Task的用法学习（一）

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using System;using System.Collections.Generic;using System.Threading.Tasks;using System.Threading;namespace TaskTest2{    class Program    {        static void Main(string[] args)        {            Console.WriteLine("任务初始化！");            EventHelper evtHelper = new EventHelper();            Task<bool> mainTask = Task.Factory.StartNew<bool>(() => {                evtHelper.IsRuning = true;                evtHelper.InitTask();                evtHelper.IsRuning = false;                return true;            });            Thread.Sleep(TimeSpan.FromSeconds(5));            Task sonTask = Task.Factory.StartNew(() =>            {                Console.WriteLine("开始子任务！");                evtHelper.DoTask();                Console.WriteLine("任务完成！");            });                        Console.ReadLine();        }    }    public class TaskModel    {        public int Index { set; get; }        public string Name { set; get; }    }    public class EventHelper    {        TaskHelper th = new TaskHelper();        public bool IsRuning { set; get; }        /// <summary>        /// 最大并行任务数        /// </summary>        const int MaxThreadNum = 5;        /// <summary>        /// 队列中允许的最大任务数        /// </summary>        const int MaxTaskNum = 30;        int TaskIndex = 0;        public void InitTask()        {            for (int i = 0; i < 2000; i++)            {                TaskModel t = new TaskModel();                t.Index = i + 1;                t.Name = "任务[" + t.Index + "]";                th.AddTask(t);                Console.WriteLine("写入第{0}个任务！",t.Index);                while (th.Count > MaxTaskNum)                {                    Console.WriteLine("当前任务队列中的任务数为：{0},超过了允行并行的最大任务数：{1},线程等待中...",th.Count,MaxTaskNum);                    Thread.Sleep(TimeSpan.FromSeconds(1));                }            }        }        public void DoTask()        {            while (IsRuning)            {                if (!th.IsQueueActive)                {                    Thread.Sleep(TimeSpan.FromSeconds(2));                    continue;                }                if (th.Count == 0) break;                Console.WriteLine("队列中有{0}个任务！", th.Count);                Task[] tasks = new Task[MaxThreadNum];                for (int i = 0; i < MaxThreadNum; i++)                {                    tasks[i] = new Task(() => {                        DoSingleTask(TaskIndex);                    });                    tasks[i].Start();                }                Task.WaitAll(tasks);            }        }        public void DoSingleTask(object obj)        {            if (th.IsQueueActive)            {                TaskModel tm = th.GetOneTask();                if (tm == null) return;                Console.WriteLine("已经完成任务-----{0}", tm.Name);                Thread.Sleep(TimeSpan.FromSeconds(1));                Interlocked.Increment(ref TaskIndex);            }        }    }    public class TaskHelper    {        public Queue<TaskModel> TaskList = new Queue<TaskModel>();        public void AddTask(TaskModel tm)        {            lock (this)            {                TaskList.Enqueue(tm);            }        }        public TaskModel GetOneTask()        {            lock (this)            {                if (TaskList == null || TaskList.Count == 0) return null;               return TaskList.Dequeue();            }        }        public void ClearList()        {            TaskList.Clear();        }        public bool IsQueueActive        {            get { return TaskList.Count > 0; }        }        public int Count        {            get { return TaskList.Count; }        }    }}
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