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﻿<!DOCTYPE html><!--[if IE]><![endif]--><html>    <head>    <meta charset="utf-8">    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">    <title>Class EnumerableExtensions   </title>    <meta name="viewport" content="width=device-width">    <meta name="title" content="Class EnumerableExtensions   ">    <meta name="generator" content="docfx 2.56.2.0">        <link rel="shortcut icon" href="../favicon.ico">    <link rel="stylesheet" href="../styles/docfx.vendor.css">    <link rel="stylesheet" href="../styles/docfx.css">    <link rel="stylesheet" href="../styles/main.css">    <link rel="stylesheet" href="../styles/fix.css">    <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">     <meta property="docfx:navrel" content="../toc.html">    <meta property="docfx:tocrel" content="toc.html">        <meta property="docfx:rel" content="../">    <meta property="docfx:newtab" content="true">  </head>  <body data-spy="scroll" data-target="#affix" 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class="sidetoggle collapse" id="sidetoggle">            <div id="sidetoc"></div>          </div>        </div>        <div class="article row grid-right">          <div class="col-md-10">            <article class="content wrap" id="_content" data-uid="IPA.Utilities.EnumerableExtensions">      <h1 id="IPA_Utilities_EnumerableExtensions" data-uid="IPA.Utilities.EnumerableExtensions" class="text-break">Class EnumerableExtensions  </h1>  <div class="markdown level0 summary"><p>Extensions for <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable&lt;T&gt;</a> that don&apos;t currently exist in <code>System.Linq</code>.</p></div>  <div class="markdown level0 conceptual"></div>  <div class="inheritance">    <h5>Inheritance</h5>    <div class="level0"><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object">Object</a></div>    <div class="level1"><span class="xref">EnumerableExtensions</span></div>  </div>  <div class="inheritedMembers">    <h5>Inherited Members</h5>    <div>      <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.tostring#System_Object_ToString">Object.ToString()</a>    </div>    <div>      <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.equals#System_Object_Equals_System_Object_">Object.Equals(Object)</a>    </div>    <div>      <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.equals#System_Object_Equals_System_Object_System_Object_">Object.Equals(Object, Object)</a>    </div>    <div>      <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.referenceequals#System_Object_ReferenceEquals_System_Object_System_Object_">Object.ReferenceEquals(Object, Object)</a>    </div>    <div>      <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.gethashcode#System_Object_GetHashCode">Object.GetHashCode()</a>    </div>    <div>      <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.gettype#System_Object_GetType">Object.GetType()</a>    </div>    <div>      <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.memberwiseclone#System_Object_MemberwiseClone">Object.MemberwiseClone()</a>    </div>  </div>  <h6><strong>Namespace</strong>: <a class="xref" href="IPA.Utilities.html">IPA.Utilities</a></h6>  <h6><strong>Assembly</strong>: IPA.Loader.dll</h6>  <h5 id="IPA_Utilities_EnumerableExtensions_syntax">Syntax</h5>  <div class="codewrapper">    <pre><code class="lang-csharp hljs">public static class EnumerableExtensions</code></pre>  </div>  <h3 id="methods">Methods  </h3>  <span class="small pull-right mobile-hide">    <span class="divider">|</span>    <a href="https://github.com/bsmg/BeatSaber-IPA-Reloaded/new/master/docs/override/new?filename=IPA_Utilities_EnumerableExtensions_Append__1_System_Collections_Generic_IEnumerable___0____0_.md&amp;value=---%0Auid%3A%20IPA.Utilities.EnumerableExtensions.Append%60%601(System.Collections.Generic.IEnumerable%7B%60%600%7D%2C%60%600)%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/bsmg/BeatSaber-IPA-Reloaded/blob/d795654028f602d2b89b0512ac95c12f123008a4/IPA.Loader/Utilities/EnumerableExtensions.cs/#L98">View Source</a>  </span>  <a id="IPA_Utilities_EnumerableExtensions_Append_" data-uid="IPA.Utilities.EnumerableExtensions.Append*"></a>  <h4 id="IPA_Utilities_EnumerableExtensions_Append__1_System_Collections_Generic_IEnumerable___0____0_" data-uid="IPA.Utilities.EnumerableExtensions.Append``1(System.Collections.Generic.IEnumerable{``0},``0)">Append&lt;T&gt;(IEnumerable&lt;T&gt;, T)</h4>  <div class="markdown level1 summary"><p>Adds a value to the end of the sequence.</p></div>  <div class="markdown level1 conceptual"></div>  <h5 class="decalaration">Declaration</h5>  <div class="codewrapper">    <pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; Append&lt;T&gt;(this IEnumerable&lt;T&gt; seq, T app)</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><span class="parametername">seq</span></td>        <td><p>a sequence of values</p></td>      </tr>      <tr>        <td><span class="xref">T</span></td>        <td><span class="parametername">app</span></td>        <td><p>the value to append to <code data-dev-comment-type="paramref" class="paramref">seq</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><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><p>a new sequence ending with <code data-dev-comment-type="paramref" class="paramref">app</code></p></td>      </tr>    </tbody>  </table>  <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><p>the type of the elements of <code data-dev-comment-type="paramref" class="paramref">seq</code></p></td>      </tr>    </tbody>  </table>  <span class="small pull-right mobile-hide">    <span class="divider">|</span>    <a href="https://github.com/bsmg/BeatSaber-IPA-Reloaded/new/master/docs/override/new?filename=IPA_Utilities_EnumerableExtensions_NonNull__1_System_Collections_Generic_IEnumerable___0__.md&amp;value=---%0Auid%3A%20IPA.Utilities.EnumerableExtensions.NonNull%60%601(System.Collections.Generic.IEnumerable%7B%60%600%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>  </span>  <span class="small pull-right mobile-hide">    <a href="https://github.com/bsmg/BeatSaber-IPA-Reloaded/blob/d795654028f602d2b89b0512ac95c12f123008a4/IPA.Loader/Utilities/EnumerableExtensions.cs/#L173">View Source</a>  </span>  <a id="IPA_Utilities_EnumerableExtensions_NonNull_" data-uid="IPA.Utilities.EnumerableExtensions.NonNull*"></a>  <h4 id="IPA_Utilities_EnumerableExtensions_NonNull__1_System_Collections_Generic_IEnumerable___0__" data-uid="IPA.Utilities.EnumerableExtensions.NonNull``1(System.Collections.Generic.IEnumerable{``0})">NonNull&lt;T&gt;(IEnumerable&lt;T&gt;)</h4>  <div class="markdown level1 summary"><p>LINQ-style extension method that filters <span class="xref">null</span> elements out of an enumeration.</p></div>  <div class="markdown level1 conceptual"></div>  <h5 class="decalaration">Declaration</h5>  <div class="codewrapper">    <pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; NonNull&lt;T&gt;(this IEnumerable&lt;T&gt; self)    where T : class</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><span class="parametername">self</span></td>        <td><p>the enumeration to filter</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><p>a filtered enumerable</p></td>      </tr>    </tbody>  </table>  <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><p>the type of the enumeration</p></td>      </tr>    </tbody>  </table>  <span class="small pull-right mobile-hide">    <span class="divider">|</span>    <a href="https://github.com/bsmg/BeatSaber-IPA-Reloaded/new/master/docs/override/new?filename=IPA_Utilities_EnumerableExtensions_NonNull__1_System_Collections_Generic_IEnumerable_System_Nullable___0___.md&amp;value=---%0Auid%3A%20IPA.Utilities.EnumerableExtensions.NonNull%60%601(System.Collections.Generic.IEnumerable%7BSystem.Nullable%7B%60%600%7D%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>  </span>  <span class="small pull-right mobile-hide">    <a href="https://github.com/bsmg/BeatSaber-IPA-Reloaded/blob/d795654028f602d2b89b0512ac95c12f123008a4/IPA.Loader/Utilities/EnumerableExtensions.cs/#L193">View Source</a>  </span>  <a id="IPA_Utilities_EnumerableExtensions_NonNull_" data-uid="IPA.Utilities.EnumerableExtensions.NonNull*"></a>  <h4 id="IPA_Utilities_EnumerableExtensions_NonNull__1_System_Collections_Generic_IEnumerable_System_Nullable___0___" data-uid="IPA.Utilities.EnumerableExtensions.NonNull``1(System.Collections.Generic.IEnumerable{System.Nullable{``0}})">NonNull&lt;T&gt;(IEnumerable&lt;Nullable&lt;T&gt;&gt;)</h4>  <div class="markdown level1 summary"><p>LINQ-style extension method that filters <span class="xref">null</span> elements from an enumeration of nullable types.</p></div>  <div class="markdown level1 conceptual"></div>  <h5 class="decalaration">Declaration</h5>  <div class="codewrapper">    <pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; NonNull&lt;T&gt;(this IEnumerable&lt;T?&gt; self)    where T : struct</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.nullable-1">Nullable</a>&lt;T&gt;&gt;</td>        <td><span class="parametername">self</span></td>        <td><p>the enumeration to filter</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><p>a filtered enumerable</p></td>      </tr>    </tbody>  </table>  <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><p>the underlying type of the nullable enumeration</p></td>      </tr>    </tbody>  </table>  <span class="small pull-right mobile-hide">    <span class="divider">|</span>    <a 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id="IPA_Utilities_EnumerableExtensions_NonNull__2_System_Collections_Generic_IEnumerable___0__System_Func___0___1__" data-uid="IPA.Utilities.EnumerableExtensions.NonNull``2(System.Collections.Generic.IEnumerable{``0},System.Func{``0,``1})">NonNull&lt;T, U&gt;(IEnumerable&lt;T&gt;, Func&lt;T, U&gt;)</h4>  <div class="markdown level1 summary"><p>LINQ-style extension method that filters <span class="xref">null</span> elements out of an enumeration based on a converter.</p></div>  <div class="markdown level1 conceptual"></div>  <h5 class="decalaration">Declaration</h5>  <div class="codewrapper">    <pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; NonNull&lt;T, U&gt;(this IEnumerable&lt;T&gt; self, Func&lt;T, U&gt; pred)    where U : class</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><span class="parametername">self</span></td>        <td><p>the enumeration to filter</p></td>      </tr>      <tr>        <td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.func-2">Func</a>&lt;T, U&gt;</td>        <td><span class="parametername">pred</span></td>        <td><p>the predicate to select for filtering</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><p>a filtered enumerable</p></td>      </tr>    </tbody>  </table>  <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><p>the type of the enumeration</p></td>      </tr>      <tr>        <td><span class="parametername">U</span></td>        <td><p>the type to compare to null</p></td>      </tr>    </tbody>  </table>  <span class="small pull-right mobile-hide">    <span class="divider">|</span>    <a 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id="IPA_Utilities_EnumerableExtensions_NonNull__2_System_Collections_Generic_IEnumerable___0__System_Func___0_System_Nullable___1___" data-uid="IPA.Utilities.EnumerableExtensions.NonNull``2(System.Collections.Generic.IEnumerable{``0},System.Func{``0,System.Nullable{``1}})">NonNull&lt;T, U&gt;(IEnumerable&lt;T&gt;, Func&lt;T, Nullable&lt;U&gt;&gt;)</h4>  <div class="markdown level1 summary"><p>LINQ-style extension method that filters <span class="xref">null</span> elements out of an enumeration based on a converter to a nullable type.</p></div>  <div class="markdown level1 conceptual"></div>  <h5 class="decalaration">Declaration</h5>  <div class="codewrapper">    <pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; NonNull&lt;T, U&gt;(this IEnumerable&lt;T&gt; self, Func&lt;T, U?&gt; pred)    where U : struct</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><span class="parametername">self</span></td>        <td><p>the enumeration to filter</p></td>      </tr>      <tr>        <td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.func-2">Func</a>&lt;T, <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.nullable-1">Nullable</a>&lt;U&gt;&gt;</td>        <td><span class="parametername">pred</span></td>        <td><p>the predicate to select for filtering</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><p>a filtered enumerable</p></td>      </tr>    </tbody>  </table>  <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><p>the type of the enumeration</p></td>      </tr>      <tr>        <td><span class="parametername">U</span></td>        <td><p>the type of the predicate&apos;s resulting nullable</p></td>      </tr>    </tbody>  </table>  <span class="small pull-right mobile-hide">    <span class="divider">|</span>    <a 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data-uid="IPA.Utilities.EnumerableExtensions.Prepend``1(System.Collections.Generic.IEnumerable{``0},``0)">Prepend&lt;T&gt;(IEnumerable&lt;T&gt;, T)</h4>  <div class="markdown level1 summary"><p>Adds a value to the beginning of the sequence.</p></div>  <div class="markdown level1 conceptual"></div>  <h5 class="decalaration">Declaration</h5>  <div class="codewrapper">    <pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; Prepend&lt;T&gt;(this IEnumerable&lt;T&gt; seq, T prep)</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="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><span class="parametername">seq</span></td>        <td><p>a sequence of values</p></td>      </tr>      <tr>        <td><span class="xref">T</span></td>        <td><span class="parametername">prep</span></td>        <td><p>the value to prepend to <code data-dev-comment-type="paramref" class="paramref">seq</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><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>        <td><p>a new sequence beginning with <code data-dev-comment-type="paramref" class="paramref">prep</code></p></td>      </tr>    </tbody>  </table>  <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><p>the type of the elements of <code data-dev-comment-type="paramref" class="paramref">seq</code></p></td>      </tr>    </tbody>  </table></article>          </div>                    <div class="hidden-sm col-md-2" role="complementary">            <div class="sideaffix">              <div class="contribution">                <ul class="nav">                  <li>                    <a href="https://github.com/bsmg/BeatSaber-IPA-Reloaded/new/master/docs/override/new?filename=IPA_Utilities_EnumerableExtensions.md&amp;value=---%0Auid%3A%20IPA.Utilities.EnumerableExtensions%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" class="contribution-link">Improve this Doc</a>                  </li>                  <li>                    <a 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