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();

       }
}