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;
        }
    }