c#字典

   static void Main(string[] args)
        {
            //字典有两个属性 key和value，
            //字典的好处是查找速度比list快
            //


            //首先定义一个key为int 值为string的字典
            Dictionary<int, string> dictionary = new Dictionary<int, string>();
            
            dictionary.Add(1, "123");
            dictionary.Add(2, "234");
            dictionary.Add(3, "345");

          
            Dictionary<int, Dictionary<int, string>> dic = new Dictionary<int, Dictionary<int, string>>();
            //初始化
            dic.Add(1, dictionary);

            //查找
            Console.WriteLine("请输入你要查找字典的ID");
            int i = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("请输入你要查找数据的ID");
            int index = Convert.ToInt32(Console.ReadLine());

            if (dic.ContainsKey(i))
            {
                if(dictionary.ContainsKey(index))
                {
               //     string str = dic[i][index];
                    Console.WriteLine("查找成功，值为{0}:", dic[i][index]);
                }
                else
                {
                    Console.WriteLine("对不起，没有这个ID");
                }
            }
            else
            {
                Console.WriteLine("对不起，没有这个ID");
            }

        }