/*-------------------------------------------------------------------------
 * 功能描述：EnumeratorTest
 * 作者：xulisong
 * 创建时间： 2019/5/6 17:17:04
 * 版本号：v1.0
 *  -------------------------------------------------------------------------*/

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Test.Enumerator
{
    public class Node
    {
        public string Key { get; set; }
        public bool Visited { get; set; }
    }
    public class EnumeratorTest:IEnumerable<Node>
    {
        private List<Node> m_Nodes = new List<Node>();
        public EnumeratorTest()
        {
            for (int i = 0; i < 100; i++)
            {
                m_Nodes.Add(new Node() {Key = i.ToString(), Visited = false});
            }
            
        }
        public IEnumerator<Node> GetEnumerator()
        {
            //迭代返回
            if (m_Nodes == null|| !m_Nodes.Any())
                yield break;
            try
            {
                foreach (var node in m_Nodes)
                {
                    node.Visited = true;
                    yield return node;
                }             
            }
            finally
            {
                m_Nodes.ForEach(v => v.Visited = false);
            }
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }
    }
}