hashtable的简单应用

       Hashtable ht = new Hashtable();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ht.Add("北京", "010");
            ht.Add("上海", "021");
            ht.Add("广州", "020");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            foreach (DictionaryEntry a in ht)
            {
                string msg = "Key=" + a.Key.ToString() + " Value=" + a.Value.ToString();

                this.listBox1.Items.Add(msg);
            }
        }