C#中的Dictionary的使用

在工作中有时候会用到Dictionary，由于自己之前没用过，参考了一下前人和先辈的实践，仿照着写了一个Test，第一次用还不是很熟练，要多实践练习才能用的得心应手，写代码重在敲键盘，以此为诫。（主要注意下这个Dictionary的key和value以及添加数据方式）

写了三个方法和一个Student类。

 1 namespace DictionaryTest
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             DicSample1();
 8             DicSample2();
 9             DicSample3();
10             Console.ReadLine();
11         }
12
13         public static void DicSample1()
14         {
15             Dictionary<string, string> dic = new Dictionary<string, string>();
16             if (dic.ContainsKey("Item1") == false)
17             {
18                 dic.Add("Item1", "ZheJiang");
19             }
20             if (dic.ContainsKey("Item2") == false)
21             {
22                 dic.Add("Item2", "ShangHai");
23             }
24             else
25             {
26                 dic["Item2"] = "ShangHai";
27             }
28             if (dic.ContainsKey("Item3") == false)
29             {
30                 dic.Add("Item3", "BeiJing");
31             }
32             if (dic.ContainsKey("Item1"))
33             {
34                 Console.WriteLine("Output:" + dic["Item1"]);
35             }
36             //遍历key
37             foreach (var key in dic.Keys)
38             {
39                 Console.WriteLine("Output key :{0}" , dic.Keys);
40             }
41             //遍历value
42             foreach (var value in dic.Values)
43             {
44                 Console.WriteLine("Output value :{0}", dic.Values);
45             }
46
47             foreach (var d in dic)
48             {
49                 Console.WriteLine("Output key:{0}, value:{1}", d.Key, d.Value);
50             }
51         }
52
53         public static void DicSample2()
54         {
55             Dictionary<string, string[]> dics = new Dictionary<string, string[]>();
56             string[] ZheJiang = { "Hangzhou", "Huzhou", "Taizhou", "Wenzhou", "Quzhou" };
57             string[] AnHui = { "Hefei", "Wuhu", "Huainan", "Fuyang", "Huangshan" };
58             dics.Add("ZJ", ZheJiang);
59             dics.Add("AH", AnHui);
60             for (int i = 0; i <= ZheJiang.Count() - 1; i++)
61             { Console.WriteLine("Output:" + dics["ZJ"][i]); }
62             for (int j = 0; j < AnHui.Count() - 1; j++)
63             { Console.WriteLine("Output:" + dics["AH"][j]); }
64         }
65
66         public static void DicSample3()
67         {
68             Dictionary<string, Student> dics = new Dictionary<string, Student>();
69             Student student = null;
70             for (int i = 0; i < 3; i++)
71             {
72                 student = new Student();
73                 student.Num = i.ToString();
74                 student.Name = "Student Name" + i.ToString();
75                 dics.Add(i.ToString(), student);
76             }
77             foreach (var stuItem in dics)
78             {
79                 Console.WriteLine("Output: key{0},Num{1},Name{2}", stuItem.Key, stuItem.Value.Num, stuItem.Value.Name);
80             }
81         }
82     }
83     public class Student
84     {
85         public string Name { get; set; }
86         public string Num { get; set; }
87     }
88 }

以下是运行结果：