ArrayEqualityComparer_1.cs

using System;
using System.Collections.Generic;

class ArrayEqualityComparer<TElement> : IEqualityComparer<TElement[]>
{
	public static readonly ArrayEqualityComparer<TElement> Default =
		new ArrayEqualityComparer<TElement>(EqualityComparer<TElement>.Default);

	private readonly IEqualityComparer<TElement> elementEqualityComparer;

	public ArrayEqualityComparer(IEqualityComparer<TElement> elementEqualityComparer) =>
		this.elementEqualityComparer = elementEqualityComparer ?? throw new ArgumentNullException(nameof(elementEqualityComparer));

	public Boolean Equals(TElement[] x, TElement[] y)
	{
		if (ReferenceEquals(x, y)) // both null or both referencing the same array object
			return true;
		if (x is null | y is null)
			return false;
		if (x.Length != y.Length)
			return false;
		for (var i = 0; i != x.Length; i++)
			if (!elementEqualityComparer.Equals(x[i], y[i]))
				return false;
		return true;
	}

	public Int32 GetHashCode(TElement[] types)
	{
		var hashCode = 0x51ed270b;
		if (types == null)
			return hashCode;
		for (var i = 0; i != types.Length; i++)
			hashCode = hashCode * -1521134295 + elementEqualityComparer.GetHashCode(types[i]);
		return hashCode;
	}
}