using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections; namespace Hashtable_test { class Program { static void Main() { Hashtable Ht = new Hashtable(); //创建一个Hashtable实例 Ht.Add("E", "e"); //添加key/value键值对 Ht.Add("A","a"); Ht.Add("C","c"); Ht.Add("B", "b"); string s = (string)Ht["A"]; if (Ht.Contains("E")) { //判断哈希表是否包含特定键,返回值为true或false Console.WriteLine("the E key:Exist"); } Ht.Remove("C"); //移除一个key/value键值对 Console.WriteLine(Ht["A"]);//此处输出a Ht.Clear(); //移除所有元素 Console.WriteLine(Ht["A"]); //此处将不会有任何输出 } } }