleMetaphoneEqual(System.String,System.String)">IsDoubleMetaphoneEqual(String, String)</h4>
<div class="markdown level1 summary"><p>Check if the Double Metaphone values of two <span class="xref">System.String</span> values
are equal.</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 IsDoubleMetaphoneEqual(string value1, string value2)</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">value1</span></td>
<td><p>The left-hand side of the encoded <span class="xref">System.String.Equals(System.Object)</span>.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">value2</span></td>
<td><p>The right-hand side of the encoded <span class="xref">System.String.Equals(System.Object)</span>.</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><code>true</code> if the encoded <span class="xref">System.String</span>s are equal; <code>false</code> otherwise.</p>
</td>
</tr>
</tbody>
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<h4 id="Lucene_Net_Analysis_Phonetic_Language_DoubleMetaphone_IsDoubleMetaphoneEqual_System_String_System_String_System_Boolean_" data-uid="Lucene.Net.Analysis.Phonetic.Language.DoubleMetaphone.IsDoubleMetaphoneEqual(System.String,System.String,System.Boolean)">IsDoubleMetaphoneEqual(String, String, Boolean)</h4>
<div class="markdown level1 summary"><p>Check if the Double Metaphone values of two <span class="xref">System.String</span> values
are equal, optionally using the alternate value.</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 IsDoubleMetaphoneEqual(string value1, string value2, bool alternate)</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">value1</span></td>
<td><p>The left-hand side of the encoded <span class="xref">System.String.Equals(System.Object)</span>.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">value2</span></td>
<td><p>The right-hand side of the encoded <span class="xref">System.String.Equals(System.Object)</span>.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">alternate</span></td>
<td><p>Use the alternate value if <code>true</code>.</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><code>true</code> if the encoded <span class="xref">System.String</span>s are equal; <code>false</code> otherwise.</p>
</td>
</tr>
</tbody>
</table>
<h3 id="implements">Implements</h3>
<div>
<a class="xref" href="Lucene.Net.Analysis.Phonetic.Language.IStringEncoder.html">IStringEncoder</a>
</div>
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