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<title>Interface IIndexed&lt;T&gt;
| Apache Lucene.NET 4.8.0 Documentation </title>
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<article class="content wrap" id="_content" data-uid="Lucene.Net.Support.C5.IIndexed`1">
<h1 id="Lucene_Net_Support_C5_IIndexed_1" data-uid="Lucene.Net.Support.C5.IIndexed`1" class="text-break">Interface IIndexed&lt;T&gt;
</h1>
<div class="markdown level0 summary"><p>A sequenced collection, where indices of items in the order are maintained</p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ISequenced-1.html#Lucene_Net_Support_C5_ISequenced_1_GetSequencedHashCode">ISequenced&lt;T&gt;.GetSequencedHashCode()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ISequenced-1.html#Lucene_Net_Support_C5_ISequenced_1_SequencedEquals_Lucene_Net_Support_C5_ISequenced__0__">ISequenced&lt;T&gt;.SequencedEquals(ISequenced&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_ContainsSpeed">ICollection&lt;T&gt;.ContainsSpeed</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Count">ICollection&lt;T&gt;.Count</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_IsReadOnly">ICollection&lt;T&gt;.IsReadOnly</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Add__0_">ICollection&lt;T&gt;.Add(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_CopyTo__0___System_Int32_">ICollection&lt;T&gt;.CopyTo(T[], Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_GetUnsequencedHashCode">ICollection&lt;T&gt;.GetUnsequencedHashCode()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_UnsequencedEquals_Lucene_Net_Support_C5_ICollection__0__">ICollection&lt;T&gt;.UnsequencedEquals(ICollection&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Contains__0_">ICollection&lt;T&gt;.Contains(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_ContainsCount__0_">ICollection&lt;T&gt;.ContainsCount(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_UniqueItems">ICollection&lt;T&gt;.UniqueItems()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_ItemMultiplicities">ICollection&lt;T&gt;.ItemMultiplicities()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_ContainsAll_System_Collections_Generic_IEnumerable__0__">ICollection&lt;T&gt;.ContainsAll(System.Collections.Generic.IEnumerable&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Find__0__">ICollection&lt;T&gt;.Find(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_FindOrAdd__0__">ICollection&lt;T&gt;.FindOrAdd(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Update__0_">ICollection&lt;T&gt;.Update(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Update__0__0__">ICollection&lt;T&gt;.Update(T, T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_UpdateOrAdd__0_">ICollection&lt;T&gt;.UpdateOrAdd(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_UpdateOrAdd__0__0__">ICollection&lt;T&gt;.UpdateOrAdd(T, T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Remove__0_">ICollection&lt;T&gt;.Remove(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Remove__0__0__">ICollection&lt;T&gt;.Remove(T, T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_RemoveAllCopies__0_">ICollection&lt;T&gt;.RemoveAllCopies(T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_RemoveAll_System_Collections_Generic_IEnumerable__0__">ICollection&lt;T&gt;.RemoveAll(System.Collections.Generic.IEnumerable&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_Clear">ICollection&lt;T&gt;.Clear()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollection-1.html#Lucene_Net_Support_C5_ICollection_1_RetainAll_System_Collections_Generic_IEnumerable__0__">ICollection&lt;T&gt;.RetainAll(System.Collections.Generic.IEnumerable&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IExtensible-1.html#Lucene_Net_Support_C5_IExtensible_1_AllowsDuplicates">IExtensible&lt;T&gt;.AllowsDuplicates</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IExtensible-1.html#Lucene_Net_Support_C5_IExtensible_1_EqualityComparer">IExtensible&lt;T&gt;.EqualityComparer</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IExtensible-1.html#Lucene_Net_Support_C5_IExtensible_1_DuplicatesByCounting">IExtensible&lt;T&gt;.DuplicatesByCounting</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IExtensible-1.html#Lucene_Net_Support_C5_IExtensible_1_AddAll_System_Collections_Generic_IEnumerable__0__">IExtensible&lt;T&gt;.AddAll(System.Collections.Generic.IEnumerable&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IExtensible-1.html#Lucene_Net_Support_C5_IExtensible_1_Check">IExtensible&lt;T&gt;.Check()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IDirectedCollectionValue-1.html#Lucene_Net_Support_C5_IDirectedCollectionValue_1_Backwards">IDirectedCollectionValue&lt;T&gt;.Backwards()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IDirectedCollectionValue-1.html#Lucene_Net_Support_C5_IDirectedCollectionValue_1_FindLast_Func__0_System_Boolean___0__">IDirectedCollectionValue&lt;T&gt;.FindLast(Func&lt;T, Boolean&gt;, T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ListenableEvents">ICollectionValue&lt;T&gt;.ListenableEvents</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ActiveEvents">ICollectionValue&lt;T&gt;.ActiveEvents</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_CollectionChanged">ICollectionValue&lt;T&gt;.CollectionChanged</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_CollectionCleared">ICollectionValue&lt;T&gt;.CollectionCleared</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ItemsAdded">ICollectionValue&lt;T&gt;.ItemsAdded</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ItemInserted">ICollectionValue&lt;T&gt;.ItemInserted</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ItemsRemoved">ICollectionValue&lt;T&gt;.ItemsRemoved</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ItemRemovedAt">ICollectionValue&lt;T&gt;.ItemRemovedAt</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_IsEmpty">ICollectionValue&lt;T&gt;.IsEmpty</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_CountSpeed">ICollectionValue&lt;T&gt;.CountSpeed</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ToArray">ICollectionValue&lt;T&gt;.ToArray()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Apply_Action__0__">ICollectionValue&lt;T&gt;.Apply(Action&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Exists_Func__0_System_Boolean__">ICollectionValue&lt;T&gt;.Exists(Func&lt;T, Boolean&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Find_Func__0_System_Boolean___0__">ICollectionValue&lt;T&gt;.Find(Func&lt;T, Boolean&gt;, T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_All_Func__0_System_Boolean__">ICollectionValue&lt;T&gt;.All(Func&lt;T, Boolean&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Choose">ICollectionValue&lt;T&gt;.Choose()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Filter_Func__0_System_Boolean__">ICollectionValue&lt;T&gt;.Filter(Func&lt;T, Boolean&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IShowable.html#Lucene_Net_Support_C5_IShowable_Show_System_Text_StringBuilder_System_Int32__IFormatProvider_">IShowable.Show(System.Text.StringBuilder, Int32, IFormatProvider)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IDirectedEnumerable-1.html#Lucene_Net_Support_C5_IDirectedEnumerable_1_Direction">IDirectedEnumerable&lt;T&gt;.Direction</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IReadOnlyList-1.html#Lucene_Net_Support_C5_IReadOnlyList_1_Item_System_Int32_">IReadOnlyList&lt;T&gt;.Item[Int32]</a>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Support.C5.html">Lucene.Net.Support.C5</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Support_C5_IIndexed_1_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public interface IIndexed&lt;T&gt; : ISequenced&lt;T&gt;, ICollection&lt;T&gt;, IExtensible&lt;T&gt;, System.Collections.Generic.ICollection&lt;T&gt;, IDirectedCollectionValue&lt;T&gt;, ICollectionValue&lt;T&gt;, IShowable, IFormattable, IDirectedEnumerable&lt;T&gt;, IReadOnlyList&lt;T&gt;, IReadOnlyCollection&lt;T&gt;, System.Collections.Generic.IEnumerable&lt;T&gt;, System.Collections.IEnumerable</code></pre>
</div>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T</span></td>
<td></td>
</tr>
</tbody>
</table>
<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-beta00007/websites/apidocs/apiSpec/new?filename=Lucene_Net_Support_C5_IIndexed_1_IndexingSpeed.md&amp;value=---%0Auid%3A%20Lucene.Net.Support.C5.IIndexed%601.IndexingSpeed%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>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/Shazwazza/lucenenet/blob/docs-update-jan2020/src/Lucene.Net/Support/C5.Support.cs/#L6328">View Source</a>
</span>
<a id="Lucene_Net_Support_C5_IIndexed_1_IndexingSpeed_" data-uid="Lucene.Net.Support.C5.IIndexed`1.IndexingSpeed*"></a>
<h4 id="Lucene_Net_Support_C5_IIndexed_1_IndexingSpeed" data-uid="Lucene.Net.Support.C5.IIndexed`1.IndexingSpeed">IndexingSpeed</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">Speed IndexingSpeed { 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.Support.C5.Speed.html">Speed</a></td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00007/websites/apidocs/apiSpec/new?filename=Lucene_Net_Support_C5_IIndexed_1_Item_System_Int32_System_Int32_.md&amp;value=---%0Auid%3A%20Lucene.Net.Support.C5.IIndexed%601.Item(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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<span class="small pull-right mobile-hide">
<a href="https://github.com/Shazwazza/lucenenet/blob/docs-update-jan2020/src/Lucene.Net/Support/C5.Support.cs/#L6336">View Source</a>
</span>
<a id="Lucene_Net_Support_C5_IIndexed_1_Item_" data-uid="Lucene.Net.Support.C5.IIndexed`1.Item*"></a>
<h4 id="Lucene_Net_Support_C5_IIndexed_1_Item_System_Int32_System_Int32_" data-uid="Lucene.Net.Support.C5.IIndexed`1.Item(System.Int32,System.Int32)">Item[Int32, Int32]</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">IDirectedCollectionValue&lt;T&gt; this[int start, int count] { 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">start</span></td>
<td><p>The low index of the interval (inclusive).</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">count</span></td>
<td><p>The size of the range.</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><a class="xref" href="Lucene.Net.Support.C5.IDirectedCollectionValue-1.html">IDirectedCollectionValue</a>&lt;T&gt;</td>
<td><p>The directed collection of items in a specific index interval.</p>
</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-beta00007/websites/apidocs/apiSpec/new?filename=Lucene_Net_Support_C5_IIndexed_1_FindIndex_Func__0_System_Boolean__.md&amp;value=---%0Auid%3A%20Lucene.Net.Support.C5.IIndexed%601.FindIndex(Func%7B%600%2CSystem.Boolean%7D)%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 href="https://github.com/Shazwazza/lucenenet/blob/docs-update-jan2020/src/Lucene.Net/Support/C5.Support.cs/#L6363">View Source</a>
</span>
<a id="Lucene_Net_Support_C5_IIndexed_1_FindIndex_" data-uid="Lucene.Net.Support.C5.IIndexed`1.FindIndex*"></a>
<h4 id="Lucene_Net_Support_C5_IIndexed_1_FindIndex_Func__0_System_Boolean__" data-uid="Lucene.Net.Support.C5.IIndexed`1.FindIndex(Func{`0,System.Boolean})">FindIndex(Func&lt;T, Boolean&gt;)</h4>
<div class="markdown level1 summary"><p>Check if there exists an item that satisfies a
specific predicate in this collection and return the index of the first one.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">int FindIndex(Func&lt;T, bool&gt; predicate)</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">Func</span>&lt;T, <span class="xref">System.Boolean</span>&gt;</td>
<td><span class="parametername">predicate</span></td>
<td><p>A delegate
(<span class="xref">Func&lt;, &gt;</span> with <pre><code>R == bool</code></pre>) defining the predicate</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>the index, if found, a negative value else</p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Support_C5_IIndexed_1_FindLastIndex_" data-uid="Lucene.Net.Support.C5.IIndexed`1.FindLastIndex*"></a>
<h4 id="Lucene_Net_Support_C5_IIndexed_1_FindLastIndex_Func__0_System_Boolean__" data-uid="Lucene.Net.Support.C5.IIndexed`1.FindLastIndex(Func{`0,System.Boolean})">FindLastIndex(Func&lt;T, Boolean&gt;)</h4>
<div class="markdown level1 summary"><p>Check if there exists an item that satisfies a
specific predicate in this collection and return the index of the last one.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">int FindLastIndex(Func&lt;T, bool&gt; predicate)</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">Func</span>&lt;T, <span class="xref">System.Boolean</span>&gt;</td>
<td><span class="parametername">predicate</span></td>
<td><p>A delegate
(<span class="xref">Func&lt;, &gt;</span> with <pre><code>R == bool</code></pre>) defining the predicate</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>the index, if found, a negative value else</p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Support_C5_IIndexed_1_IndexOf_" data-uid="Lucene.Net.Support.C5.IIndexed`1.IndexOf*"></a>
<h4 id="Lucene_Net_Support_C5_IIndexed_1_IndexOf__0_" data-uid="Lucene.Net.Support.C5.IIndexed`1.IndexOf(`0)">IndexOf(T)</h4>
<div class="markdown level1 summary"><p>Searches for an item in the list going forwards from the start. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">int IndexOf(T item)</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">T</span></td>
<td><span class="parametername">item</span></td>
<td><p>Item to search for.</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>Index of item from start. A negative number if item not found,
namely the one&apos;s complement of the index at which the Add operation would put the item.</p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Support_C5_IIndexed_1_LastIndexOf_" data-uid="Lucene.Net.Support.C5.IIndexed`1.LastIndexOf*"></a>
<h4 id="Lucene_Net_Support_C5_IIndexed_1_LastIndexOf__0_" data-uid="Lucene.Net.Support.C5.IIndexed`1.LastIndexOf(`0)">LastIndexOf(T)</h4>
<div class="markdown level1 summary"><p>Searches for an item in the list going backwards from the end.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">int LastIndexOf(T item)</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">T</span></td>
<td><span class="parametername">item</span></td>
<td><p>Item to search for.</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>Index of of item from the end. A negative number if item not found,
namely the two-complement of the index at which the Add operation would put the item.</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Support_C5_IIndexed_1_RemoveAt_System_Int32_" data-uid="Lucene.Net.Support.C5.IIndexed`1.RemoveAt(System.Int32)">RemoveAt(Int32)</h4>
<div class="markdown level1 summary"><p>Remove the item at a specific position of the list.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">T RemoveAt(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.Int32</span></td>
<td><span class="parametername">index</span></td>
<td><p>The index of the item to remove.</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">T</span></td>
<td><p>The removed item.</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Support_C5_IIndexed_1_RemoveInterval_System_Int32_System_Int32_" data-uid="Lucene.Net.Support.C5.IIndexed`1.RemoveInterval(System.Int32,System.Int32)">RemoveInterval(Int32, Int32)</h4>
<div class="markdown level1 summary"><p>Remove all items in an index interval.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">void RemoveInterval(int start, int count)</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">start</span></td>
<td><p>The index of the first item to remove.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">count</span></td>
<td><p>The number of items to remove.</p>
</td>
</tr>
</tbody>
</table>
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