线程池循环执行

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;namespace ConsoleApplication6{    class Program    {        static void Main(string[] args)        {            LockObj lockObjs = new LockObj();            List<Item> fullList = new List<Item>();            fullList.Add(new Item(1, 2, lockObjs));            fullList.Add(new Item(2, 3, lockObjs));            fullList.Add(new Item(3, 2, lockObjs));            fullList.Add(new Item(4, 3, lockObjs));            fullList.Add(new Item(5, 2, lockObjs));            fullList.Add(new Item(6, 3, lockObjs));            fullList.Add(new Item(7, 3, lockObjs));            fullList.Add(new Item(8, 2, lockObjs));            fullList.Add(new Item(9, 3, lockObjs));            fullList.Add(new Item(10, 2, lockObjs));            fullList.ForEach(p => lockObjs.QueuePending.Enqueue(p));            //加监控任务，完全靠监控对象驱动所有的任务            Item monitor = new Item(lockObjs);            ThreadPool.QueueUserWorkItem(new WaitCallback(monitor.Monitor), null);            Console.Read();        }    }    public class LockObj    {        public LockObj()        {            this.QueuePending = new Queue<Item>();            this.QueueDisabled = new Queue<Item>();            this.ActiveCount = 0;        }        //正处理队列          public Queue<Item> QueuePending { get; set; }        //被禁用队列          public Queue<Item> QueueDisabled { get; set; }        /// <summary>        /// 活动任务数量        /// </summary>        public int ActiveCount { get; set; }    }    public class Item    {        #region [属性]        public int Flag { get; set; }        public int WaitMs { get; set; }        public LockObj LockObj { get; set; }        public DateTime BeginTime { get; set; }        public DateTime EndTime { get; set; }        public double ElaspedSeconds        {            get            {                return this.EndTime.Subtract(this.BeginTime).TotalSeconds;            }        }        #endregion        /// <summary>          /// 监控用构造函数          /// </summary>          /// <param name="_LockObj"></param>          public Item(LockObj _LockObj)        {            this.LockObj = _LockObj;        }        /// <summary>          /// 普通任务用的构造函数          /// </summary>          /// <param name="_Flag"></param>          /// <param name="_WaitSeconds"></param>          /// <param name="_LockQueues"></param>          public Item(int _Flag, int _WaitSeconds, LockObj _LockObj)        {            this.Flag = _Flag;            this.WaitMs = _WaitSeconds * 1000;            this.LockObj = _LockObj;        }        public void Monitor(object obj)        {            lock (this.LockObj)            {                //如果有禁用的，将其加入到等待列表队尾                  if (this.LockObj.QueueDisabled.Count > 0)                {                    for (int i = this.LockObj.QueueDisabled.Count - 1; i >= 0; i--)                    {                        Item item = this.LockObj.QueueDisabled.Dequeue();                        this.LockObj.QueuePending.Enqueue(item);                        Console.WriteLine("Move Item {0} Form QueueDisabled To QueuePending", item.Flag);                    }                }                //如果数量不够，则将等待列表中的加到执行列表                  if (this.LockObj.ActiveCount < 2)                {                    int maxNum = 2 - this.LockObj.ActiveCount;                    for (int i = 0; i < maxNum; i++)                    {                        Item item = this.LockObj.QueuePending.Dequeue();                        ThreadPool.QueueUserWorkItem(new WaitCallback(item.Exec), null);                    }                    this.LockObj.ActiveCount = 2;                }            }            Thread.Sleep(1000);            ThreadPool.QueueUserWorkItem(new WaitCallback(this.Monitor), null);        }        public void Exec(object obj)        {            this.BeginTime = DateTime.Now;            Thread.Sleep(this.WaitMs);            this.EndTime = DateTime.Now;            Console.WriteLine("Flag:{0}, BeginTime:{1:HH:mm:ss,ms}, EndTime: {2:HH:mm:ss,ms}, ElapsedSeconds:{3}"                    , this.Flag < 10 ? " " + this.Flag.ToString() : this.Flag.ToString()                    , this.BeginTime                    , this.EndTime                    , this.ElaspedSeconds                    );            lock (this.LockObj)            {                //模拟此对象可能遇到了异常情况                //异常则将此对象放入到禁用队列                  if (new Random().Next(0, 10) < 2)                {                    Console.WriteLine("Item : {0} is Disabled.", this.Flag);                    this.LockObj.QueueDisabled.Enqueue(this);                }                //无异常则将此对象加入到队尾                else                {                    this.LockObj.QueuePending.Enqueue(this);                }                //从队首取出对象执行                  Item itemExec = this.LockObj.QueuePending.Dequeue();                ThreadPool.QueueUserWorkItem(new WaitCallback(itemExec.Exec), null);            }        }    }//end of class Item  }//end of namespace