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<article class="content wrap" id="_content" data-uid="Lucene.Net.Codecs.DocValuesFormat">
<h1 id="Lucene_Net_Codecs_DocValuesFormat" data-uid="Lucene.Net.Codecs.DocValuesFormat" class="text-break">Class DocValuesFormat
</h1>
<div class="markdown level0 summary"><p>Encodes/decodes per-document values.
<p>
Note, when extending this class, the name (<a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_Name">Name</a>) may
written into the index in certain configurations. In order for the segment
to be read, the name must resolve to your implementation via <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_ForName_System_String_">ForName(String)</a>.
This method uses <a class="xref" href="Lucene.Net.Codecs.IDocValuesFormatFactory.html#Lucene_Net_Codecs_IDocValuesFormatFactory_GetDocValuesFormat_System_String_">GetDocValuesFormat(String)</a> to resolve format names.
<p>
To implement your own format:
<ol><li>Subclass this class.</li><li>Subclass <a class="xref" href="Lucene.Net.Codecs.DefaultDocValuesFormatFactory.html">DefaultDocValuesFormatFactory</a>, override the <a class="xref" href="Lucene.Net.Codecs.DefaultDocValuesFormatFactory.html#Lucene_Net_Codecs_DefaultDocValuesFormatFactory_Initialize">Initialize()</a> method,
and add the line <code>base.ScanForDocValuesFormats(typeof(YourDocValuesFormat).Assembly)</code>.
If you have any format classes in your assembly
that are not meant for reading, you can add the <a class="xref" href="Lucene.Net.Codecs.ExcludeDocValuesFormatFromScanAttribute.html">ExcludeDocValuesFormatFromScanAttribute</a>
to them so they are ignored by the scan.</li><li>Set the new <a class="xref" href="Lucene.Net.Codecs.IDocValuesFormatFactory.html">IDocValuesFormatFactory</a> by calling <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_SetDocValuesFormatFactory_Lucene_Net_Codecs_IDocValuesFormatFactory_">SetDocValuesFormatFactory(IDocValuesFormatFactory)</a>
at application startup.</li></ol>
If your format has dependencies, you may also override <a class="xref" href="Lucene.Net.Codecs.DefaultDocValuesFormatFactory.html#Lucene_Net_Codecs_DefaultDocValuesFormatFactory_GetDocValuesFormat_System_Type_">GetDocValuesFormat(Type)</a>
to inject them via pure DI or a DI container. See <a href="http://blog.ploeh.dk/2014/05/19/di-friendly-framework/">DI-Friendly Framework</a>
to understand the approach used.
<p>
<strong>DocValuesFormat Names</strong>
<p>
Unlike the Java version, format names are by default convention-based on the class name.
If you name your custom format class &quot;MyCustomDocValuesFormat&quot;, the format name will the same name
without the &quot;DocValuesFormat&quot; suffix: &quot;MyCustom&quot;.
<p>
You can override this default behavior by using the <a class="xref" href="Lucene.Net.Codecs.DocValuesFormatNameAttribute.html">DocValuesFormatNameAttribute</a> to
name the format differently than this convention. Format names must be all ASCII alphanumeric,
and less than 128 characters in length.
<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">DocValuesFormat</span></div>
<div class="level2"><a class="xref" href="Lucene.Net.Codecs.Lucene40.Lucene40DocValuesFormat.html">Lucene40DocValuesFormat</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Codecs.Lucene42.Lucene42DocValuesFormat.html">Lucene42DocValuesFormat</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.html">Lucene45DocValuesFormat</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Codecs.PerField.PerFieldDocValuesFormat.html">PerFieldDocValuesFormat</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>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Codecs.html">Lucene.Net.Codecs</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Codecs_DocValuesFormat_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class DocValuesFormat</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
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<a id="Lucene_Net_Codecs_DocValuesFormat__ctor_" data-uid="Lucene.Net.Codecs.DocValuesFormat.#ctor*"></a>
<h4 id="Lucene_Net_Codecs_DocValuesFormat__ctor" data-uid="Lucene.Net.Codecs.DocValuesFormat.#ctor">DocValuesFormat()</h4>
<div class="markdown level1 summary"><p>Creates a new docvalues format.
<p>
The provided name will be written into the index segment in some configurations
(such as when using <a class="xref" href="Lucene.Net.Codecs.PerField.PerFieldDocValuesFormat.html">PerFieldDocValuesFormat</a>): in such configurations,
for the segment to be read this class should be registered by subclassing <a class="xref" href="Lucene.Net.Codecs.DefaultDocValuesFormatFactory.html">DefaultDocValuesFormatFactory</a> and
calling <a class="xref" href="Lucene.Net.Codecs.DefaultDocValuesFormatFactory.html#Lucene_Net_Codecs_DefaultDocValuesFormatFactory_ScanForDocValuesFormats_System_Reflection_Assembly_">ScanForDocValuesFormats(Assembly)</a> in the class constructor.
The new <a class="xref" href="Lucene.Net.Codecs.IDocValuesFormatFactory.html">IDocValuesFormatFactory</a> can be registered by calling <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_SetDocValuesFormatFactory_Lucene_Net_Codecs_IDocValuesFormatFactory_">SetDocValuesFormatFactory(IDocValuesFormatFactory)</a>
at application startup.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected DocValuesFormat()</code></pre>
</div>
<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_Codecs_DocValuesFormat_AvailableDocValuesFormats.md&amp;value=---%0Auid%3A%20Lucene.Net.Codecs.DocValuesFormat.AvailableDocValuesFormats%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_Codecs_DocValuesFormat_AvailableDocValuesFormats_" data-uid="Lucene.Net.Codecs.DocValuesFormat.AvailableDocValuesFormats*"></a>
<h4 id="Lucene_Net_Codecs_DocValuesFormat_AvailableDocValuesFormats" data-uid="Lucene.Net.Codecs.DocValuesFormat.AvailableDocValuesFormats">AvailableDocValuesFormats</h4>
<div class="markdown level1 summary"><p>Returns a list of all available format names. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static ICollection&lt;string&gt; AvailableDocValuesFormats { 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.Collections.Generic.ICollection</span>&lt;<span class="xref">System.String</span>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Codecs_DocValuesFormat_Name_" data-uid="Lucene.Net.Codecs.DocValuesFormat.Name*"></a>
<h4 id="Lucene_Net_Codecs_DocValuesFormat_Name" data-uid="Lucene.Net.Codecs.DocValuesFormat.Name">Name</h4>
<div class="markdown level1 summary"><p>Unique name that&apos;s used to retrieve this format when
reading the index.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public string Name { 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.String</span></td>
<td></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_Codecs_DocValuesFormat_FieldsConsumer_Lucene_Net_Index_SegmentWriteState_.md&amp;value=---%0Auid%3A%20Lucene.Net.Codecs.DocValuesFormat.FieldsConsumer(Lucene.Net.Index.SegmentWriteState)%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_Codecs_DocValuesFormat_FieldsConsumer_" data-uid="Lucene.Net.Codecs.DocValuesFormat.FieldsConsumer*"></a>
<h4 id="Lucene_Net_Codecs_DocValuesFormat_FieldsConsumer_Lucene_Net_Index_SegmentWriteState_" data-uid="Lucene.Net.Codecs.DocValuesFormat.FieldsConsumer(Lucene.Net.Index.SegmentWriteState)">FieldsConsumer(SegmentWriteState)</h4>
<div class="markdown level1 summary"><p>Returns a <a class="xref" href="Lucene.Net.Codecs.DocValuesConsumer.html">DocValuesConsumer</a> to write docvalues to the
index.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract DocValuesConsumer FieldsConsumer(SegmentWriteState state)</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.SegmentWriteState.html">SegmentWriteState</a></td>
<td><span class="parametername">state</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.Codecs.DocValuesConsumer.html">DocValuesConsumer</a></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Codecs_DocValuesFormat_FieldsProducer_" data-uid="Lucene.Net.Codecs.DocValuesFormat.FieldsProducer*"></a>
<h4 id="Lucene_Net_Codecs_DocValuesFormat_FieldsProducer_Lucene_Net_Index_SegmentReadState_" data-uid="Lucene.Net.Codecs.DocValuesFormat.FieldsProducer(Lucene.Net.Index.SegmentReadState)">FieldsProducer(SegmentReadState)</h4>
<div class="markdown level1 summary"><p>Returns a <a class="xref" href="Lucene.Net.Codecs.DocValuesProducer.html">DocValuesProducer</a> to read docvalues from the index.
<p>
NOTE: by the time this call returns, it must hold open any files it will
need to use; else, those files may be deleted. Additionally, required files
may be deleted during the execution of this call before there is a chance
to open them. Under these circumstances an <span class="xref">System.IO.IOException</span> should be thrown by
the implementation. <span class="xref">System.IO.IOException</span>s are expected and will automatically cause
a retry of the segment opening logic with the newly revised segments.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract DocValuesProducer FieldsProducer(SegmentReadState state)</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.SegmentReadState.html">SegmentReadState</a></td>
<td><span class="parametername">state</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.Codecs.DocValuesProducer.html">DocValuesProducer</a></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Codecs_DocValuesFormat_ForName_" data-uid="Lucene.Net.Codecs.DocValuesFormat.ForName*"></a>
<h4 id="Lucene_Net_Codecs_DocValuesFormat_ForName_System_String_" data-uid="Lucene.Net.Codecs.DocValuesFormat.ForName(System.String)">ForName(String)</h4>
<div class="markdown level1 summary"><p>Looks up a format by name. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static DocValuesFormat ForName(string name)</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">name</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.Codecs.DocValuesFormat.html">DocValuesFormat</a></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Codecs_DocValuesFormat_GetDocValuesFormatFactory" data-uid="Lucene.Net.Codecs.DocValuesFormat.GetDocValuesFormatFactory">GetDocValuesFormatFactory()</h4>
<div class="markdown level1 summary"><p>Gets the associated <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html">DocValuesFormat</a> factory.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IDocValuesFormatFactory GetDocValuesFormatFactory()</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><a class="xref" href="Lucene.Net.Codecs.IDocValuesFormatFactory.html">IDocValuesFormatFactory</a></td>
<td><p>The <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html">DocValuesFormat</a> factory.</p>
</td>
</tr>
</tbody>
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<a id="Lucene_Net_Codecs_DocValuesFormat_SetDocValuesFormatFactory_" data-uid="Lucene.Net.Codecs.DocValuesFormat.SetDocValuesFormatFactory*"></a>
<h4 id="Lucene_Net_Codecs_DocValuesFormat_SetDocValuesFormatFactory_Lucene_Net_Codecs_IDocValuesFormatFactory_" data-uid="Lucene.Net.Codecs.DocValuesFormat.SetDocValuesFormatFactory(Lucene.Net.Codecs.IDocValuesFormatFactory)">SetDocValuesFormatFactory(IDocValuesFormatFactory)</h4>
<div class="markdown level1 summary"><p>Sets the <a class="xref" href="Lucene.Net.Codecs.IDocValuesFormatFactory.html">IDocValuesFormatFactory</a> instance used to instantiate
<a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html">DocValuesFormat</a> subclasses.</p>
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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 static void SetDocValuesFormatFactory(IDocValuesFormatFactory docValuesFormatFactory)</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.Codecs.IDocValuesFormatFactory.html">IDocValuesFormatFactory</a></td>
<td><span class="parametername">docValuesFormatFactory</span></td>
<td><p>The new <a class="xref" href="Lucene.Net.Codecs.IDocValuesFormatFactory.html">IDocValuesFormatFactory</a>.</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.ArgumentNullException</span></td>
<td><p>The <code data-dev-comment-type="paramref" class="paramref">docValuesFormatFactory</code> parameter is <code>null</code>.</p>
</td>
</tr>
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<a id="Lucene_Net_Codecs_DocValuesFormat_ToString_" data-uid="Lucene.Net.Codecs.DocValuesFormat.ToString*"></a>
<h4 id="Lucene_Net_Codecs_DocValuesFormat_ToString" data-uid="Lucene.Net.Codecs.DocValuesFormat.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>
<h3 id="seealso">See Also</h3>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Codecs.DefaultDocValuesFormatFactory.html">DefaultDocValuesFormatFactory</a></div>
<div><a class="xref" href="Lucene.Net.Codecs.IDocValuesFormatFactory.html">IDocValuesFormatFactory</a></div>
<div><a class="xref" href="Lucene.Net.Codecs.DocValuesFormatNameAttribute.html">DocValuesFormatNameAttribute</a></div>
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