C#中的Dictionary字典类常用方法介绍

 using System.Collections.Generic;//引用命名空间//Dictionary可以理解为散列集合
 public class DictionaryTest
 {
          public static void Main()
          {
                //1.初始化
                Dictionary<string, string> dicA = new Dictionary<string, string>();
                //2.添加元素 key，value->学号，姓名
                dicA.Add("A01", "张三");
                dicA.Add("A02", "李四");
                dicA.Add("B03", "王五");
                dicA.Add("A03", "毛毛");
                dicA.Add("B02", "张三");

                //3.通过key删除元素
                dicA.Remove("A03");
                //4.修改值
                dicA("A02")="新值";

                //5.假如不存在元素则加入元素
                if (! dicA.ContainsKey("A08"))
                    dicA.Add("A08", "哈哈");

                //6.获取元素个数
                int count= dicA.Count;

                //7.遍历集合
                foreach (KeyValuePair<string, string> kvp in dicA)
                {
                       Console.WriteLine("学号：{0},姓名：{1}", kvp.Key, kvp.Value);
                }

               //8.遍历键或值的集合
               Dictionary<string, string>.KeyCollection allKeys = dicA.Keys;
               Console.WriteLine("最佳女主角：");
               foreach (string oneKey in allKeys)
               {
                    Console.WriteLine(oneKey);
               }

               //Dictionary<string, string>.ValueCollection allValues = dicA.Values;
               //foreach (string oneValue in allValues)
               //{
               //     Console.WriteLine(oneValue);
               //}

               //9.取值
               string stuName=dicA("A01");

               //10.清空
               dicA.Clear();

        }