上位机_C#多线程的取消、继续、停止

 public Form1()
        {
            InitializeComponent();
            Task.Run(async () =>
            {
               

                for (int i = 0; i < 1000; i++)
                {
                    if (cancellationToken.IsCancellationRequested) return;
                    manual.WaitOne();
                    this.Invoke(new Action(() => { textBox1.Text += i.ToString(); }));
                    await Task.Delay(1000);
                }
            }, cancellationToken.Token);
        }
        CancellationTokenSource cancellationToken = new CancellationTokenSource();
        ManualResetEvent manual = new ManualResetEvent(true);

        private void Form1_Load(object sender, EventArgs e)
        {

            cancellationToken.Token.Register(() => { MessageBox.Show("任务已停止"); });
        }

        private void button1_Click(object sender, EventArgs e)
        {
            manual.Reset();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            manual.Set();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            cancellationToken.Cancel();
        }