C#中Backgroundworker与Thread的区别

　　public partial class MainWindow : Window

　　{

　　private BackgroundWorker m_BackgroundWorker;// 申明后台对象

　　public MainWindow()

　　{

　　InitializeComponent();

　　m_BackgroundWorker = new BackgroundWorker(); // 实例化后台对象

　　m_BackgroundWorker.WorkerReportsProgress = true; // 设置可以通告进度

　　m_BackgroundWorker.WorkerSupportsCancellation = true; // 设置可以取消

　　m_BackgroundWorker.DoWork += new DoWorkEventHandler(DoWork);

　　m_BackgroundWorker.ProgressChanged += new ProgressChangedEventHandler(UpdateProgress);

　　m_BackgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(CompletedWork);

　　m_BackgroundWorker.RunWorkerAsync(this);

　　}

　　void DoWork(object sender, DoWorkEventArgs e)

　　{

　　BackgroundWorker bw = sender as BackgroundWorker;

　　MainWindow win = e.Argument as MainWindow;

　　int i = 0;

　　while ( i <= 100 )

　　{

　　if (bw.CancellationPending)

　　{

　　e.Cancel = true;

　　break;

　　}

　　bw.ReportProgress(i++);

　　Thread.Sleep(1000);

　　}

　　}

　　void UpdateProgress(object sender, ProgressChangedEventArgs e)

　　{

　　int progress = e.ProgressPercentage;

　　label1.Content = string.Format("{0}",progress);

　　}

　　void CompletedWork(object sender, RunWorkerCompletedEventArgs e)

　　{

　　if ( e.Error != null)

　　{

　　MessageBox.Show("Error");

　　}

　　else if (e.Cancelled)

　　{

　　MessageBox.Show("Canceled");

　　}

　　else

　　{

　　MessageBox.Show("Completed");

　　}

　　}

　　private void button1_Click(object sender, RoutedEventArgs e)

　　{

　　m_BackgroundWorker.CancelAsync();

　　}

　　}