1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace Demo1
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             //创建泛型哈希表,Key类型为int,Value类型为string
14             Dictionary<int, string> myDictionary = new Dictionary<int, string>();
15             //1.添加元素
16             myDictionary.Add(1, "a");
17             myDictionary.Add(2, "b");
18             myDictionary.Add(3, "c");
19             //2.删除元素
20             myDictionary.Remove(3);
21             //3.假如不存在元素则添加元素
22             if (!myDictionary.ContainsKey(4))
23             {
24                 myDictionary.Add(4, "d");
25             }
26             //4.显示容量和元素个数
27             Console.WriteLine("元素个数：{0}",myDictionary.Count);
28             //5.通过key查找元素
29             if (myDictionary.ContainsKey(1))
30             {
31                 Console.WriteLine("key:{0},value:{1}","1", myDictionary[1]);
32                 Console.WriteLine(myDictionary[1]);            
33             }
34             //6.通过KeyValuePair遍历元素
35             foreach (KeyValuePair<int,string>kvp in myDictionary)
36             {
37                 Console.WriteLine("key={0},value={1}", kvp.Key, kvp.Value);
38 
39             }
40             //7.得到哈希表键的集合
41             Dictionary<int, string>.KeyCollection keyCol = myDictionary.Keys;
42                 //遍历键的集合
43                 foreach (int n in keyCol)
44                 {
45                     Console.WriteLine("key={0}", n);                
46                 }
47             //8.得到哈希表值的集合
48             Dictionary<int, string>.ValueCollection valCol = myDictionary.Values;
49                 //遍历值的集合
50                 foreach( string s in valCol)
51                 {
52                 Console.WriteLine("value：{0}",s);
53                 }
54             //9.使用TryGetValue方法获取指定键对应的值
55             string slove = string.Empty;
56             if (myDictionary.TryGetValue(5, out slove))
57             {
58                 Console.WriteLine("查找结果：{0}", slove);
59             }
60             else
61             {
62                 Console.WriteLine("查找失败");
63             }
64             //10.清空哈希表
65             //myDictionary.Clear();
66             Console.ReadKey();
67         }
68     }
69 }