C# 迭代器实现

参考 李志. Learning hard C#学习笔记 (图灵原创) (p. 119). 人民邮电出版社. Kindle 版本.

    public class Friend
    {
        string name;
        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }
        public Friend(string name)
        {
            this.name = name;
        }

    }
    public class Friends : IEnumerable
    {
        List<Friend> fname_list;
        public Friends(List<string> nlist)
        {
            fname_list = new List<Friend>();
            foreach (var item in nlist)
            {
                fname_list.Add(new Friend(item));
            }
        }
        public IEnumerator GetEnumerator()
        {
            for (int i = 0; i < fname_list.Count; i++)
            {
                yield return fname_list[i];
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Friends tfs = new Friends(new List<string>() { "aa","bb","cc" });

            foreach (Friend item in tfs)
            {
                Console.WriteLine(item.Name);
            }

            Console.ReadKey();
        }
    }