c# BackgroundWorker初试

/*

 * Created by SharpDevelop.

 * User: Administrator

 * Date: 2017/7/31

 * Time: 16:18

 *

 * To change this template use Tools | Options | Coding | Edit Standard Headers.

 */

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Windows.Forms;

using System.Threading;

using System.ComponentModel;

namespace App

{

    /// <summary>

    /// Description of MainForm.

    /// </summary>

    public partial class MainForm : Form

    {

        private BackgroundWorker bw;

        public MainForm()

        {

            //

            // The InitializeComponent() call is required for Windows Forms designer support.

            //

            InitializeComponent();

            //

            // TODO: Add constructor code after the InitializeComponent() call.

            //

        }

        void process1_Exited(object sender, EventArgs e)

        {

            // TODO: Implement process1_Exited

        }

        private void MainForm_Load(object sender, EventArgs e)

        {

        }

        void button1_Click(object sender, EventArgs e)

        {

            bw = new BackgroundWorker();

            bw.WorkerReportsProgress = true;

            bw.WorkerSupportsCancellation = true;

            bw.DoWork += DoWork;

            bw.RunWorkerCompleted += RunWorkerComplated;

            bw.ProgressChanged += UpdateButtonText;

            bw.RunWorkerAsync();

        }

        void RunWorkerComplated(object sender, RunWorkerCompletedEventArgs e)

        {

            MessageBox.Show("ok");

        }

        void DoWork(object sender, DoWorkEventArgs e)

        {

            for (int i = ; i <= ; i++)

            {

                (sender as BackgroundWorker).ReportProgress(i);

                label1.Text = i.ToString();

                Thread.Sleep();

            }

        }

        void UpdateButtonText(object sender, ProgressChangedEventArgs e)

        {

            button2.Text = e.ProgressPercentage.ToString();

        }

    }

}