TPL

Code Snippetusing System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks; namespace WpfApplication1{ public class TBackgroundWorker<TResult, TProgress> {  public static TBackgroundWorker<TResult, TProgress> New() { return new TBackgroundWorker<TResult, TProgress>(); }  public TBackgroundWorker<TResult, TProgress> StartWith(Func<object, CancellationToken, TResult> work) { Start = work; return this; }  public TBackgroundWorker<TResult, TProgress> FinishWith(Action<TResult,object> finish) { Finish = finish; return this; }  private readonly CancellationTokenSource _cancelationTokenSource; private CancellationToken _cancellationToken; private readonly TaskScheduler _uiScheduler;   public TBackgroundWorker() { _cancelationTokenSource = new CancellationTokenSource(); _uiScheduler = TaskScheduler.FromCurrentSynchronizationContext(); }  protected Func<object, CancellationToken,TResult> Start { get; set; } protected Action<TResult, object> Finish { get; set; }  public void ReportProgress(Action<TProgress> progressReport,TProgress progress) { Task.Factory.StartNew(()=>progressReport(progress),CancellationToken.None,TaskCreationOptions.None,_uiScheduler); }  public TBackgroundWorker<TResult, TProgress> Begin(object state = null) { _cancellationToken = _cancelationTokenSource.Token; Task<TResult>.Factory. StartNew(()=>Start(state,_cancellationToken),_cancellationToken). ContinueWith(x => Finish(x.Result,state), _uiScheduler);  return this; }  public void Cancel() { _cancelationTokenSource.Cancel(true); } }} usage Code Snippetusing System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes; namespace WpfApplication1{ /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { private TBackgroundWorker<string, int> _bg;  public MainWindow() { InitializeComponent(); }  private void a_Click(object sender, RoutedEventArgs e) { _bg = TBackgroundWorker<string, int>.New(). StartWith(StartSomething). FinishWith(ShowResult). Begin(); }  private void ShowResult(string obj,object state) { a.Content = obj; }  private string StartSomething(object arg, CancellationToken cancellationToken) { int i = 0; while (i < 200) { if (cancellationToken.IsCancellationRequested) { return "Cacncelled"; } i++; Thread.Sleep(50); _bg.ReportProgress(Report,i); }  return "Done"; }  private void Report(int obj) { a.Content = obj; }  private void Button_Click(object sender, RoutedEventArgs e) { _bg.Cancel(); }  }}