C#高級------数据字典练习

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

namespace out_ref
{
    class Program
    {
        static void Main(string[] args)
        {
           //把123替换为一二三
            string str = "1一 2二 3三";
            string[]strs = str.Split(new char[] { ‘ ‘ }, StringSplitOptions.RemoveEmptyEntries);
            Dictionary<char, char> dic = new Dictionary<char, char>();
            for (int i = 0; i < strs.Length; i++)
            {
                if (!dic.ContainsKey(strs[i][0]))
                {
                    dic.Add(strs[i][0],strs[i][1]);
                }
            }

            string res = null;
            Console.WriteLine("请输入一个数字");
            string s = Console.ReadLine();
            for (int i = 0; i < s.Length; i++)
            {
                if (dic.ContainsKey(s[i]))
                {
                    //根据Key获得Value
                    res += dic[s[i]];
                }
                else
                {
                    res += s[i];
                }
            }
            Console.WriteLine(res);
            Console.ReadKey();
        }
    }
}

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

namespace out_ref
{
    class Program
    {
        static void Main(string[] args)
        {
           //计算Welcome , to Chinaworld这个单词中每个字母出现了多少次
            string nums = "Welcome , to Chinaworld";
            Dictionary<char, int> dic = new Dictionary<char, int>();
            for (int i = 0; i < nums.Length; i++)
            {
                if (!dic.ContainsKey(nums[i]))
                {
                    dic.Add(nums[i], 1);
                }
                else
                {
                    //如果包含该字符，则把该字符++
                    dic[nums[i]]++;
                }
            }

            foreach (var item in dic)
            {
                Console.WriteLine("{0}个字母出现了{1}次",item.Key,item.Value);
            }
            Console.ReadKey();
        }
    }
}