IEnumerator 枚举使用

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace TestEffectEntry
{
public class Person
{

public Person(string fName, string lName)
{

this.firstName = fName;

this.lastName = lName;

}

public string firstName;

public string lastName;

}

public class People : IEnumerable
{

private Person[] _people;

public People(Person[] pArray)
{

_people = new Person[pArray.Length];

for (int i = 0; i < pArray.Length; i++)
{

_people[i] = pArray[i];

}

        }
        public IEnumerator GetEnumerator()
        {

//return new PeopleEnum(_people);

//return _people.GetEnumerator();

for (int i = 0; i < _people.Length; i++)
{

                yield return _people[i];
            }
        }
    }

public class PeopleEnum : IEnumerator
{

public Person[] _people;

int position = -1;

        public PeopleEnum(Person[] list)
        {
            _people = list;
        }

        public bool MoveNext()
        {
            position++;
            return (position < _people.Length);
        }

        public void Reset()
        {
            position = -1;

}

        public object Current
        {
            get
            {
                try
                {
                    return _people[position];
                }
                catch (IndexOutOfRangeException)
                {
                    throw new InvalidOperationException();
                }
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Person[] peopleArray = new Person[3];
            peopleArray[0] = new Person("John", "Smith");
            peopleArray[1] = new Person("Jim", "Johnson");
            peopleArray[2] = new Person("Sue", "Rabon");

            People peopleList = new People(peopleArray);
           // foreach (Person p in peopleList)
            //    Console.WriteLine(p.firstName + " " + p.lastName);

            IEnumerator itor = peopleArray.GetEnumerator();
            while (itor.MoveNext())
            {
                Person p = itor.Current as Person;
                Console.WriteLine(p.firstName + " " + p.lastName);
            }
            Console.ReadKey();
        }
    }
}