IEnumerable amp; IEnumerator介面的實作

        PersonCollection persons = new PersonCollection ( new Person[]{new Person("Larry")});
        foreach (Person person in persons)
        {
            Console.WriteLine(person.Name);
        }
        foreach (Person person in persons)
        {
            Console.WriteLine(person.Name);
        } 
    }
}

  public class Person {
      public string Name { get; set; }

      public Person(string name)
      {
          this.Name = name;
      }
}


public class PersonCollection : IEnumerable,IEnumerator 
{
    private Person[] _peoples;
    private int position = -1;

    public PersonCollection(Person[] list)
    {
        _peoples = list;
    }

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

    public void Reset()
    {
        position = -1;
    }

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

    public IEnumerator GetEnumerator()
    {
        return new PersonCollection(_peoples);
    }
}</pre>

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