子类HashSet，以便在另一个集合中使用时始终使用某个IEqualityComparer [英] Subclass HashSet so that it always uses a certain IEqualityComparer when used in another set

问题描述

我想对HashSet<Point>进行子类化，以便每当在另一个集合中使用它时，都将HashSet<Point>.CreateSetComparer()用作IEqualityComparer.

基本上每次我这样做:

var myDict = new Dictionary<MySubclassOfHashSet, Char>();

我希望它被自动视为:

var myDict = new Dictionary<HashSet<Point>, Char>(HashSet<Point>.CreateSetComparer());

根据此问题.

我目前手动执行以下操作:

class MySubclassOfHashSet: HashSet<Point> {
    public override bool Equals(object obj) {
      //...
    }
    public override int GetHashCode() {
      //...
    }
}

但这有点丑陋.有什么更简单的方法让我丢失吗?

解决方案

    var myDict = new Dictionary<MySubclassOfHashSet<Point>, Char>();

    public sealed class MySubclassOfHashSet<T> : HashSet<T>, IEquatable<MySubclassOfHashSet<T>>
    {
        public override int GetHashCode()
        {
            return Unique.GetHashCode(this);
        }
        public bool Equals(MySubclassOfHashSet<T> other)
        {
            return Unique.Equals(this, other);
        }

        private static readonly IEqualityComparer<HashSet<T>> Unique = HashSet<T>.CreateSetComparer();
    }

I want to subclass HashSet<Point> so that it uses HashSet<Point>.CreateSetComparer() as an IEqualityComparer whenever I use it inside another set.

Basically every time I do this:

var myDict = new Dictionary<MySubclassOfHashSet, Char>();

I want it automatically treated as :

var myDict = new Dictionary<HashSet<Point>, Char>(HashSet<Point>.CreateSetComparer());

As per this question.

I have currently done this manually as follows:

class MySubclassOfHashSet: HashSet<Point> {
    public override bool Equals(object obj) {
      //...
    }
    public override int GetHashCode() {
      //...
    }
}

But it's kind of ugly. Is there an easier way that I'm missing?

解决方案

    var myDict = new Dictionary<MySubclassOfHashSet<Point>, Char>();

    public sealed class MySubclassOfHashSet<T> : HashSet<T>, IEquatable<MySubclassOfHashSet<T>>
    {
        public override int GetHashCode()
        {
            return Unique.GetHashCode(this);
        }
        public bool Equals(MySubclassOfHashSet<T> other)
        {
            return Unique.Equals(this, other);
        }

        private static readonly IEqualityComparer<HashSet<T>> Unique = HashSet<T>.CreateSetComparer();
    }

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