GetHashCode 및 HashTable, Dictionary

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Text.RegularExpressions;

using System.IO;

using System.Collections;

using Data = System.Data.SqlClient;



namespace COL_TEST

{

    class Program

    {

        static void Main(string[] args)

        {

            //  GetHashCode  

            //Console.WriteLine(ht.GetHashCode());

            //Console.WriteLine(ht.GetHashCode());



            A a = new A(2, 2);

            A aa = new A(1, 4);

            A bb = new A(1, 3);

            Dictionary<A, int> hs = new Dictionary<A, int>();

            hs.Add(a, 2);

            hs.Add(aa, 2);

            hs.Add(bb, 2);



            foreach (KeyValuePair<A, int> p in hs)

            {

                Console.WriteLine("Key: " + p.Key + "   Value: " + p.Value);

                Console.WriteLine("hashCode:{0}", p.Key.GetHashCode());

            }



            Console.WriteLine("-----------------");

            /***************/

            Hashtable hht = new Hashtable();

            Class3 cc = new Class3(2, 3);

            Class3 cc2 = new Class3(1, 4);

            Class3 cc3 = new Class3(3, 3);

            hht.Add(cc, "test1");

            hht.Add(cc2, "test2");

            hht.Add(cc3, "test3");

            //cc.x = 5;  // cc , cc 

            foreach (var item in hht.Keys)

            {

                Console.WriteLine(item.ToString());

                Console.WriteLine(hht[item]);

            }

            Console.Read(); 



            // hashTable , GetHashCode , toString  

            //

        }

    }



    public struct MyStruct

    {



        public int _sx;

        public string _msg;



        public int _id;



        public DateTime _epoch;



    }







    class A

    {

        int i, j;

        public A(int i, int j)

        {

            this.i = i;

            this.j = j;

        }



        public override Int32 GetHashCode()

        {

            return i * j;

        }

        public override string ToString()

        {

            return String.Format("({0},{1})", i, j);

        }

    }

    class Class3

    {

        public int x;

        int y;

        public Class3(int x, int y)

        {

            this.x = x;

            this.y = y;

        }

        public override int GetHashCode()

        {

            Console.WriteLine(" hashcode");

            return x + y;

        }

        public override bool Equals(object obj)

        {

            Console.WriteLine(" equals");

            return base.Equals(obj);

        }

        public override string ToString()

        {

            return x.ToString() + y.ToString();

        }

    }  



}