using System.Collections; static void Main(string[] args) { TestHashtable(); } //------------------------------------------------------ // 哈希表(Hashtable) public static void TestHashtable() { Hashtable ht = new Hashtable(); ht.Add("001", "a"); ht.Add("002", "b"); ht.Add("003", "c"); if (ht.ContainsValue("a")) { Console.WriteLine("存在"); } else { ht.Add("004", "c"); } // 获取键的集合 ICollection key = ht.Keys; foreach (string k in key) { Console.WriteLine(k + ": " + ht[k]); } Console.ReadLine(); } //------------------------------------------------------