IEnumerable与IEnumerator

 static void Main(string[] args)
        {
            MyClass cl=new MyClass();
            foreach (Notm notm in cl)
            {
                Console.WriteLine("{0}+l,{1}+h",notm.l,notm.h);
               
            }
            Console.ReadLine();
            //要反转的值序列
            foreach (Notm notm in cl.GetEnumerableReverse())
            {
                Console.WriteLine("{0}+l,{1}+h", notm.l, notm.h);

            }
            Console.ReadLine();
            foreach (Notm notm in cl.GetMaxEnumerable(200))
            {
                Console.WriteLine("{0}+l,{1}+h", notm.l, notm.h);

            }
            Console.ReadLine();

        }

枚集器实现迭代器 

为了实现迭代器接口 MyClass先要实现枚集器接口 因此myclass要继承IEnumerable 枚集接口

 public class MyClass : IEnumerable 
    {
      private  Notm[] notms=new Notm[5];

        public MyClass()
        {
            for (int i = 0; i < 5; i++)
            {
                notms[i]=new Notm(i+10,i+200);
            }
        }
        //实现迭代
        public IEnumerator GetEnumerator()
        {
            return notms.GetEnumerator();
            //yield return notms[1];
            //yield return notms[4];
        }

        public IEnumerable GetMaxEnumerable(int h)
        {
            foreach (Notm notm in notms)
            {
                if (notm.h>h)
                {
                    yield return notm;
                }
            }
        }

        public IEnumerable GetEnumerableReverse()
        {//要反转的值序列
            return notms.Reverse();

        }
    }

 

publicclass Notm

    {
        public int l { get; set; }
        public int h { get; set; }

        public Notm(int l, int h)
        {
            this.l = l;
            this.h = h;
        }

    }

知识来源 http://v.youku.com/v_show/id_XMTUyODk3NzU5Ng==.html#paction