C#IEnumerable 接口

IEnumerable 接口
公开枚举数，该枚举数支持在非泛型集合上进行简单迭代。
命名空间：System.Collections

public class Person    {        public string firstName;        public string lastName;        public Person(string fName, string lName)        {            this.firstName = fName;            this.lastName = lName;        }    }    public class People : IEnumerable    {        private Person[] _person;        public People(Person[] pArray)        {            _person = new Person[pArray.Length];            for (int i = 0; i < pArray.Length; i++)                _person[i] = pArray[i];        }        public PeopleEnum GetEnumerator()//返回PeopleEnum当前实例        {            return new PeopleEnum(_person);        }        IEnumerator IEnumerable.GetEnumerator()        {            return (IEnumerator)GetEnumerator();        }    }    public class PeopleEnum : IEnumerator    {        int position = -1;        public Person[] _person;        public PeopleEnum(Person[] list)        {            _person = list;        }        public Person Current        {            get            {                try { return _person[position]; }                catch (IndexOutOfRangeException) { throw new InvalidOperationException(); }            }        }        object IEnumerator.Current        {            get { return Current; }        }        public bool MoveNext()        {            position++;            return (position < _person.Length);        }        public void Reset()        {            position = -1;        }    }

测试一下：

static void Main(string[] args)        {            Person[] peopleArray = new Person[3]             {                 new Person("John", "Smith"),                new Person("Jim", "Johnson"),                new Person("Sue", "Rabon")            };            People peopleList = new People(peopleArray);            foreach (Person p in peopleList)                Console.WriteLine((p.firstName + " " + p.lastName));            Console.ReadKey();        }

效果如下：