一、封裝可重用類

   public class Async
    {
        protected BackgroundWorker bgWorker = new BackgroundWorker();
        /**
         * 業務方法
         */
        public static Async DoWork(Action<object?, DoWorkEventArgs> DoWork) {
            Async async = new();
            async.bgWorker.DoWork += new
 
 DoWorkEventHandler(DoWork);
            return async;
        }
        /**
        * 進度狀態
        */
        public Async ProgressChanged(Action<object?, ProgressChangedEventArgs> ProgessChanged)
        {
            bgWorker.WorkerReportsProgress = true;
            bgWorker.ProgressChanged 
 
+= new ProgressChangedEventHandler(ProgessChanged);
            return this;
        }
        /**
         * 結束狀態
         */
        public Async RunWorkerCompleted(Action<object?, RunWorkerCompletedEventArgs> WorkerCompleted)
        {
            bgWorker.WorkerSupportsCancellation = true;
            bgWorker.RunWorkerCompleted 
 
+= new RunWorkerCompletedEventHandler(WorkerCompleted);
            return this;
        }
        /**
         * 啟動
         */
        public BackgroundWorker Start(object? o) {
            if (bgWorker.IsBusy)
                return bgWorker;
            bgWorker.RunWorkerAsync(o);
            return bgWorker;
        }

    }

二、測試

1、不卡死介面測試

private void StartUpdateClick(object sender, RoutedEventArgs e){
  bgWorker = Async.DoWork(delegate (object? sender,DoWorkEventArgs e){
    for (int i=1;i<=100;i++) {Thread.Sleep(1000);}
 　}).Start(this);          
}

2、更新進度測試

private BackgroundWorker bgWorker;        
private void StartClick(object sender, RoutedEventArgs e)
        {
            bgWorker = Async.DoWork(delegate (object? sender, DoWorkEventArgs e){
                for (int i=1;i<=100;i++) {
                    bgWorker.ReportProgress(i);
                }
            }).ProgressChanged(delegate (object? sender, ProgressChangedEventArgs e) {
                ProgressBarBox.Value = e.ProgressPercentage;
            }).RunWorkerCompleted(delegate (object? sender, RunWorkerCompletedEventArgs e) {
                if (e.Error != null)
                {
                    MessageBox.Show(e.Error.ToString());
                    return;
                }
                if (!e.Cancelled)
                {
                    FinishBox.Visibility = Visibility.Visible;
                    QuitBox.Visibility = Visibility.Hidden;
                }
                else
                {
                    MessageBox.Show("處理終止!");
                }
            }).Start(this);
        }