1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Windows.Forms; 9 10 namespace XXXX11 {12     public partial class BackGroundWorker : Form13     {14         public BackGroundWorker()15         {16             InitializeComponent();17             backgroundWorker1.WorkerReportsProgress = true;18             backgroundWorker1.WorkerSupportsCancellation = true;19             backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);20             backgroundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);21             backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);22             progressBar1.Maximum = 10000;23         }24 25         //这里就是通过响应消息，来处理界面的显示工作26         private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)27         {28             this.progressBar1.Value =http://www.mamicode.com/ e.ProgressPercentage;29             this.label1.Text = e.UserState.ToString();30             this.label1.Update();31         }32 33         //这里是后台工作完成后的消息处理，可以在这里进行后续的处理工作。34         private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)35         {36             MessageBox.Show("运算终于完成了");37         }38 39         //这里，就是后台进程开始工作时，调用工作函数的地方。你可以把你现有的处理函数写在这儿。40         private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)41         {42             work(this.backgroundWorker1);43         }44 45         //真正的处理工作46         private bool work(BackgroundWorker bk)47         {48             int tatle = 10001;49 50             for (int i = 0; i < tatle; i++)51             {52                 if (bk.CancellationPending) //这里判断一下是否用户要求取消后台进行，并可以尽早退出。53                 {54                     bk.ReportProgress(i, String.Format("当前值是 {0},操作被用户申请中断", i));55                     return false;56                 }57 58                 //处理的过程中，通过这个函数，向主线程报告处理进度，最好是折算成百分比，与外边的进度条的最大值必须要对应。这里，我没有折算，而是把界面线程的进度条最大值调整为与这里的总数一致。59                 bk.ReportProgress(i, String.Format("当前值是 {0} ", i));60             }61             return true;62         }63 64         private void button2_Click(object sender, EventArgs e)65         {66             //用户要求取消时，就这样处理一下。有时不太灵喔。67             this.backgroundWorker1.CancelAsync();68         }69 70         private void button1_Click(object sender, EventArgs e)71         {72             if (this.backgroundWorker1.IsBusy)73                 return;74             this.backgroundWorker1.RunWorkerAsync();75         }76 77         private void button3_Click(object sender, EventArgs e)78         {79             this.Close();80         }81     }82 }