C#入门Dictionary<k,v>泛型集合

关于Dictionary<k,v>泛型集合

• Dictionary<k,v>通常成为字典，<k,v>约束集合中元素类型；
• 编译时检查类型约束，无需装箱拆箱操作，与哈希表操作类似；

 static void Main(string[] args)
        {
            //创建几个学员对象
            Student objStudent1 = new Student(1001, "小明");
            Student objStudent2 = new Student(1002, "小王");
            Student objStudent3 = new Student(1003, "小林");
            Student objStudent4 = new Student(1004, "小周");
            Student objStudent5 = new Student(1005, "小郭");

            //创建集合对象
            List<Student> objStuList = new List<Student>();
            objStuList.Add(objStudent1);
            objStuList.Add(objStudent2);
            objStuList.Add(objStudent3);
            objStuList.Add(objStudent4);
           //创建Dictionary泛型集合  
           Dictionary<string,Student > objDicStuList= new Dictionary<string, Student>();
            objDicStuList.Add("林", objStudent3);
            objDicStuList.Add("王", objStudent2);
            objDicStuList.Add("周", objStudent4);
            objDicStuList.Add("郭", objStudent5);

            //通过键值来直接显示值，查询
            Console.WriteLine(objDicStuList["王"].StudentName);

            //遍历key值
            foreach (var item in objDicStuList.Keys)
            {
                Console.WriteLine(item);
            }
            Console.WriteLine("---------");
            //遍历 value
            foreach (var item in objDicStuList.Values)
            {
                Console.WriteLine(item.StudentId+"\t"+item.StudentName);
            }
            Console.ReadLine();
        }