クエリ パラメータ順に依存しない `Uri` 比較子 （と、クエリ値がカンマ区切りのコレクションの場合に、そちらも順序非依存とする為のアイテム比較子) の仮組み

UriComparer.cs

internal sealed class UriComparer : IEqualityComparer<Uri> {
    private readonly IEqualityComparer<KeyValuePair<string, StringValues>> _queryComparer;

    public UriComparer(IEqualityComparer<KeyValuePair<string, StringValues>>? queryComparer = null) {
        _queryComparer = queryComparer ?? EqualityComparer<KeyValuePair<string, StringValues>>.Default;
    }

    public bool Equals(Uri? x, Uri? y) {
        if (x == y) { return true; }
        if (x is null || y is null) { return false; }

        if (Uri.Compare(x, y, UriComponents.HttpRequestUrl ^ UriComponents.Query, UriFormat.UriEscaped, StringComparison.OrdinalIgnoreCase) != 0) { return false; }

        return x.GetQueryStrings().SequenceEqual(y.GetQueryStrings(), _queryComparer);
    }

    public int GetHashCode([DisallowNull] Uri obj) {
        HashCode hash = new();
        hash.Add(obj.GetComponents(UriComponents.HttpRequestUrl ^ UriComponents.Query, UriFormat.UriEscaped));
        foreach (KeyValuePair<string, StringValues> item in obj.GetQueryStrings()) {
            hash.Add(item, _queryComparer);
        }
        return hash.ToHashCode();
    }
}

internal sealed class CommaQueryComparer : IEqualityComparer<KeyValuePair<string, StringValues>> {
    public bool Equals(KeyValuePair<string, StringValues> x, KeyValuePair<string, StringValues> y) {
        if (x.Equals(y)) { return true; }

        if (x.Key != y.Key) { return false; }
        if (x.Value.Count != y.Value.Count) { return false; }

        for (int i = 0; i < x.Value.Count; i++) {
            IEnumerable<string> xSeq = x.Value[i]?.Split(',').Order() ?? Enumerable.Empty<string>();
            IEnumerable<string> ySeq = y.Value[i]?.Split(',').Order() ?? Enumerable.Empty<string>();
            if (!xSeq.SequenceEqual(ySeq)) { return false; }
        }

        return true;
    }

    public int GetHashCode([DisallowNull] KeyValuePair<string, StringValues> obj) {
        HashCode hash = new();
        hash.Add(obj.Key);
        foreach (string? item in obj.Value) {
            hash.Add(item?.Split(',').Order());
        }
        return hash.ToHashCode();
    }
}