索引器的真面目

 1 namespace Test
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             Person p = new Person();
 8             p["name"] = "hello";
 9             Console.WriteLine(p[3]);
10             Console.WriteLine(p["name"]);
11             Console.ReadLine();
12 
13         }
14     }
15 
16     public class Person
17     {
18         private string name;
19         private int age;
20         private char[] ch = {‘q‘,‘r‘,‘m‘,‘d‘};
21 
22         public char this[int index]
23         {
24             get { return ch[index]; }
25             set { ch[index] = value; }
26         }
27         public string Msg { get; set; }
28 
29         public object this[string index]
30         {
31             get
32             {
33                 switch (index)
34                 {
35                     case"age":       
36                         return age;
37                     case "name":
38                         return name;
39                     default :
40                         return null;
41                 }
42             }
43             set
44             {
45                 switch (index)
46                 {
47                     case "name":
48                         name = value.ToString();
49                        break;
50                     case "age":
51                         age = (int) value;
52                         break;
53                 }
54             }
55         }
56       //  public string Item { get; set; }
57   
58     }
59 }