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；

 1  static void Main(string[] args)
 2         {
 3             //创建几个学员对象
 4             Student objStudent1 = new Student(1001, "小明");
 5             Student objStudent2 = new Student(1002, "小王");
 6             Student objStudent3 = new Student(1003, "小林");
 7             Student objStudent4 = new Student(1004, "小周");
 8             Student objStudent5 = new Student(1005, "小郭");
 9
10             //创建集合对象
11             List<Student> objStuList = new List<Student>();
12             objStuList.Add(objStudent1);
13             objStuList.Add(objStudent2);
14             objStuList.Add(objStudent3);
15             objStuList.Add(objStudent4);
16            //创建Dictionary泛型集合
17            Dictionary<string,Student > objDicStuList= new Dictionary<string, Student>();
18             objDicStuList.Add("林", objStudent3);
19             objDicStuList.Add("王", objStudent2);
20             objDicStuList.Add("周", objStudent4);
21             objDicStuList.Add("郭", objStudent5);
22
23             //通过键值来直接显示值，查询
24             Console.WriteLine(objDicStuList["王"].StudentName);
25
26             //遍历key值
27             foreach (var item in objDicStuList.Keys)
28             {
29                 Console.WriteLine(item);
30             }
31             Console.WriteLine("---------");
32             //遍历 value
33             foreach (var item in objDicStuList.Values)
34             {
35                 Console.WriteLine(item.StudentId+"\t"+item.StudentName);
36             }
37             Console.ReadLine();
38         }