前言：看了書上兩個使用C#4.0并行編程的demo，又對照以前收藏的網上幾篇講述線程池的雄文，一并整理，寫個示例總結一下。寫這篇文章的時候，發現關于線程的好幾個基礎的重要的知識點自己都不熟悉，而且可能習慣性認知淺薄，所以痛苦的無以復加，不知道到底要說什么。不想看文章的可以直接下載最后的示例，本文代碼主要參考Marc Clifton的“.NET's ThreadPool Class - Behind The Scenes”，對新手也許有幫助。

　　參考：

　　http://msdn.microsoft.com/zh-cn/library/system.threading.threadpool(VS.80).ASPx

　　http://www.codeproject.com/KB/threads/threadtests.ASPx

　　http://www.codeproject.com/KB/threads/smartthreadpool.ASPx

　　http://blog.zhaojie.me/2009/07/thread-pool-1-the-goal-and-the-clr-thread-pool.html  （老趙的淺談線程池上中下三篇）

　　先大概看一下控制臺應用程序的Main方法的主要代碼：

        static bool done = false;
        static decimal count2 = 0;
        static int threadDone = 0;//標志啟用線程數?
        static System.Timers.Timer timer = new System.Timers.Timer(1000);

        static decimal[] threadPoolCounters = new decimal[10];
        static Thread[] threads = new Thread[10];
        static System.Timers.Timer[] threadTimers = new System.Timers.Timer[10];

        static void Main(string[] args)
        {
            timer.Stop();
            /*當 AutoReset 設置為 false 時，Timer 只在第一個 Interval 過后引發一次 Elapsed 事件。
             若要保持以 Interval 時間間隔引發 Elapsed 事件，請將 AutoReset 設置為 true。*/
            timer.AutoReset = false;
            timer.Elapsed += new ElapsedEventHandler(OnTimerEvent);//當timer.Start()時，觸發事件
            decimal total = 0;

            // raw test
            decimal count1 = SingleThreadTest();//單一線程，一跑到底
            Console.WriteLine("Single thread count = " + count1.ToString());

            // create one thread, increment counter, destroy thread, repeat
            Console.WriteLine();
            CreateAndDestroyTest();//創建一個線程，運算，然后銷毀該線程 重復前面的動作
            Console.WriteLine("Create and destroy per count = " + count2.ToString());

            // Create 10 threads and run them simultaneously
            //一次性創建10個線程，然后遍歷使線程執行運算
            Console.WriteLine();
            InitThreadPoolCounters();
            InitThreads();
            StartThreads();
            while (threadDone != 10) { };
            Console.WriteLine("10 simultaneous threads:");
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine("T" + i.ToString() + " = " + threadPoolCounters[i].ToString() + "   ");
                total += threadPoolCounters[i];
            }
            Console.WriteLine("Total = " + total.ToString());
            Console.WriteLine();

            Console.WriteLine("///////////////////////////////////////////////////");

            // using ThreadPool
            //直接通過線程池的QueueUserWorkItem方法，按隊列執行10個任務
            Console.WriteLine();
            Console.WriteLine("ThreadPool:");
            InitThreadPoolCounters();
            QueueThreadPoolThreads();
            while (threadDone != 10) { };
            Console.WriteLine("ThreadPool: 10 simultaneous threads:");
            total = 0;
            for (int i = 0; i < 10; i++)
            {
                //                threadTimers[i].Stop();
                //                threadTimers[i].Dispose();
                Console.WriteLine("T" + i.ToString() + " = " + threadPoolCounters[i].ToString() + "   ");
                total += threadPoolCounters[i];
            }
            Console.WriteLine("Total = " + total.ToString());

            // using SmartThreadPool
            //通過Amir Bar的SmartThreadPool線程池，利用QueueUserWorkItem方法，按隊列執行10個任務
            Console.WriteLine();
            Console.WriteLine("SmartThreadPool:");
            InitThreadPoolCounters();
            QueueSmartThreadPoolThreads();
            while (threadDone != 10) { };
            Console.WriteLine("SmartThreadPool: 10 simultaneous threads:");
            total = 0;
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine("T" + i.ToString() + " = " + threadPoolCounters[i].ToString() + "   ");
                total += threadPoolCounters[i];
            }
            Console.WriteLine("Total = " + total.ToString());

            // using ManagedThreadPool
            //通過Stephen Toub改進后的線程池，利用QueueUserWorkItem方法，按隊列執行10個任務
            Console.WriteLine();
            Console.WriteLine("ManagedThreadPool:");
            InitThreadPoolCounters();
            QueueManagedThreadPoolThreads();
            while (threadDone != 10) { };
            Console.WriteLine("ManagedThreadPool: 10 simultaneous threads:");
            total = 0;
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine("T" + i.ToString() + " = " + threadPoolCounters[i].ToString() + "   ");
                total += threadPoolCounters[i];
            }
            Console.WriteLine("Total = " + total.ToString());

            // using C#4.0 Parallel
            //通過Tasks.Parallel.For進行并行運算
            Console.WriteLine();
            Console.WriteLine("Parallel:");
            InitThreadPoolCounters();
            UseParallelTasks();
            while (threadDone != 10) { };
            Console.WriteLine("Parallel: 10 simultaneous threads:");
            total = 0;
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine("T" + i.ToString() + " = " + threadPoolCounters[i].ToString() + "   ");
                total += threadPoolCounters[i];
            }
            Console.WriteLine("Total = " + total.ToString());
        }        

        

        
        
      
        
NET技術：關于C#線程，線程池和并行運算的簡單使用和對比，轉載需保留來源！
        
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