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<h1 id="CapyKit_Extensions_LINQExtensions"> Class LINQExtensions</h1>
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<p>Namespace: <a href="CapyKit.Extensions.html">CapyKit.Extensions</a><br>
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Assembly: CapyKit.dll</p>
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<p>Provides static extension methods for performing common LINQ operations on <span class="xref">System.Collections.Generic.IEnumerable`1</span> and <span class="xref">System.Linq.IQueryable`1</span> collections.</p>
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<pre><code class="lang-csharp">public static class LINQExtensions
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</code></pre>
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<h4 id="inheritance">Inheritance</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.object">object</a> ←
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<a href="CapyKit.Extensions.LINQExtensions.html">LINQExtensions</a></p>
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<h4 id="inherited-members">Inherited Members</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object)">object.Equals(object?)</a>,
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<a href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object-system-object)">object.Equals(object?, object?)</a>,
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<a href="https://learn.microsoft.com/dotnet/api/system.object.gethashcode">object.GetHashCode()</a>,
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<a href="https://learn.microsoft.com/dotnet/api/system.object.gettype">object.GetType()</a>,
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<a href="https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone">object.MemberwiseClone()</a>,
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<a href="https://learn.microsoft.com/dotnet/api/system.object.referenceequals">object.ReferenceEquals(object?, object?)</a>,
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<a href="https://learn.microsoft.com/dotnet/api/system.object.tostring">object.ToString()</a></p>
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<h4 id="extension-methods">Extension Methods</h4>
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<p><a href="CapyKit.Extensions.ObjectExtensions.html#CapyKit_Extensions_ObjectExtensions_UpdateProperties_System_Object_System_Object_">ObjectExtensions.UpdateProperties(object, object)</a></p>
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<h2 id="methods">Methods</h2>
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<h3 id="CapyKit_Extensions_LINQExtensions_Distinct__2_System_Collections_Generic_IEnumerable___0__System_Func___0___1__"> Distinct<T, U>(IEnumerable<T>, Func<T, U>)</h3>
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<p>Enumerates distinct items in this collection as defined by the key <code class="paramref">property</code>.</p>
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<pre><code class="lang-csharp">public static IEnumerable<T> Distinct<T, U>(this IEnumerable<T> items, Func<T, U> property)
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</code></pre>
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<h4 id="parameters">Parameters</h4>
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<p><code>items</code> <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><T></p>
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<p>The items to act on.</p>
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<p><code>property</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, U></p>
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<p>The property.</p>
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<h4 id="returns">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><T></p>
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<p>An enumerator that allows foreach to be used to process distinct items in this collection.</p>
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<h4 id="type-parameters">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter of the parent object.</p>
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<p><code>U</code></p>
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<p>Generic type parameter property value.</p>
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<h3 id="CapyKit_Extensions_LINQExtensions_Filter__1_System_Collections_Generic_IEnumerable___0__System_Func___0_System_Boolean__"> Filter<T>(IEnumerable<T>, Func<T, bool>)</h3>
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<p>Filters out items matching a <code class="paramref">predicate</code> from the collection.</p>
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<pre><code class="lang-csharp">public static IEnumerable<T> Filter<T>(this IEnumerable<T> source, Func<T, bool> predicate)
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</code></pre>
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<h4 id="parameters-1">Parameters</h4>
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<p><code>source</code> <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><T></p>
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<p>The source to act on.</p>
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<p><code>predicate</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, <a href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a>></p>
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<p>The predicate.</p>
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<h4 id="returns-1">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><T></p>
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<p>An enumerator that allows foreach to be used to process remove in this collection.</p>
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<h4 id="type-parameters-1">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter.</p>
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<h3 id="CapyKit_Extensions_LINQExtensions_Filter__1_System_Linq_IQueryable___0__System_Linq_Expressions_Expression_System_Func___0_System_Boolean___"> Filter<T>(IQueryable<T>, Expression<Func<T, bool>>)</h3>
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<p>Filters out items matching a <code class="paramref">predicate</code> from the collection.</p>
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<pre><code class="lang-csharp">public static IQueryable<T> Filter<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate)
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</code></pre>
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<h4 id="parameters-2">Parameters</h4>
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<p><code>source</code> <a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1">IQueryable</a><T></p>
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<p>The source to act on.</p>
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<p><code>predicate</code> <a href="https://learn.microsoft.com/dotnet/api/system.linq.expressions.expression-1">Expression</a><<a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, <a href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a>>></p>
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<p>The predicate.</p>
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<h4 id="returns-2">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1">IQueryable</a><T></p>
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<p>An enumerator that allows foreach to be used to process remove in this collection.</p>
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<h4 id="type-parameters-2">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter.</p>
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<h3 id="CapyKit_Extensions_LINQExtensions_LeftOuterJoin__4_System_Linq_IQueryable___0__System_Linq_IQueryable___1__System_Linq_Expressions_Expression_System_Func___0___2___System_Linq_Expressions_Expression_System_Func___1___2___System_Func___0_System_Collections_Generic_IEnumerable___1____3__System_Func___0___1__"> LeftOuterJoin<T, U, TKey, R>(IQueryable<T>, IQueryable<U>, Expression<Func<T, TKey>>, Expression<Func<U, TKey>>, Func<T, IEnumerable<U>, R>, Func<T, U>)</h3>
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<p>An IQueryable<T> extension method that left outer join.</p>
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<pre><code class="lang-csharp">public static IQueryable<R> LeftOuterJoin<T, U, TKey, R>(this IQueryable<T> source, IQueryable<U> inner, Expression<Func<T, TKey>> outerSelector, Expression<Func<U, TKey>> innerSelector, Func<T, IEnumerable<U>, R> resultSelector, Func<T, U> defaultGenerator = null)
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</code></pre>
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<h4 id="parameters-3">Parameters</h4>
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<p><code>source</code> <a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1">IQueryable</a><T></p>
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<p>The source to act on.</p>
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<p><code>inner</code> <a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1">IQueryable</a><U></p>
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<p>The inner.</p>
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<p><code>outerSelector</code> <a href="https://learn.microsoft.com/dotnet/api/system.linq.expressions.expression-1">Expression</a><<a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, TKey>></p>
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<p>The outer selector.</p>
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<p><code>innerSelector</code> <a href="https://learn.microsoft.com/dotnet/api/system.linq.expressions.expression-1">Expression</a><<a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><U, TKey>></p>
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<p>The inner selector.</p>
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<p><code>resultSelector</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-3">Func</a><T, <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><U>, R></p>
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<p>The result selector.</p>
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<p><code>defaultGenerator</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, U></p>
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<p>(Optional) The default generator.</p>
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<h4 id="returns-3">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1">IQueryable</a><R></p>
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<p>An IQueryable<R></p>
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<h4 id="type-parameters-3">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter.</p>
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<p><code>U</code></p>
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<p>Generic type parameter.</p>
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<p><code>TKey</code></p>
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<p>Type of the key.</p>
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<p><code>R</code></p>
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<p>Type of the r.</p>
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<h3 id="CapyKit_Extensions_LINQExtensions_LeftOuterJoin__4_System_Collections_Generic_IEnumerable___0__System_Collections_Generic_IEnumerable___1__System_Func___0___2__System_Func___1___2__System_Func___0_System_Collections_Generic_IEnumerable___1____3__System_Func___0___1__"> LeftOuterJoin<T, U, TKey, R>(IEnumerable<T>, IEnumerable<U>, Func<T, TKey>, Func<U, TKey>, Func<T, IEnumerable<U>, R>, Func<T, U>)</h3>
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<p>An IEnumable<T> extension method that left outer join.</p>
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<pre><code class="lang-csharp">public static IEnumerable<R> LeftOuterJoin<T, U, TKey, R>(this IEnumerable<T> source, IEnumerable<U> inner, Func<T, TKey> outerSelector, Func<U, TKey> innerSelector, Func<T, IEnumerable<U>, R> resultSelector, Func<T, U> defaultGenerator = null)
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</code></pre>
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<h4 id="parameters-4">Parameters</h4>
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<p><code>source</code> <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><T></p>
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<p>The source to act on.</p>
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<p><code>inner</code> <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><U></p>
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<p>The inner.</p>
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<p><code>outerSelector</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, TKey></p>
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<p>The outer selector.</p>
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<p><code>innerSelector</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><U, TKey></p>
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<p>The inner selector.</p>
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<p><code>resultSelector</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-3">Func</a><T, <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><U>, R></p>
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<p>The result selector.</p>
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<p><code>defaultGenerator</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, U></p>
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<p>(Optional) The default generator.</p>
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<h4 id="returns-4">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><R></p>
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<p>An enumerator that allows foreach to be used to process left outter join in this collection.</p>
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<h4 id="type-parameters-4">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter.</p>
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<p><code>U</code></p>
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<p>Generic type parameter.</p>
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<p><code>TKey</code></p>
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<p>Type of the key.</p>
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<p><code>R</code></p>
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<p>Type of the r.</p>
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<h3 id="CapyKit_Extensions_LINQExtensions_Page__1_System_Collections_Generic_IEnumerable___0__System_Int32_System_Int32_"> Page<T>(IEnumerable<T>, int, int)</h3>
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<p>Get a page of items from a collection, skipping <code class="paramref">pageNumber</code> pages of
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<code class="paramref">pageSize</code> items per page.</p>
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<pre><code class="lang-csharp">public static IEnumerable<T> Page<T>(this IEnumerable<T> source, int pageNumber, int pageSize)
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</code></pre>
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<h4 id="parameters-5">Parameters</h4>
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<p><code>source</code> <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><T></p>
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<p>The source to act on.</p>
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<p><code>pageNumber</code> <a href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></p>
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<p>The page number to retrieve.</p>
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<p><code>pageSize</code> <a href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></p>
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<p>Number of items per page.</p>
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<h4 id="returns-5">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><T></p>
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<p>An enumerator that allows foreach to be used to process page in this collection.</p>
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<h4 id="type-parameters-5">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter.</p>
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<h4 id="remarks">Remarks</h4>
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<p>This method uses natural numbering starting at page 1.</p>
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<h4 id="exceptions">Exceptions</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.argumentoutofrangeexception">ArgumentOutOfRangeException</a></p>
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<p>Thrown when <code class="paramref">pageNumber</code> is less than <code>1</code> or if
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<code class="paramref">pageSize</code> is less than
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<code>1</code>.</p>
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<h3 id="CapyKit_Extensions_LINQExtensions_Page__1_System_Linq_IQueryable___0__System_Int32_System_Int32_"> Page<T>(IQueryable<T>, int, int)</h3>
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<p>Get a page of items from a collection, skipping <code class="paramref">pageNumber</code> pages of
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<code class="paramref">pageSize</code> items per page.</p>
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<pre><code class="lang-csharp">public static IQueryable<T> Page<T>(this IQueryable<T> source, int pageNumber, int pageSize)
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</code></pre>
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<h4 id="parameters-6">Parameters</h4>
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<p><code>source</code> <a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1">IQueryable</a><T></p>
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<p>The source to act on.</p>
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<p><code>pageNumber</code> <a href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></p>
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<p>The page number to retrieve.</p>
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<p><code>pageSize</code> <a href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></p>
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<p>.</p>
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<h4 id="returns-6">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1">IQueryable</a><T></p>
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<p>An enumerator that allows foreach to be used to process page in this collection.</p>
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<h4 id="type-parameters-6">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter.</p>
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<h4 id="remarks-1">Remarks</h4>
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<p>This method uses natural numbering starting at page 1.</p>
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<h4 id="exceptions-1">Exceptions</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.argumentoutofrangeexception">ArgumentOutOfRangeException</a></p>
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<p>Thrown when <code class="paramref">pageNumber</code> is less than <code>1</code> or if
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<code class="paramref">pageSize</code> is less than
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<code>1</code>.</p>
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<h3 id="CapyKit_Extensions_LINQExtensions_PageCount__1_System_Collections_Generic_IEnumerable___0__System_Int32_"> PageCount<T>(IEnumerable<T>, int)</h3>
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<p>The number of pages of <code class="paramref">pageSize</code> size in the given collection.</p>
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<pre><code class="lang-csharp">public static int PageCount<T>(this IEnumerable<T> source, int pageSize)
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</code></pre>
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<h4 id="parameters-7">Parameters</h4>
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<p><code>source</code> <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a><T></p>
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<p>The source to act on.</p>
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<p><code>pageSize</code> <a href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></p>
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<p>Size of the page.</p>
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<h4 id="returns-7">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></p>
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<p>An int.</p>
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<h4 id="type-parameters-7">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter.</p>
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<h4 id="exceptions-2">Exceptions</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.argumentoutofrangeexception">ArgumentOutOfRangeException</a></p>
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<p>Thrown when <code class="paramref">pageSize</code> is less than <code>1</code>.</p>
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<h3 id="CapyKit_Extensions_LINQExtensions_PageCount__1_System_Linq_IQueryable___0__System_Int32_"> PageCount<T>(IQueryable<T>, int)</h3>
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<p>The number of pages of <code class="paramref">pageSize</code> size in the given collection.</p>
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<pre><code class="lang-csharp">public static int PageCount<T>(this IQueryable<T> source, int pageSize)
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</code></pre>
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<h4 id="parameters-8">Parameters</h4>
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<p><code>source</code> <a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1">IQueryable</a><T></p>
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<p>The source to act on.</p>
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<p><code>pageSize</code> <a href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></p>
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<p>Size of the page.</p>
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<h4 id="returns-8">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></p>
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<p>An int.</p>
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<h4 id="type-parameters-8">Type Parameters</h4>
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<p><code>T</code></p>
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<p>Generic type parameter.</p>
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<h4 id="exceptions-3">Exceptions</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.argumentoutofrangeexception">ArgumentOutOfRangeException</a></p>
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<p>Thrown when <code class="paramref">pageSize</code> is less than <code>1</code>.</p>
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