Example of IComparable and IComparer

IComparable

        class CheckCompare:IComparable<CheckCompare>

        {

            public int A = 0;

            public int B = 0;

            public int C = 0;

            public int Total

            {

                get

                {

                    return this.A + this.B + this.C;

                }

            }

            public int CompareTo(CheckCompare other)

            {

                if (this.Total > other.Total)

                    return 1;

                else if (this.Total < other.Total)

                    return -1;

                else

                    return 0;

            }

        }

       

        static void Main(string[] args)

        {

            List<CheckCompare> ccl = new List<CheckCompare>();

            for (int ii = 3; ii > 0;ii--)

            {

                CheckCompare cc = new CheckCompare() { A = ii, B = ii + 2, C = ii + 8 };

                ccl.Add(cc);

            }

            ccl.Sort();

            foreach (CheckCompare cz in ccl)

                Console.WriteLine(cz.Total);

IComparer

        public class CheckCompareAComparer : IComparer<CheckCompare>

        {

            public int Compare(CheckCompare x, CheckCompare y)

            {

                if (x.Total > y.Total)

                    return 1;

                else if (x.Total < y.Total)

                    return -1;

                else

                    return 0;

            }

        }

        static void Main(string[] args)

        {

           

            List<CheckCompare> ccl = new List<CheckCompare>();

            for (int ii = 3; ii > 0;ii--)

            {

                CheckCompare cc = new CheckCompare() { A = ii, B = ii + 2, C = ii + 8 };

                ccl.Add(cc);

            }

            ccl.Sort(new CheckCompareAComparer());

            foreach (CheckCompare cz in ccl)

                Console.WriteLine(cz.Total);