Структура описывающая уникальную связь.

Link

using System;

namespace Links.Core.Structures
{
    /// <summary>
    /// Структура описывающая уникальную связь.
    /// </summary>
    public struct Link : IEquatable<Link>
    {
        public readonly Unique Id;
        public readonly Pair Pair;

        public Link(Unique id, Pair pair)
        {
            Id = id;
            Pair = pair;
        }

        static public Link Create(Unique id, Pair pair)
        {
            return new Link(id, pair);
        }

        public override int GetHashCode()
        {
            var hash = 17;
            hash = hash * 31 + Id.GetHashCode();
            hash = hash * 31 + Pair.GetHashCode();
            return hash;
        }

        public override bool Equals(object other)
        {
            return other is Link && Equals((Link)other);
        }

        public bool Equals(Link other)
        {
            return Id.Equals(other.Id) &&
                   Pair.Equals(other.Pair);
        }
    }
}