BackgroundWorker

BackgroundWorker backgroundWorker;

backgroundWorker = new BackgroundWorker {WorkerSupportsCancellation = true};

backgroundWorker.DoWork += (s, e) =>
{
   while (!backgroundWorker.CancellationPending)
   {
     // Do...
   }

   e.Cancel = true;
};

backgroundWorker.RunWorkerAsync();

// 终止线程

backgroundWorker.CancelAsync();

当执行CancelAsync()时并没有真正终止线程而是将CancellationPending标记为ture e.Cancel=true才是真正终止