using System;

using System.Collections;//使用Hashtable时，必须引入这个命名空间 

namespace ConsoleTest

{

    class HashtableTest

    {

        public static void HashtableTestMain()

        {

            // 创建一个Hashtable实例

            Hashtable ht = new Hashtable();

            // 添加key-value键值对

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

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

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

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

            // 遍历哈希表只能用foreach来遍历,因为Hashtable不能用索引访问

            // 遍历key

            foreach (Object item in ht.Keys)

            {

                Console.WriteLine("Key : {0} ;", (string)item);

            }

            // 遍历value

            foreach (Object item in ht.Values)

            {

                Console.WriteLine("Value : {0} ;", (string)item);

            }

            //遍历

            foreach (DictionaryEntry de in ht)

            {

                Console.WriteLine("Key : {0} ; Value : {1}.", de.Key, de.Value);

            }

            // 哈希表排序

            ArrayList list = new ArrayList(ht.Keys);

            list.Sort();

            foreach (string key in list)

            {

                Console.WriteLine("Key : {0} ; Value : {1}.", key, ht[key]);

            }

            // 赋值

            ht["A"] = "你好";

            // 判断哈希表是否包含特定键,其返回值为true或false

            if (ht.Contains("A"))

            {

                Console.WriteLine("Key : {0} ; Value : {1}.", "A", ht["A"]);

            }

            // 移除一个key-value键值对

            ht.Remove("C");

            // 遍历哈希表

            IDictionaryEnumerator myEnumerator = ht.GetEnumerator();

            while (myEnumerator.MoveNext())

            {

                Console.WriteLine("Key : {0} ; Value : {1}.", myEnumerator.Key, ht[myEnumerator.Key]);

            }

            // 复制

            Hashtable ht2 = ht.Clone() as Hashtable;

            ht2["A"] = "世界";

            ht["B"] = "晚安";

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

            // 将HashTable中键或值列表复制到数组的方法

            String[] myTargetArray = new String[];

            myTargetArray[] = "The";

            myTargetArray[] = "quick";

            myTargetArray[] = "brown";

            myTargetArray[] = "fox";

            myTargetArray[] = "jumped";

            myTargetArray[] = "over";

            myTargetArray[] = "the";

            myTargetArray[] = "lazy";

            myTargetArray[] = "dog";

            ht.Keys.CopyTo(myTargetArray, );  //赋值键到数组中，从第7位起覆盖。

            ht.Values.CopyTo(myTargetArray, );//赋值值到数组中，从第7位起覆盖。

            // 移除所有元素

            ht.Clear();

            Console.ReadKey();

        }

    }

}