BackgroundWorker 组件

代码：

 static void Main(string[] args)
        {
            BackgroundWorker bw = new BackgroundWorker();
            bw.WorkerReportsProgress = true;
            bw.WorkerSupportsCancellation = true;
            bw.DoWork += Worker_doWork;
            bw.ProgressChanged += Worker_ProcessChanged;
            bw.RunWorkerCompleted += Worker_Completed;
            bw.RunWorkerAsync();
            Console.WriteLine("Press C to Cancel");
            do
            {
                if (Console.ReadKey(true).KeyChar == 'C')
                {
                    bw.CancelAsync();
                }
            }
            while (bw.IsBusy);
        }

        static void Worker_doWork(object sender, DoWorkEventArgs e)
        {
            Console.WriteLine("当前线程ID：{0}", Thread.CurrentThread.ManagedThreadId);
            BackgroundWorker bw = (BackgroundWorker)sender;
            for (int i = 1; i <= 100; i++)
            {
                if (bw.CancellationPending == true)
                {
                    e.Cancel = true;
                    return;
                }
                if (i % 10 == 0)
                {
                    bw.ReportProgress(i);
                }
                Thread.Sleep(TimeSpan.FromSeconds(0.1));
            }
            e.Result = 42;
        }

        static void Worker_ProcessChanged(object sender, ProgressChangedEventArgs e)
        {
            Console.WriteLine("%{0} is Completed. process thread pool thread id {1}", e.ProgressPercentage, Thread.CurrentThread.ManagedThreadId);
        }
        static void Worker_Completed(object sender, RunWorkerCompletedEventArgs e)
        {
            Console.WriteLine("完成的线程ID：{0}",Thread.CurrentThread.ManagedThreadId);
            if (e.Error != null)
            {
                Console.WriteLine(e.Error.Message);
            }
            else if (e.Cancelled)
            {
                Console.WriteLine("Operation has been canceled");
            }
            else
            {
                Console.WriteLine("The Answer is {0}:",e.Result);
            }
        }

运行结果：