C#编程-97：索引器在类中的使用_彭世瑜_新浪博客

1. using System;

2. using System.Collections.Generic;

3. using System.Linq;

4. using System.Text;

5.  

6. namespace ClassIndexTest

7. {

8.     class IndexTest

9.     {

10.         private int[] myint = new int[10];

11.  

12.         public int this[int index]

13.         {

14.             get { 

15.             if(index>=0 && index<=9) return myint[index];

16.             else

17.                 return 0;

18.             }

19.             set {

20.                 if (index >= 0 && index <= 9) myint[index] = value;

21.             }

22.         }

23.  

24.     }

25.     class WeekDay

26.     {

27.          private string[] weeks = { "星期一","星期二","星期三","星期四","星期五","星期六","星期日"};

28.          private int GetDay(string weekday)

29.          {

30.              int i = 1;

31.              foreach (string week in weeks)

32.              {

33.                  if (week == weekday) return i;

34.                  i++;

35.              }

36.              return 0;       

37.          }

38.          public int this[string week]

39.          {

40.              get { return GetDay(week); }

41.          }

42.     }

43.     class Program

44.     {

45.         static void Main(string[] args)

46.         {

47.             //访问类实例

48.             IndexTest array = new IndexTest();

49.             array[0] = 11;

50.             array[-5] = 12;

51.             array[3] = 14;

52.             array[5] = 15;

53.             array[11] = 16;

54.             Console.WriteLine("array[0]={0}", array[0]);

55.             Console.WriteLine("array[-5]={0}", array[-5]);

56.             Console.WriteLine("array[3]={0}", array[3]);

57.             Console.WriteLine("array[5]={0}", array[5]);

58.             Console.WriteLine("array[11]={0}", array[11]);

59.             Console.WriteLine("array[6]={0}", array[6]);

60.  

61.             //访问类成员

62.             WeekDay weekday = new WeekDay();

63.             Console.WriteLine(weekday["星期一"]);

64.             Console.WriteLine(weekday["星期二"]);

65.             Console.WriteLine(weekday["星期五"]);

66.             Console.WriteLine(weekday["星期八"]);

67.             Console.ReadKey();

68.         }

69.     }

70. }

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