C#的Dictionary字典，

C#的Dictionary字典，
Dictionary

Dictionary可以取代Hashtable了;
有一種新的遍曆方式

foreach(KeyValuePair <int,string> kv in dic){}

dictionary練習

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Dictionary字典{    class Program    {        static void Main(string[] args)        {            Dictionary<int, string> dic = new Dictionary<int, string>();            dic.Add(1, "荊軻");            dic.Add(2, "聶政");            dic.Add(3, "專諸");            dic.Add(4, "要離");            foreach (int item in dic.Keys)            {                Console.WriteLine("{0}對應的值為{1}",item,dic[item]);            }            foreach(KeyValuePair<int,string> pair in dic)            {                Console.WriteLine("{0}對應的值為{1}",pair.Key,pair.Value);            }            Console.ReadKey();        }    }}

用Dictionary檢測字元出現次數

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Dictionary檢測字母出現次數{    class Program    {        static void Main(string[] args)        {            //檢測字串"Welcome To China"裡面每個字元出現的次數;            Dictionary<char, int> dic = new Dictionary<char, int>();            string str = "Welcome To China";            for (int i = 0; i < str.Length; i++)            {                if (str[i]==' ')                {                    continue;                }                if (dic.ContainsKey((str.ToLower())[i]))                {                    dic[(str.ToLower())[i]]++;                }                else                {                    dic[(str.ToLower())[i]] = 1;                }            }            foreach (KeyValuePair<char,int> item in dic)            {                Console.WriteLine("{0}出現過{1}次",item.Key,item.Value);            }            Console.ReadKey();        }    }}