BackgroundWorker worker = new BackgroundWorker();//定义后台进程

            worker.WorkerReportsProgress = true;//允许报告进度

            worker.WorkerSupportsCancellation = true;//允许中途取消

            worker.DoWork += new DoWorkEventHandler(DoWork);//注册后台工作事件

            worker.ProgressChanged += new ProgressChangedEventHandler(OnProgressChanged);//注册进度报告事件

            worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(OnProcessCompleted);//注册工作完成事件

            if(!worker.IsBusy)

            {

                worker.RunWorkerAsync();//开始异步工作

            }

 #region 配置后台进程事件

        private void DoWork(object sender, DoWorkEventArgs e)

        {//定义后台工作

        }

        private void OnProgressChanged(object sender, ProgressChangedEventArgs e)

        {//定义进度报告事件

        }

        //工作完成后执行的事件

        private void OnProcessCompleted(object sender, RunWorkerCompletedEventArgs e)

        {//定义工作完成事件

        }

        #endregion