5.12.3 迭代器的使用

//实现迭代器的类
public class Year : System.Collections.IEnumerable
{
string[] season = { "Spring", "Summer", "Autumn", "Winter" };
public System.Collections.IEnumerator GetEnumerator()
{
for (int i = 0; i < season.Length; i++)
{
yield return season[i];
}
}
}
class Program
{
static void Main(string[] args)
{
Year y = new Year();
//使用迭代器
foreach (string s in y)
{
System.Console.Write(s + "\n");
}
}
}