针对上一篇《单例模式基类如何初始化子类》中有关线程启动停止的优化

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

namespace HuluChajian.ThreadHelper
{
    /// <summary>此单例只能在主线程执行,未做线程安全处理</summary>
    internal class ThreadHelper<T> where T : class
    {
        static T _instance;
        public static T Instance { get { return _instance == null ? _instance = (T)System.Reflection.Assembly.GetAssembly(typeof(T)).CreateInstance(typeof(T).ToString()) : _instance; } }

        int _index = -1;
        /// <summary>记录启动过的线程的标志位,当有线程在运行状态时,此列表应只有最后一个元素为true</summary>
        protected List<bool> isStartLst = new List<bool>();

        /// <summary>标识线程是否已经启动,已经启动值为true</summary>
        protected bool isStart = false;

        /// <summary>启动线程</summary>
        public void Start()
        {
            if (isStart) { return; }//已经启动过不能再次启动,直接返回.
            isStart = true;
            _index++;
            isStartLst.Add(isStart);
            StartTop(_index);
        }

        /// <summary>启动时需要调用的自定义方法,需要自行调用线程[一般情况下不重写此方法,重写时需要完全重写此方法,即重写时不可保留 base.StartTop();]</summary>
        protected virtual void StartTop(int index)
        {
            new Thread((o) =>
            {
                while (isStartLst[(int)o])
                {
                    Internal_Start();
                }
            }).Start(index);
        }
        /// <summary>启动的线程需要执行的操作,重写时无需保留 base.Internal_Start();</summary>
        protected virtual void Internal_Start()
        {
            Console.WriteLine("启动父线程,线程ID:" + Thread.CurrentThread.ManagedThreadId);

            Thread.Sleep(1000);//每隔1秒执行一次 
        }

        /// <summary>停止线程</summary>
        public void Stop()
        {
            isStart = false;
            if (_index!=-1) { isStartLst[_index] = false; }
            Internal_Stop();
        }

        /// <summary>停止线程需要调用的自定义方法,重写时无需保留 base.Internal_Stop();</summary>
        protected virtual void Internal_Stop()
        {
            Console.WriteLine("停止父线程");
        }
    }
}