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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.FieldComparer">
<h1 id="Lucene_Net_Search_FieldComparer" data-uid="Lucene.Net.Search.FieldComparer" class="text-break">Class FieldComparer
</h1>
<div class="markdown level0 summary"></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">FieldComparer</span></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.FieldComparer-1.html">FieldComparer&lt;T&gt;</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.html">Lucene.Net.Search</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Search_FieldComparer_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class FieldComparer</code></pre>
</div>
<h3 id="properties">Properties
</h3>
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</span>
<a id="Lucene_Net_Search_FieldComparer_Item_" data-uid="Lucene.Net.Search.FieldComparer.Item*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_Item_System_Int32_" data-uid="Lucene.Net.Search.FieldComparer.Item(System.Int32)">Item[Int32]</h4>
<div class="markdown level1 summary"><p>Return the actual value in the slot.
LUCENENET NOTE: This was value(int) in Lucene.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract IComparable this[int slot] { get; }</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.Int32</span></td>
<td><span class="parametername">slot</span></td>
<td><p>The value </p>
</td>
</tr>
</tbody>
</table>
<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.IComparable</span></td>
<td><p>Value in this slot </p>
</td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</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_FieldComparer_Compare_System_Int32_System_Int32_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.FieldComparer.Compare(System.Int32%2CSystem.Int32)%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_FieldComparer_Compare_" data-uid="Lucene.Net.Search.FieldComparer.Compare*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_Compare_System_Int32_System_Int32_" data-uid="Lucene.Net.Search.FieldComparer.Compare(System.Int32,System.Int32)">Compare(Int32, Int32)</h4>
<div class="markdown level1 summary"><p>Compare hit at <code data-dev-comment-type="paramref" class="paramref">slot1</code> with hit at <code data-dev-comment-type="paramref" class="paramref">slot2</code>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract int Compare(int slot1, int slot2)</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.Int32</span></td>
<td><span class="parametername">slot1</span></td>
<td><p>first slot to compare </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">slot2</span></td>
<td><p>second slot to compare </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.Int32</span></td>
<td><p>any N &lt; 0 if <code data-dev-comment-type="paramref" class="paramref">slot2</code>&apos;s value is sorted after
<code data-dev-comment-type="paramref" class="paramref">slot1</code>, any N &gt; 0 if the <code data-dev-comment-type="paramref" class="paramref">slot2</code>&apos;s value is sorted before
<code data-dev-comment-type="paramref" class="paramref">slot1</code> and 0 if they are equal </p>
</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_FieldComparer_CompareBottom_System_Int32_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.FieldComparer.CompareBottom(System.Int32)%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_FieldComparer_CompareBottom_" data-uid="Lucene.Net.Search.FieldComparer.CompareBottom*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_CompareBottom_System_Int32_" data-uid="Lucene.Net.Search.FieldComparer.CompareBottom(System.Int32)">CompareBottom(Int32)</h4>
<div class="markdown level1 summary"><p>Compare the bottom of the queue with this doc. This will
only invoked after setBottom has been called. This
should return the same result as
<a class="xref" href="Lucene.Net.Search.FieldComparer.html#Lucene_Net_Search_FieldComparer_Compare_System_Int32_System_Int32_">Compare(Int32, Int32)</a> as if bottom were slot1 and the new
document were slot 2.</p>
<p>For a search that hits many results, this method
will be the hotspot (invoked by far the most
frequently).</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract int CompareBottom(int doc)</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.Int32</span></td>
<td><span class="parametername">doc</span></td>
<td><p>Doc that was hit </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.Int32</span></td>
<td><p>Any N &lt; 0 if the doc&apos;s value is sorted after
the bottom entry (not competitive), any N &gt; 0 if the
doc&apos;s value is sorted before the bottom entry and 0 if
they are equal. </p>
</td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Search_FieldComparer_CompareTop_" data-uid="Lucene.Net.Search.FieldComparer.CompareTop*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_CompareTop_System_Int32_" data-uid="Lucene.Net.Search.FieldComparer.CompareTop(System.Int32)">CompareTop(Int32)</h4>
<div class="markdown level1 summary"><p>Compare the top value with this doc. This will
only invoked after <a class="xref" href="Lucene.Net.Search.FieldComparer.html#Lucene_Net_Search_FieldComparer_SetTopValue_System_Object_">SetTopValue(Object)</a> has been called. This
should return the same result as
<a class="xref" href="Lucene.Net.Search.FieldComparer.html#Lucene_Net_Search_FieldComparer_Compare_System_Int32_System_Int32_">Compare(Int32, Int32)</a> as if topValue were slot1 and the new
document were slot 2. This is only called for searches that
use SearchAfter (deep paging).</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract int CompareTop(int doc)</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.Int32</span></td>
<td><span class="parametername">doc</span></td>
<td><p>Doc that was hit </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.Int32</span></td>
<td><p>Any N &lt; 0 if the doc&apos;s value is sorted after
the bottom entry (not competitive), any N &gt; 0 if the
doc&apos;s value is sorted before the bottom entry and 0 if
they are equal. </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_FieldComparer_CompareValues_" data-uid="Lucene.Net.Search.FieldComparer.CompareValues*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_CompareValues_System_Object_System_Object_" data-uid="Lucene.Net.Search.FieldComparer.CompareValues(System.Object,System.Object)">CompareValues(Object, 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 abstract int CompareValues(object first, object second)</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">first</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Object</span></td>
<td><span class="parametername">second</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.Int32</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_FieldComparer_Copy_System_Int32_System_Int32_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.FieldComparer.Copy(System.Int32%2CSystem.Int32)%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_FieldComparer_Copy_" data-uid="Lucene.Net.Search.FieldComparer.Copy*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_Copy_System_Int32_System_Int32_" data-uid="Lucene.Net.Search.FieldComparer.Copy(System.Int32,System.Int32)">Copy(Int32, Int32)</h4>
<div class="markdown level1 summary"><p>This method is called when a new hit is competitive.
You should copy any state associated with this document
that will be required for future comparisons, into the
specified slot.</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 Copy(int slot, int doc)</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.Int32</span></td>
<td><span class="parametername">slot</span></td>
<td><p>Which slot to copy the hit to </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">doc</span></td>
<td><p>DocID relative to current reader </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_FieldComparer_SetBottom_" data-uid="Lucene.Net.Search.FieldComparer.SetBottom*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_SetBottom_System_Int32_" data-uid="Lucene.Net.Search.FieldComparer.SetBottom(System.Int32)">SetBottom(Int32)</h4>
<div class="markdown level1 summary"><p>Set the bottom slot, ie the &quot;weakest&quot; (sorted last)
entry in the queue. When <a class="xref" href="Lucene.Net.Search.FieldComparer.html#Lucene_Net_Search_FieldComparer_CompareBottom_System_Int32_">CompareBottom(Int32)</a> is
called, you should compare against this slot. This
will always be called before <a class="xref" href="Lucene.Net.Search.FieldComparer.html#Lucene_Net_Search_FieldComparer_CompareBottom_System_Int32_">CompareBottom(Int32)</a>.</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 SetBottom(int slot)</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.Int32</span></td>
<td><span class="parametername">slot</span></td>
<td><p>The currently weakest (sorted last) slot in the queue </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_FieldComparer_SetNextReader_" data-uid="Lucene.Net.Search.FieldComparer.SetNextReader*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_SetNextReader_Lucene_Net_Index_AtomicReaderContext_" data-uid="Lucene.Net.Search.FieldComparer.SetNextReader(Lucene.Net.Index.AtomicReaderContext)">SetNextReader(AtomicReaderContext)</h4>
<div class="markdown level1 summary"><p>Set a new <a class="xref" href="Lucene.Net.Index.AtomicReaderContext.html">AtomicReaderContext</a>. All subsequent docIDs are relative to
the current reader (you must add docBase if you need to
map it to a top-level docID).</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract FieldComparer SetNextReader(AtomicReaderContext context)</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><p>Current reader context </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><a class="xref" href="Lucene.Net.Search.FieldComparer.html">FieldComparer</a></td>
<td><p>The comparer to use for this segment; most
comparers can just return &quot;this&quot; to reuse the same
comparer across segments </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>if there is a low-level IO error </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_FieldComparer_SetScorer_" data-uid="Lucene.Net.Search.FieldComparer.SetScorer*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_SetScorer_Lucene_Net_Search_Scorer_" data-uid="Lucene.Net.Search.FieldComparer.SetScorer(Lucene.Net.Search.Scorer)">SetScorer(Scorer)</h4>
<div class="markdown level1 summary"><p>Sets the <a class="xref" href="Lucene.Net.Search.Scorer.html">Scorer</a> to use in case a document&apos;s score is
needed.</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 SetScorer(Scorer scorer)</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.Scorer.html">Scorer</a></td>
<td><span class="parametername">scorer</span></td>
<td><p><a class="xref" href="Lucene.Net.Search.Scorer.html">Scorer</a> instance that you should use to
obtain the current hit&apos;s score, if necessary. </p>
</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_FieldComparer_SetTopValue_System_Object_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.FieldComparer.SetTopValue(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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<a id="Lucene_Net_Search_FieldComparer_SetTopValue_" data-uid="Lucene.Net.Search.FieldComparer.SetTopValue*"></a>
<h4 id="Lucene_Net_Search_FieldComparer_SetTopValue_System_Object_" data-uid="Lucene.Net.Search.FieldComparer.SetTopValue(System.Object)">SetTopValue(Object)</h4>
<div class="markdown level1 summary"><p>Record the top value, for future calls to
<a class="xref" href="Lucene.Net.Search.FieldComparer.html#Lucene_Net_Search_FieldComparer_CompareTop_System_Int32_">CompareTop(Int32)</a>. This is only called for searches that
use SearchAfter (deep paging), and is called before any
calls to <a class="xref" href="Lucene.Net.Search.FieldComparer.html#Lucene_Net_Search_FieldComparer_SetNextReader_Lucene_Net_Index_AtomicReaderContext_">SetNextReader(AtomicReaderContext)</a>.</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 SetTopValue(object 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.Object</span></td>
<td><span class="parametername">value</span></td>
<td></td>
</tr>
</tbody>
</table>
</article>
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