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<h1 id="CapyKit_PropertyComparer_2"> Class PropertyComparer<T, U></h1>
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<p>Namespace: <a href="CapyKit.html">CapyKit</a><br>
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Assembly: CapyKit.dll</p>
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<p>A object comparer that can accept a lambda expression to compare properties.</p>
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<pre><code class="lang-csharp">public class PropertyComparer<T, U> : IEqualityComparer<T>
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</code></pre>
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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 of the property value.</p>
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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.PropertyComparer-2.html">PropertyComparer<T, U></a></p>
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<h4 id="implements">Implements</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.iequalitycomparer-1">IEqualityComparer<T></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__1___0___0_">ObjectExtensions.UpdateProperties<PropertyComparer<T, U>>(PropertyComparer<T, U>, PropertyComparer<T, U>)</a>,
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<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="examples">Examples</h2>
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<p>using System;
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using System.Collections.Generic;
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using System.Linq;</p>
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<p>class Program
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{
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static void Main(string[] args)
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{
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var people = new List<Person>
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{
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new Person { Name = "Alice", Age = 30 }, new Person { Name = "Bob", Age = 30 }, new
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Person { Name = "Charlie", Age = 35 }
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};</p>
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<pre><code> var comparer = new PropertyComparer<Person, int>(p => p.Age);
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var distinctPeople = people.Distinct(comparer).ToList();
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foreach (var person in distinctPeople)
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{
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Console.WriteLine($"{person.Name} - {person.Age}");
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}
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}
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</code></pre>
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<p>}</p>
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<p>class Person
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{
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public string Name { get; set; }
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public int Age { get; set; }
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}</p>
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<h2 id="constructors">Constructors</h2>
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<h3 id="CapyKit_PropertyComparer_2__ctor_System_Func__0__1__"> PropertyComparer(Func<T, U>)</h3>
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<p>Constructor.</p>
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<pre><code class="lang-csharp">public PropertyComparer(Func<T, U> expression)
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</code></pre>
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<h4 id="parameters">Parameters</h4>
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<p><code>expression</code> <a href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, U></p>
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<p>The expression.</p>
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<h2 id="methods">Methods</h2>
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<h3 id="CapyKit_PropertyComparer_2_Equals__0__0_"> Equals(T, T)</h3>
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<p>Determines whether the specified properties are equal.</p>
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<pre><code class="lang-csharp">public bool Equals(T x, T y)
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</code></pre>
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<h4 id="parameters-1">Parameters</h4>
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<p><code>x</code> T</p>
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<p>The first object of type <code class="typeparamref">T</code> to compare.</p>
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<p><code>y</code> T</p>
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<p>The second object of type <code class="typeparamref">T</code> to compare.</p>
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<h4 id="returns">Returns</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a></p>
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<p><a href="https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/bool">true</a> if the specified objects are equal; otherwise,
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<a href="https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/bool">false</a>.</p>
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<h3 id="CapyKit_PropertyComparer_2_GetHashCode__0_"> GetHashCode(T)</h3>
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<p>Returns a hash code for the specified object.</p>
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<pre><code class="lang-csharp">public int GetHashCode(T obj)
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</code></pre>
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<h4 id="parameters-2">Parameters</h4>
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<p><code>obj</code> T</p>
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<p>The <span class="xref">System.Object</span> for which a hash code is to be returned.</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.int32">int</a></p>
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<p>A hash code for the specified object.</p>
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<h4 id="exceptions">Exceptions</h4>
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<p><a href="https://learn.microsoft.com/dotnet/api/system.argumentnullexception">ArgumentNullException</a></p>
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<p>The type of <code class="paramref">obj</code> is a reference type and
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<code class="paramref">obj</code> is
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<a href="https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null">null</a>.</p>
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