class Program { static void Main(string[] args) { Dictionary<string, string> dict = new Dictionary<string, string>(); dict.Add("one", "hello"); dict.Add("two", "world"); dict.Add("three", "gogo"); //判断字典的key是否存在 if (dict.ContainsKey("two")) { //根据键值取值 Console.WriteLine(dict["two"]); } //输出字典的长度 Console.WriteLine(dict.Count); //遍历字典 foreach (var i in dict) { Console.WriteLine(i.Key + ":" + i.Value); } Console.ReadKey(); } }