GetEnumerator, yield关键字

1. 使用了yield关键字，就不需要人工再实现下面的IEnumerator接口了

namespace System.Collections
{
    public interface IEnumerator
    {
        object Current { get; }

        bool MoveNext();

        void Reset();
    }
}

2. code sample

using System;
using System.Collections.Generic;

namespace serialization
{
    class Program1
    {
        public static void Main1(string[] args)
        {
            TestManager testManager = new TestManager();

            foreach (string item in testManager)
            {
                Console.WriteLine(item);
            }
        }
    }

    class TestManager
    {
        private List<string> internalObjests = new List<string>();

        public TestManager()
        {
            string[] stringArray = new string[] { "item 1", "item 2", "item 3", "item 4", "item 5" };

            //Array
            this.internalObjests.AddRange(stringArray);
        }

        public System.Collections.IEnumerator GetEnumerator()
        {
            foreach (string item in this.internalObjests)
            {
                yield return item;
            }
        }
    }
}

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