C#基础 依赖BackgroundWorker类多线程实现进度条 代码示例

    class Program
    {
        static BackgroundWorker bw;

        static void Main(string[] args)
        {
            bw = new BackgroundWorker
            {
                WorkerReportsProgress = true,
                WorkerSupportsCancellation = true
            };

            bw.DoWork += Bw_DoWork;
            bw.ProgressChanged += Bw_ProgressChanged;
            bw.RunWorkerCompleted += Bw_RunWorkerCompleted;
            //开始工作(新线程)
            bw.RunWorkerAsync("Hello");

            Console.ReadLine();
            if (bw.IsBusy)
                bw.CancelAsync();
            Console.ReadLine();
        }

        //工作进度完成事件
        private static void Bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
                Console.WriteLine("You canclled!");
            }
            else if (e.Error != null)
            {
                Console.WriteLine($"Error:{e.Error}");
            }
            else
                Console.WriteLine($"Completed-{e.Result}");
        }

        //进度改变后事件
        private static void Bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            Console.WriteLine($"Reached {e.ProgressPercentage}%");
        }

        private static void Bw_DoWork(object sender, DoWorkEventArgs e)
        {
            while (true)
            {
                Console.WriteLine("Press Enter in the next 5 seconds to cancel");
                for (int i = 0; i <= 100; i += 20)
                {
                    //若是取消了
                    if (bw.CancellationPending)
                    {
                        e.Cancel = true;
                        return;
                    }
                    //报告进度变化，引发进度改变事件
                    bw.ReportProgress(i);
                    Thread.Sleep(1000);
                }
                e.Result = 123;
            }
        }
    }