C# 多线程复制文件并显示进度条的代码

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;
using System.IO;

namespace WindowsFormsApplication2
{

/// <summary>
    /// date:2012年3月2日17
    /// author:Ryan.wan
    /// </summary>
    public partial class Form1 : Form
    {
        private Thread threadcount; //定义线程
        delegate void setpro(int count,int index); //定义委托
        setpro SetPro;
        private event EventHandler sucevent; //事件
        int index = 0;
        int count = 0;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SetPro = new setpro(changepar);
            threadcount = new Thread(new ThreadStart(run));
            threadcount.IsBackground = true;
            threadcount.Start();
            sucevent += new EventHandler(Form1_sucevent);
        }
        private void changepar(int count1,int value)
        {
            this.progressBar1.Maximum = count1;
            this.progressBar1.Value = value;
            if (this.progressBar1.Value == this.progressBar1.Maximum)
            {
                sucevent(this, new EventArgs());
            }
        }

        private void run()
        {
            String[] strpath = Directory.GetFiles("D:work111");
            count = strpath.Length;
            for (int i = 0; i < strpath.Length; i++)
            {
                if (File.Exists(strpath[i].Replace("111", "222")))
                {
                    File.Delete(strpath[i].Replace("111", "222"));
                }
                File.Copy(strpath[i], strpath[i].Replace("111", "222"));
                index = i + 1;
                this.progressBar1.Invoke(SetPro, new object[] { count, index });
            }
        }

        void Form1_sucevent(object sender, EventArgs e)
        {
            threadcount.Abort();
            MessageBox.Show("完成了");
        }
    }
}