C#中的Dictionary的使用

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。

 namespace DictionaryTest

 {

     class Program

     {

         static void Main(string[] args)

         {

             DicSample1();

             DicSample2();

             DicSample3();

             Console.ReadLine();

         }

         public static void DicSample1()

         {

             Dictionary<string, string> dic = new Dictionary<string, string>();

             if (dic.ContainsKey("Item1") == false)

             {

                 dic.Add("Item1", "ZheJiang");

             }

             if (dic.ContainsKey("Item2") == false)

             {

                 dic.Add("Item2", "ShangHai");

             }

             else

             {

                 dic["Item2"] = "ShangHai";

             }

             if (dic.ContainsKey("Item3") == false)

             {

                 dic.Add("Item3", "BeiJing");

             }

             if (dic.ContainsKey("Item1"))

             {

                 Console.WriteLine("Output:" + dic["Item1"]);

             }

             //遍历key

             foreach (var key in dic.Keys)

             {

                 Console.WriteLine("Output key :{0}" , dic.Keys);

             }

             //遍历value

             foreach (var value in dic.Values)

             {

                 Console.WriteLine("Output value :{0}", dic.Values);

             }

             foreach (var d in dic)

             {

                 Console.WriteLine("Output key:{0}, value:{1}", d.Key, d.Value);

             }

         }

         public static void DicSample2()

         {

             Dictionary<string, string[]> dics = new Dictionary<string, string[]>();

             string[] ZheJiang = { "Hangzhou", "Huzhou", "Taizhou", "Wenzhou", "Quzhou" };

             string[] AnHui = { "Hefei", "Wuhu", "Huainan", "Fuyang", "Huangshan" };

             dics.Add("ZJ", ZheJiang);

             dics.Add("AH", AnHui);

             for (int i = ; i <= ZheJiang.Count() - ; i++)

             { Console.WriteLine("Output:" + dics["ZJ"][i]); }

             for (int j = ; j < AnHui.Count() - ; j++)

             { Console.WriteLine("Output:" + dics["AH"][j]); }

         }

         public static void DicSample3()

         {

             Dictionary<string, Student> dics = new Dictionary<string, Student>();

             Student student = null;

             for (int i = ; i < ; i++)

             {

                 student = new Student();

                 student.Num = i.ToString();

                 student.Name = "Student Name" + i.ToString();

                 dics.Add(i.ToString(), student);

             }

             foreach (var stuItem in dics)

             {

                 Console.WriteLine("Output: key{0},Num{1},Name{2}", stuItem.Key, stuItem.Value.Num, stuItem.Value.Name);

             }

         }

     }

     public class Student

     {

         public string Name { get; set; }

         public string Num { get; set; }

     }

 }

以下是运行结果：