private void Form1_Load(object sender, EventArgs e)

        {

            Hashtable ht = new Hashtable();

            ht.Add("job", "a");

            ht.Add("jobmon", "");

            //单个取值，方法比较特别

            string a = ht["jobmon"].ToString();

            //Console.WriteLine(a);

            //第一种方法遍历

            foreach(DictionaryEntry de in ht)

            {

                Console.WriteLine(de.Key);

                Console.WriteLine(de.Value);

            }

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

            //第二种方法遍历

            IDictionaryEnumerator enumerator = ht.GetEnumerator();

            while (enumerator.MoveNext())

            {

                Console.WriteLine(enumerator.Key);

                Console.WriteLine(enumerator.Value);

            }

            Console.WriteLine("++++++++++++++++++++++++++");

            //hashtable的排序第一种方法，按照键的大小排序

            ArrayList al = new ArrayList(ht.Keys);

            al.Sort();

            al.Reverse(); //反向排序

            foreach (string str in al)

            {

                Console.WriteLine(str + "  " + ht[str]);

            }

            Console.WriteLine("++++++++++++++++++++++++++");

            //hashtable的排序第二种方法，按照值的大小排序

            ArrayList alv = new ArrayList(ht.Values);

            alv.Sort();

            foreach (string str in alv)

            {

                IDictionaryEnumerator enumerator2 = sl.GetEnumerator();

                while (enumerator2.MoveNext())

                {

                    if (str.Equals(enumerator2.Value.ToString()))

                    {

                        Console.WriteLine(enumerator2.Key + ":" + enumerator2.Value);

                    }

                }

            }

            Console.WriteLine("++++++++++++++++++++++++++");

            //hashtable的排序第三种方法，用SortedList代替hashtable

            SortedList sl = new SortedList();

            sl.Add("a", "a1");

            sl.Add("c", "c1");

            sl.Add("b", "b1");

            IDictionaryEnumerator enumerator1 = sl.GetEnumerator();

            while (enumerator1.MoveNext())

            {

                Console.WriteLine(enumerator1.Key);

                Console.WriteLine(enumerator1.Value);

            }

        }