天天向上

public class Worker
     {
         int m_cnt1 = 0, m_cnt2 = 0;
         Thread m_thread1;
         Thread m_thread2;
         TextBox m_textBox1, m_textBox2;
         readonly AutoResetEvent m_syncEvent1 = new AutoResetEvent(false);
         readonly AutoResetEvent m_syncEvent2 = new AutoResetEvent(true);
         ManualResetEvent m_pauseEvent = new ManualResetEvent(true);
         ManualResetEvent m_shutdownEvent = new ManualResetEvent(false);
         void Job1()
         {
             while (true)
             {
                 m_pauseEvent.WaitOne(Timeout.Infinite);
                 if (m_shutdownEvent.WaitOne(0))
                     break;
                 m_syncEvent2.WaitOne();
                 m_cnt1++;
                 m_textBox1.BeginInvoke((MethodInvoker)delegate {
                     m_textBox1.Text = m_cnt1.ToString();
                 });
                 Thread.Sleep(1);
                 m_syncEvent1.Set();
             }
         }
         void Job2()
         {
             while (true)
             {
                 m_pauseEvent.WaitOne(Timeout.Infinite);
                 if (m_shutdownEvent.WaitOne(0))
                     break;
                 m_syncEvent1.WaitOne();
                 m_cnt2++;
                 m_textBox2.BeginInvoke((MethodInvoker)delegate
                 {
                     m_textBox2.Text = m_cnt2.ToString();
                 });
                 Thread.Sleep(1);
                 m_syncEvent2.Set();
             }
         }
         public Worker() { }
         public Worker(TextBox textBox1, TextBox textBox2) 
         {
             m_textBox1 = textBox1;
             m_textBox2 = textBox2;
         }
         public void Start()
         {
             m_thread1 = new Thread(new ThreadStart(Job1));
             m_thread2 = new Thread(new ThreadStart(Job2));
             m_thread1.Start();
             m_thread2.Start();
         }
         public void Pause()
         {
             m_pauseEvent.Reset();
         }
         public void Resume()
         {
             m_pauseEvent.Set();
         }
         public void Stop()
         {
             m_shutdownEvent.Set();
             m_pauseEvent.Set();
             m_thread1.Join();
             m_thread2.Join();
             m_thread1 = null;
             m_thread2 = null;
         }
     }

public partial class Form1 : Form
    {
        Worker m_worker;
      
        public Form1()
        {
            InitializeComponent();
        }

        private void startToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //if(m_worker == null)
            m_worker = new Worker(textBox1, textBox2);
            m_worker.Start();
        }

        private void pauseToolStripMenuItem_Click(object sender, EventArgs e)
        {
            m_worker.Pause();
        }

        private void resumeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            m_worker.Resume();
        }

        private void stopToolStripMenuItem_Click(object sender, EventArgs e)
        {
            m_worker.Stop();
            m_worker = null;
            GC.Collect();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (m_worker != null)
            {
                m_worker.Stop();
                m_worker = null;
            }
            GC.Collect();
        }
    }