DynamicEqualityComparer Class

Definition

Namespace

Cuemon.Collections.Generic

Assemblies

Cuemon.Core.dll

Source

src/Cuemon.Core/Collections/Generic/DynamicEqualityComparer.cs

Provides a factory based way to create and wrap an IEqualityComparer<T> implementation.

public static class DynamicEqualityComparer

Inheritance

object

DynamicEqualityComparer

Examples

The following example shows how to create a case-insensitive IEqualityComparer<string> using DynamicEqualityComparer with lambda expressions. It filters distinct values from a mixed-case word list and prints the result.

using System;
using System.Collections.Generic;
using System.Linq;
using Cuemon.Collections.Generic;

namespace MyApp.Examples;

public static class DynamicEqualityComparerExample
{
    public static void Demonstrate()
    {
        string[] words = ["Hello", "world", "hello", "World", "HELLO"];

        // Create a case-insensitive equality comparer for strings
        IEqualityComparer<string> caseInsensitive = DynamicEqualityComparer.Create<string>(
            hashCalculator: s => StringComparer.OrdinalIgnoreCase.GetHashCode(s),
            equalityComparer: (x, y) => string.Equals(x, y, StringComparison.OrdinalIgnoreCase));

        string[] distinct = words.Distinct(caseInsensitive).ToArray();
        Console.WriteLine(string.Join(", ", distinct));
    }
}

Methods

Name	Description
Create<T>(Func<T, int>, Func<T, T, bool>)	Creates a dynamic instance of an IEqualityComparer<T> implementation wrapping GetHashCode(T) through hashCalculator and Equals(T, T). through equalityComparer.