backgroundworker使用 实现进度条ProgressBar

///.net Framework 2.0版本以上支持此控件 ///命名空间： System.ComponentModel ///此控件一般是用来实现“多线程”操作，解决了UI界面处于停止响应的状态。 ///此控件可以视图支持，也可以像编程那样来创建它 BackgroundWorker worker = new BackgroundWorer(); ///注意几个重要的事件处理程序(Event)： ///事件处理程序 DoWorkEventHandler(object sender , DoWorkerEventArgs e); ///若要收到进度更新通知,请使用 ProgressChangedEventHandler(object sender , ProgressChangedEventArgs e); ///若要在操作完成时收到通知,请使用 RunWorkerCompletedeventHandler(object sender , RunWorkerEventArgs e); //加两个方法(Method): ///开始执行后台操作 RrunWorkerAsync(); ///请求取消挂起的后台操作 CancelAsync(); ///// 功能 backgroundworder + progressbar 控件实现进度条功能 /// button1_Click private void button1_Click(object sender, EventArgs e) { Form2 F2 = new Form2(); F2.Show(); //这里使用的是拖动控件形式来实现。也可以用创建形式来实现 ///添加一个事件处理程序 this.backgroundworker1.DoWorker += new DoWorkerEventHandler(DoWorker); ///再添加一个事件处理程序（这里是实现您的功能，我这里是向数据库里添加数据） this.backgroudworker1.DoWorker += DoWorkerEventHandler(InsertDataWorker); ///添加一个显示进度条的事件 this.backgroundworker.ProgressChanged += new ProgressEventHandler(F2.ProgressChanged); //F2.ProgressChanged 是显示进度条Method ///后台已操作完成，关闭F2窗体 this.backgroundworker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(F2.CloseForm); // F2.CloseForm()调用关闭F2窗体 ///开始执行后台操作 this.backgroundworker.RunWorkerAsyuc(); } /// private void DoWorker(object sender , DoWorkEvnetArgs e) { e.Result = (WorkTimer(this.backgroundworker1,e)); } /////// 这里写您要实现的功能，我这里是向数据库添加数据 private void InsertDataWork(object sender , DoWorkEventArgs e) { // do some... } /// <summary> /// 设置进度条显示长度 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> /// PCount 是设置F2窗体里的progressbar控件里的Maximum的值 private int WorkTimer(object sender, DoWorkEventArgs e) { for (int i = 0; i < PCount; i++) { if (this.backgroundWorker1.CancellationPending) { e.Cancel = true; return -1; } else { this.backgroundWorker1.ReportProgress(i); } /// 将当前线程挂起指定的时间 System.Threading.Thread.Sleep(100); } return -1; } ////Form2里代码 public partial class Form2 : Form { public ProgressbarForm() { InitializeComponent(); } /// <summary> /// 关闭进度条显示窗体 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> public void CloseForm(object sender, RunWorkerCompletedEventArgs e) { this.Close(); } /// <summary> /// 显示进度条 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> public void ProgessChanged(object sender, ProgressChangedEventArgs e) { this.progressBar1.Style = ProgressBarStyle.Continuous; this.progressBar1.Value = e.ProgressPercentage; } }