using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<faceline> Faceline = new List<faceline>();

        Faceline.Add(new faceline{a = 1, b = 2});

        Faceline.Add(new faceline{a = 2, b = 1});

        Faceline.Add(new faceline{a = 1, b = 1});

        Faceline = Faceline.Distinct().ToList();

        for (int i = 0; i < Faceline.Count(); i++)

        {

            Console.WriteLine("a: {0} b: {1}", Faceline[i].a, Faceline[i].b);

        }

    }

​

    public class faceline

    {

        public int a

        {

            get;

            set;

        }

​

        public int b

        {

            get;

            set;

        }

​

        public override bool Equals(object obj)

        {

            if (obj != null && obj is faceline)

            {

                bool aEqalsa = ((faceline)obj).a == this.a && ((faceline)obj).b == this.b;

                bool bEqalsa = ((faceline)obj).b == this.a && ((faceline)obj).a == this.b;

                return aEqalsa || bEqalsa;

            }

​

            return false;

        }

​

        public override int GetHashCode()

        {

            return a.GetHashCode() + b.GetHashCode();

        }

    }

}