1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using System.Linq;
5. using System.Text;
6.  
7. namespace IEnumerableTest
8. {
9.     class Program
10.     {
11.         public static IEnumerable GetNextValue()
12.         {
13.             yield return "111111";
14.             yield return "222222";
15.             yield return "333333";
16.             yield return "444444";
17.             yield break;
18.             yield return "555555";
19.         }
20.         static void Main(string[] args)
21.         {
22.             Console.WriteLine("===迭代成员===");
23.             foreach (string item in GetNextValue())
24.             {
25.                 Console.WriteLine(item);
26.             }
27.  
28.             Console.WriteLine("===迭代类===");
29.             Months months = new Months();
30.             foreach (string item in months)
31.             {
32.                 Console.WriteLine(item);
33.             }
34.             Console.ReadKey();
35.         }
36.     }
37.  
38.     class Months : IEnumerable
39.     {
40.         string[] months = { "January","February","March","April","May","June","July","August","September","October","November","December"};
41.         public IEnumerator GetEnumerator()
42.         {
43.             for (int i = 0; i < months.Length; i++)
44.             { 
45.                 yield return months[i];
46.             }
47.         }
48.     }
49. }