C#.NET中使用BackgroundWorker在模态对话框中显示进度条

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace ModalProgressDialog
{
    public partial class Form1 : Form
    {
        protected BackgroundWorker worker = new BackgroundWorker();
        protected Form2 frm = new Form2();

        public Form1()
        {
            worker.DoWork += new DoWorkEventHandler(worker_DoWork);
            worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
            worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);

            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            worker.WorkerReportsProgress = true;            
            worker.RunWorkerAsync();
            frm.ShowDialog();
        }

        void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            frm.Close();
            MessageBox.Show("Done");
        }

        void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            frm.ProgressValue = e.ProgressPercentage;
        }

        void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            CountTheTime();
        }

        private void CountTheTime()
        {
            int initialValue = 100; 
            for (int count = 0; count < initialValue; count = count + 2) 
            { 
                Thread.Sleep(1000);
                worker.ReportProgress(count); 
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ModalProgressDialog
{
    public partial class Form2 : Form
    {
        public int ProgressValue 
        {
            get { return this.progressBar1.Value; }
            set { progressBar1.Value = value; }
        }

        public Form2()
        {
            InitializeComponent();
        }
    }
}