Task和Thread启动、暂停、继续、退出操作

演示效果如下：

task的操作源代码如下：

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp
{
    public partial class Form1 : Form
    {
        CancellationTokenSource tokenSource;
        ManualResetEvent resetEvent;

        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 启动
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            if (tokenSource != null)
            {
                tokenSource.Cancel();
            }

            tokenSource = new CancellationTokenSource();
            resetEvent = new ManualResetEvent(true);
            CancellationToken token = tokenSource.Token;
            Task task = new Task(() =>
            {
                int num = 0;
                while (true)
                {
                    if (token.IsCancellationRequested)
                    {
                        this.BeginInvoke((EventHandler)(delegate { label1.Text = "退出"; }));
                        break;
                    }
                    // 初始化为true时执行WaitOne不阻塞
                    resetEvent.WaitOne();
                    this.BeginInvoke((EventHandler)(delegate { label1.Text = (num++).ToString(); }));
                    Thread.Sleep(200);
                }
            }, token);
            task.Start();
        }

        /// <summary>
        /// 暂停
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            resetEvent.Reset();
        }

        /// <summary>
        /// 继续
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            resetEvent.Set();
        }

        /// <summary>
        /// 退出
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_Click(object sender, EventArgs e)
        {
            tokenSource.Cancel();
        }
    }
}

Thread的启动操作如下，同时添加了Thread线程的退出检测，以及Thread参数传递。

演示效果如下：

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp
{
    public partial class Form1 : Form
    {
        CancellationTokenSource tokenSource;
        ManualResetEvent resetEvent;

        public Form1()
        {
            InitializeComponent();
        }

        private void test(object obj)
        {
            var a = ((string, int))obj; // 传递多个参数的方式

            if (tokenSource != null)
            {
                tokenSource.Cancel();
            }

            tokenSource = new CancellationTokenSource();
            resetEvent = new ManualResetEvent(true);
            CancellationToken token = tokenSource.Token;

            int num = 0;
            while (true)
            {
                if (token.IsCancellationRequested)
                {
                    this.BeginInvoke((EventHandler)(delegate { label1.Text = "退出"; }));
                    break;
                }
                // 初始化为true时执行WaitOne不阻塞
                resetEvent.WaitOne();
                this.BeginInvoke((EventHandler)(delegate { label1.Text = (num++).ToString(); }));
                Thread.Sleep(200);
            }
        }

        private void StopSchedule(Thread t)
        {
            new Task(() =>
            {
                bool ret = true;
                while (ret)
                {
                    this.BeginInvoke((EventHandler)(delegate
                    {
                        ret = t.IsAlive;
                        label2.Text = t.IsAlive.ToString();
                    }));
                    Thread.Sleep(1000);
                }
            }).Start();
        }

        /// <summary>
        /// 启动
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(new ParameterizedThreadStart(test));
            t.Start(("OK", 123)); // 传递多个参数
            StopSchedule(t); // 等待Thread结束
        }

        /// <summary>
        /// 暂停
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            resetEvent.Reset();
        }

        /// <summary>
        /// 继续
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            resetEvent.Set();
        }

        /// <summary>
        /// 退出
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_Click(object sender, EventArgs e)
        {
            tokenSource.Cancel();
        }
    }
}