.NET ThreadPool 线程池 控制台 和 Winform 应用

一.控制台程序应用线程池

namespace ThreadPoolExample
{
    class Program
    {
        static void Main()
        {
            WaitCallback callBack = new WaitCallback(PooledFunc);
            ThreadPool.QueueUserWorkItem(callBack, "ABC");
            ThreadPool.QueueUserWorkItem(callBack, "BCD");
            ThreadPool.QueueUserWorkItem(callBack, "CDE");
            Console.ReadLine();
        }
        static void PooledFunc(object state)
        {
            int ThisThreadNumber=Thread.CurrentThread.GetHashCode();
            bool isThreadPoolThread=Thread.CurrentThread.IsThreadPoolThread;
            Console.WriteLine(string.Format("线程{0} 已开始,是否为线程池中的线程: {1}",ThisThreadNumber,isThreadPoolThread.ToString()));
            //暂停4秒       
            Thread.Sleep(4000);
            Console.WriteLine(string.Format("线程{0} 已结束,是否为线程池中的线程: {1}", ThisThreadNumber, isThreadPoolThread.ToString()));
        }
    }
}

运行结果如图所示：（我们可以清楚的看到线程池先后启动了3个线程来执行相应方法）

=====================================================================================================

二.Winform 应用程序使用ThreadPool

1.窗体类 Form1.cs

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 点击开始按钮
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //自定义执行类
            ExeCuteManager execute = new ExeCuteManager();
            execute.StateChangeEvent += new ExeCuteManager.DelArgInfo(execute_StateChangeEvent);//执行状态更改，事件订阅
            WaitCallback callBack = new WaitCallback(execute.DelPolFun);
            ThreadPool.QueueUserWorkItem(callBack, 1);
            ThreadPool.QueueUserWorkItem(callBack, 2);
            ThreadPool.QueueUserWorkItem(callBack, 3);
        }
        void execute_StateChangeEvent(string strTipInfo, int Number,bool IsEnd)
        {
            if (this.InvokeRequired)
            {
                this.BeginInvoke(new ExeCuteManager.DelArgInfo(DelPolfun), new object[] { strTipInfo, Number, IsEnd });
            }
            else
            {
                DelPolfun(strTipInfo, Number, IsEnd);
            }
        }
        /// <summary>
        /// 将状态信息添加到 ListBox控件(listBox1)
        /// </summary>
        /// <param name="strTipInfo"></param>
        /// <param name="Number"></param>
        /// <param name="IsEnd"></param>
        private void DelPolfun(string strTipInfo, int Number,bool IsEnd)
        {
            this.listBox1.Items.Add(strTipInfo);
            if (Number == 3 && IsEnd)
            {
                this.listBox1.Items.Add(string.Format("所有的线程执行结束！"));
            }
        }
    }

2.自定义执行类ExeCuteManager.cs

/// <summary>
    /// 执行类
    /// </summary>
    public class ExeCuteManager
    {
        /// <summary>
        /// 执行状态改变通知界面显示--委托
        /// </summary>
        /// <param name="strTipInfo"></param>
        /// <param name="Number"></param>
        /// <param name="IsEnd"></param>
        public delegate void DelArgInfo(string strTipInfo,int Number,bool IsEnd);
        /// <summary>
        /// 执行状态更改--事件
        /// </summary>
        public event DelArgInfo StateChangeEvent;
        public void DelPolFun(object _stateInfo)
        {
            int IntNumber=(int)_stateInfo;
            //获得当前线程的哈希码(标识线程在线程池中的唯一)
            int ThisThreadNumber=Thread.CurrentThread.GetHashCode();
            //指示当前线程是否属于托管线程池
            bool isThreadPool=Thread.CurrentThread.IsThreadPoolThread;
            if (StateChangeEvent != null)
            {
                string strTip = string.Format("请求 {0} 开始,线程哈希码为{1},是否为线程池线程:{2},...", IntNumber, ThisThreadNumber, isThreadPool.ToString());
               StateChangeEvent(strTip, IntNumber,false);
            }
            Thread.Sleep(4000);
            if (StateChangeEvent != null)
            {
                string strTip = string.Format("请求 {0} 执行结束!", IntNumber);
                StateChangeEvent(strTip,IntNumber,true);
            }
        }
    }

运行结果如图：

使用在Winform 项目中，虽然我们没有使用 new Thread()方式创新新线程，并显示指定相应方法在线程中执行，如：

 Thread newthread = new Thread(new ThreadStart(function));
 newthread.IsBackground = true;
 newthread.Start();

但最终程序在运行过程中，界面并没有被阻止，说明相应的方法是在线程中去执行的。

我们可以看到线程池会自动帮我们创建相应的新线程，并在线程中执行相应的方法，将运行状态通过自定义事件通知界面，然后界面更新显示