C# Dictionary

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 字典
{
    class Program
    {
        static void Main(string[] args)
        {
            //Hashtable 键值对集合
            Dictionary<int, string> dic = new Dictionary<int, string>();
            dic.Add(1, "123");
            dic.Add(2, "456");
            dic.Add(3, "789");
            //通过索引赋值，会覆盖原有值
            dic[1] = "111";

            //两种遍历的方式
            foreach (KeyValuePair<int, string> kv in dic)
            {
                Console.WriteLine("{0}------{1}", kv.Key, kv.Value);
            }

            foreach (var item in dic.Keys)
            {
                Console.WriteLine("{0}----------{1}", item, dic[item]);

            }
            Console.ReadKey();
        }
    }
}