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<article class="content wrap" id="_content" data-uid="Lucene.Net.Index.CompositeReader">
<h1 id="Lucene_Net_Index_CompositeReader" data-uid="Lucene.Net.Index.CompositeReader" class="text-break">Class CompositeReader
</h1>
<div class="markdown level0 summary"><p>Instances of this reader type can only
be used to get stored fields from the underlying <a class="xref" href="Lucene.Net.Index.AtomicReader.html">AtomicReader</a>s,
but it is not possible to directly retrieve postings. To do that, get
the <a class="xref" href="Lucene.Net.Index.AtomicReaderContext.html">AtomicReaderContext</a> for all sub-readers via <a class="xref" href="Lucene.Net.Index.AtomicReaderContext.html#Lucene_Net_Index_AtomicReaderContext_Leaves">Leaves</a>.
Alternatively, you can mimic an <a class="xref" href="Lucene.Net.Index.AtomicReader.html">AtomicReader</a> (with a serious slowdown),
by wrapping composite readers with <a class="xref" href="Lucene.Net.Index.SlowCompositeReaderWrapper.html">SlowCompositeReaderWrapper</a>.</p>
<p><p><a class="xref" href="Lucene.Net.Index.IndexReader.html">IndexReader</a> instances for indexes on disk are usually constructed
with a call to one of the static <code>DirectoryReader.Open()</code> methods,
e.g. <a class="xref" href="Lucene.Net.Index.DirectoryReader.html#Lucene_Net_Index_DirectoryReader_Open_Lucene_Net_Store_Directory_">Open(Directory)</a>. <a class="xref" href="Lucene.Net.Index.DirectoryReader.html">DirectoryReader</a> implements
the <a class="xref" href="Lucene.Net.Index.CompositeReader.html">CompositeReader</a> interface, it is not possible to directly get postings.
<p> Concrete subclasses of <a class="xref" href="Lucene.Net.Index.IndexReader.html">IndexReader</a> are usually constructed with a call to
one of the static <code>Open()</code> methods, e.g. <a class="xref" href="Lucene.Net.Index.DirectoryReader.html#Lucene_Net_Index_DirectoryReader_Open_Lucene_Net_Store_Directory_">Open(Directory)</a>.</p>
<p><p> For efficiency, in this API documents are often referred to via
<em>document numbers</em>, non-negative integers which each name a unique
document in the index. These document numbers are ephemeral -- they may change
as documents are added to and deleted from an index. Clients should thus not
rely on a given document having the same number between sessions.</p>
<p><p>
<strong>NOTE</strong>:
<a class="xref" href="Lucene.Net.Index.IndexReader.html">IndexReader</a> instances are completely thread
safe, meaning multiple threads can call any of its methods,
concurrently. If your application requires external
synchronization, you should <strong>not</strong> synchronize on the
<a class="xref" href="Lucene.Net.Index.IndexReader.html">IndexReader</a> instance; use your own
(non-Lucene) objects instead.</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.Index.IndexReader.html">IndexReader</a></div>
<div class="level2"><span class="xref">CompositeReader</span></div>
<div class="level3"><a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html">BaseCompositeReader&lt;R&gt;</a></div>
</div>
<div classs="implements">
<h5>Implements</h5>
<div><span class="xref">System.IDisposable</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_AddReaderClosedListener_Lucene_Net_Index_IndexReader_IReaderClosedListener_">IndexReader.AddReaderClosedListener(IndexReader.IReaderClosedListener)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_RemoveReaderClosedListener_Lucene_Net_Index_IndexReader_IReaderClosedListener_">IndexReader.RemoveReaderClosedListener(IndexReader.IReaderClosedListener)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_RegisterParentReader_Lucene_Net_Index_IndexReader_">IndexReader.RegisterParentReader(IndexReader)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_RefCount">IndexReader.RefCount</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_IncRef">IndexReader.IncRef()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_TryIncRef">IndexReader.TryIncRef()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_DecRef">IndexReader.DecRef()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_EnsureOpen">IndexReader.EnsureOpen()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Equals_System_Object_">IndexReader.Equals(Object)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_GetHashCode">IndexReader.GetHashCode()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Store_Directory_">IndexReader.Open(Directory)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Store_Directory_System_Int32_">IndexReader.Open(Directory, Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Index_IndexWriter_System_Boolean_">IndexReader.Open(IndexWriter, Boolean)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Index_IndexCommit_">IndexReader.Open(IndexCommit)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Index_IndexCommit_System_Int32_">IndexReader.Open(IndexCommit, Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_GetTermVectors_System_Int32_">IndexReader.GetTermVectors(Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_GetTermVector_System_Int32_System_String_">IndexReader.GetTermVector(Int32, String)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_NumDocs">IndexReader.NumDocs</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_MaxDoc">IndexReader.MaxDoc</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_NumDeletedDocs">IndexReader.NumDeletedDocs</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Document_System_Int32_Lucene_Net_Index_StoredFieldVisitor_">IndexReader.Document(Int32, StoredFieldVisitor)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Document_System_Int32_">IndexReader.Document(Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Document_System_Int32_System_Collections_Generic_ISet_System_String__">IndexReader.Document(Int32, ISet&lt;String&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_HasDeletions">IndexReader.HasDeletions</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Dispose">IndexReader.Dispose()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Dispose_System_Boolean_">IndexReader.Dispose(Boolean)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_DoClose">IndexReader.DoClose()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Leaves">IndexReader.Leaves</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_CoreCacheKey">IndexReader.CoreCacheKey</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_CombinedCoreAndDeletesKey">IndexReader.CombinedCoreAndDeletesKey</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_DocFreq_Lucene_Net_Index_Term_">IndexReader.DocFreq(Term)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_TotalTermFreq_Lucene_Net_Index_Term_">IndexReader.TotalTermFreq(Term)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_GetSumDocFreq_System_String_">IndexReader.GetSumDocFreq(String)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_GetDocCount_System_String_">IndexReader.GetDocCount(String)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_GetSumTotalTermFreq_System_String_">IndexReader.GetSumTotalTermFreq(String)</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.Index.html">Lucene.Net.Index</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Index_CompositeReader_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class CompositeReader : IndexReader, IDisposable</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Index_CompositeReader__ctor_" data-uid="Lucene.Net.Index.CompositeReader.#ctor*"></a>
<h4 id="Lucene_Net_Index_CompositeReader__ctor" data-uid="Lucene.Net.Index.CompositeReader.#ctor">CompositeReader()</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">protected CompositeReader()</code></pre>
</div>
<h3 id="properties">Properties
</h3>
<span class="small pull-right mobile-hide">
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<a id="Lucene_Net_Index_CompositeReader_Context_" data-uid="Lucene.Net.Index.CompositeReader.Context*"></a>
<h4 id="Lucene_Net_Index_CompositeReader_Context" data-uid="Lucene.Net.Index.CompositeReader.Context">Context</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 sealed IndexReaderContext Context { 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.Index.IndexReaderContext.html">IndexReaderContext</a></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Context">IndexReader.Context</a></div>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Index_CompositeReader_GetSequentialSubReaders_" data-uid="Lucene.Net.Index.CompositeReader.GetSequentialSubReaders*"></a>
<h4 id="Lucene_Net_Index_CompositeReader_GetSequentialSubReaders" data-uid="Lucene.Net.Index.CompositeReader.GetSequentialSubReaders">GetSequentialSubReaders()</h4>
<div class="markdown level1 summary"><p>Expert: returns the sequential sub readers that this
reader is logically composed of. This method may not
return <code>null</code>.</p>
<p><p><strong>NOTE:</strong> In contrast to previous Lucene versions this method
is no longer public, code that wants to get all <a class="xref" href="Lucene.Net.Index.AtomicReader.html">AtomicReader</a>s
this composite is composed of should use <a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Leaves">Leaves</a>. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected abstract IList&lt;IndexReader&gt; GetSequentialSubReaders()</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.Collections.Generic.IList</span>&lt;<a class="xref" href="Lucene.Net.Index.IndexReader.html">IndexReader</a>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Index_CompositeReader_GetSequentialSubReaders_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Leaves">Leaves</a></div>
</div>
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<a id="Lucene_Net_Index_CompositeReader_ToString_" data-uid="Lucene.Net.Index.CompositeReader.ToString*"></a>
<h4 id="Lucene_Net_Index_CompositeReader_ToString" data-uid="Lucene.Net.Index.CompositeReader.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="implements">Implements</h3>
<div>
<span class="xref">System.IDisposable</span>
</div>
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