C#中的Dictionary相关方法

C#中的Dictionary即类似于泛型哈希表，具有与哈希表类似的增删改查与遍历操作。

using System; 
using System.Collections.Generic;

namespace lesson08
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<int,string> dictionary = new Dictionary<int,string>();
            #region 增删查改
            //增加
            dictionary.Add(1, "ab");
            dictionary.Add(2, "cd");
            dictionary.Add(3, "ef");
            //删除
            dictionary.Remove(2);
            dictionary.Clear();

            Console.WriteLine("*************************");
            dictionary.Add(1, "ab");
            dictionary.Add(2, "cd");
            dictionary.Add(3, "ef");

            //查找
            Console.WriteLine(dictionary[1]);
            Console.WriteLine(dictionary.ContainsKey(2));
            Console.WriteLine(dictionary.ContainsValue("ef"));

            //修改
            dictionary[2] = "ggg";
            Console.WriteLine(dictionary[2]);
            #endregion
            #region 遍历
            Console.WriteLine("*************************");
            Console.WriteLine(dictionary.Count);
            Console.WriteLine("*************************");
            foreach (int item in dictionary.Keys)
            {
                Console.WriteLine(item);
                Console.WriteLine(dictionary[item]);
            }
            Console.WriteLine("*************************");
            foreach (string item in dictionary.Values)
            {
                Console.WriteLine(item);
            }
            Console.WriteLine("*************************");
            foreach (KeyValuePair<int, string> item in dictionary) 
            {
                Console.WriteLine("键：" + item.Key + "值：" + item.Value);
            }
            #endregion
        }
    }
}