1.初始化一个键值对

1  //初始化定义一个键值对，注意最后的括号
2  Dictionary<int, string> dic = new Dictionary<int, string>();

 2.为键值对添加元素

1 //键值对的Add函数
2 dic.Add(2, "zhao");
3 dic.Add(4, "qian");
4 dic.Add(6, "sun");
5 dic.Add(8, "li");

3.键值对的ContainsKey和ContainsValue函数

1 //键值对的ContainsKey和ContainsValue函数
2 Console.WriteLine(dic[4]);
3 Console.WriteLine("键值对是否包含键2：" + dic.ContainsKey(2));
4 Console.WriteLine("键值对是否包含键5：" + dic.ContainsKey(5));
5 Console.WriteLine("键值对是否包含值zhao：" + dic.ContainsValue("zhao"));
6 Console.WriteLine("键值对是否包含值Zhao：" + dic.ContainsValue("Zhao"));

 4.键值对的数量

1 //键值对的数量
2 Console.WriteLine("键值对包含键值数量：" + dic.Count);

5.键值对的keys属性

1 //键值对的keys属性
2 foreach (int item in dic.Keys)
3 {
4     Console.WriteLine("键为：{0}，值为：{1}", item, dic[item]);
5 }

 6.对键值对进行遍历

1 //对键值对进行遍历
2 foreach (KeyValuePair<int,string> kv in dic)
3 {
4     Console.WriteLine("键为：{0}，值为：{1}", kv.Key, kv.Value);
5 }

 

using System;
using System.Collections.Generic;
namespace _09键值对
{class Program{static void Main(string[] args){//Dictionary//定义一个键值对集合Dictionary<string, string> dictionary = new Dictionary<string, string>();//添加键值对数据,键必须唯一,值可重复dictionary.Add("1", "张珊");dictionary.Add("2", "李四");dictionary.Add("3", "王五");dictionary.Add("4", "王八");//重赋值dictionary["3"] = "沈继涵";//判断集合中是否含有某一个键ContainsKey()if (!dictionary.ContainsKey("5")){dictionary.Add("5", "杨过");//不含则加}else{dictionary["5"] = "杨过";//含则改}Console.WriteLine(dictionary["5"]);//用foreach//通过键遍历集合foreach (string item in dictionary.Keys){Console.WriteLine("键--{0}   值--{1}", item, dictionary[item]);}//通过键值对遍历集合foreach (KeyValuePair<string, string> kv in dictionary){Console.WriteLine("键--{0}   值--{1}", kv.Key, kv.Value);}Console.ReadKey();}}
}