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347 lines
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<title>Class PropertyComparer<T, U> | CapyKit Documentation </title>
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<meta name="description" content="A object comparer that can accept a lambda expression to compare properties.">
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<article data-uid="CapyKit.PropertyComparer`2">
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<h1 id="CapyKit_PropertyComparer_2" data-uid="CapyKit.PropertyComparer`2" class="text-break">
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Class PropertyComparer<T, U>
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</h1>
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<div class="facts text-secondary">
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<dl><dt>Namespace</dt><dd><a class="xref" href="CapyKit.html">CapyKit</a></dd></dl>
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<dl><dt>Assembly</dt><dd>CapyKit.dll</dd></dl>
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</div>
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<div class="markdown summary"><p>A object comparer that can accept a lambda expression to compare properties.</p>
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</div>
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<div class="markdown conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public class PropertyComparer<T, U> : IEqualityComparer<T></code></pre>
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</div>
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<h4 class="section">Type Parameters</h4>
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<dl class="parameters">
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<dt><code>T</code></dt>
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<dd><p>Generic type parameter of the parent object.</p>
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</dd>
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<dt><code>U</code></dt>
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<dd><p>Generic type parameter of the property value.</p>
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</dd>
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</dl>
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<dl class="typelist inheritance">
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<dt>Inheritance</dt>
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<dd>
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<div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></div>
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<div><span class="xref">PropertyComparer<T, U></span></div>
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</dd>
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</dl>
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<dl class="typelist implements">
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<dt>Implements</dt>
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<dd>
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<div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.iequalitycomparer-1">IEqualityComparer</a><T></div>
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</dd>
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</dl>
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<dl class="typelist inheritedMembers">
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<dt>Inherited Members</dt>
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<dd>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object)">object.Equals(object)</a>
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</div>
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<div>
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<a class="xref" 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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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.gethashcode">object.GetHashCode()</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.gettype">object.GetType()</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone">object.MemberwiseClone()</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.referenceequals">object.ReferenceEquals(object, object)</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.tostring">object.ToString()</a>
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</div>
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</dd></dl>
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<dl class="typelist extensionMethods">
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<dt>Extension Methods</dt>
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<dd>
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<div>
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<a class="xref" href="CapyKit.Extensions.ObjectExtensions.html#CapyKit_Extensions_ObjectExtensions_UpdateProperties__1___0___0_">ObjectExtensions.UpdateProperties<T>(T, T)</a>
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</div>
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<div>
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<a class="xref" href="CapyKit.Extensions.ObjectExtensions.html#CapyKit_Extensions_ObjectExtensions_UpdateProperties_System_Object_System_Object_">ObjectExtensions.UpdateProperties(object, object)</a>
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</div>
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</dd></dl>
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<h2 id="CapyKit_PropertyComparer_2_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 class="section" id="constructors">Constructors
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</h2>
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<a id="CapyKit_PropertyComparer_2__ctor_" data-uid="CapyKit.PropertyComparer`2.#ctor*"></a>
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<h3 id="CapyKit_PropertyComparer_2__ctor_System_Func__0__1__" data-uid="CapyKit.PropertyComparer`2.#ctor(System.Func{`0,`1})">
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PropertyComparer(Func<T, U>)
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</h3>
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<div class="markdown level1 summary"><p>Constructor.</p>
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</div>
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<div class="markdown level1 conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public PropertyComparer(Func<T, U> expression)</code></pre>
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</div>
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<h4 class="section">Parameters</h4>
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<dl class="parameters">
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<dt><code>expression</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.func-2">Func</a><T, U></dt>
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<dd><p>The expression.</p>
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</dd>
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</dl>
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<h2 class="section" id="methods">Methods
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</h2>
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<a id="CapyKit_PropertyComparer_2_Equals_" data-uid="CapyKit.PropertyComparer`2.Equals*"></a>
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<h3 id="CapyKit_PropertyComparer_2_Equals__0__0_" data-uid="CapyKit.PropertyComparer`2.Equals(`0,`0)">
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Equals(T, T)
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</h3>
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<div class="markdown level1 summary"><p>Determines whether the specified properties are equal.</p>
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</div>
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<div class="markdown level1 conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public bool Equals(T x, T y)</code></pre>
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</div>
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<h4 class="section">Parameters</h4>
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<dl class="parameters">
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<dt><code>x</code> <span class="xref">T</span></dt>
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<dd><p>The first object of type <code class="typeparamref">T</code> to compare.</p>
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</dd>
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<dt><code>y</code> <span class="xref">T</span></dt>
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<dd><p>The second object of type <code class="typeparamref">T</code> to compare.</p>
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</dd>
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</dl>
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<h4 class="section">Returns</h4>
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<dl class="parameters">
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<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a></dt>
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<dd><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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</dd>
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</dl>
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<a id="CapyKit_PropertyComparer_2_GetHashCode_" data-uid="CapyKit.PropertyComparer`2.GetHashCode*"></a>
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<h3 id="CapyKit_PropertyComparer_2_GetHashCode__0_" data-uid="CapyKit.PropertyComparer`2.GetHashCode(`0)">
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GetHashCode(T)
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</h3>
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<div class="markdown level1 summary"><p>Returns a hash code for the specified object.</p>
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</div>
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<div class="markdown level1 conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public int GetHashCode(T obj)</code></pre>
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</div>
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<h4 class="section">Parameters</h4>
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<dl class="parameters">
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<dt><code>obj</code> <span class="xref">T</span></dt>
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<dd><p>The <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a> for which a hash code is to be returned.</p>
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</dd>
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</dl>
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<h4 class="section">Returns</h4>
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<dl class="parameters">
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<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></dt>
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<dd><p>A hash code for the specified object.</p>
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</dd>
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</dl>
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<h4 class="section">Exceptions</h4>
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<dl class="parameters">
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<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.argumentnullexception">ArgumentNullException</a></dt>
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<dd><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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</dd>
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</dl>
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</article>
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