winform控件抢占UI主线程的问题

Question

各位，以下代码实现的是从Y文件夹复制bmp文件到YTest文件夹。
而复制的过程中会实时的通过progressbar展现，功能上没有什么不正确，但效果上有点小问题。
当文件数目过大时，progressBar1.PerformStep();会占用到UI主线程，导致看着有点卡，或者说有点像死了的感觉。
是不是通过多线程能解决此问题呢，希望各位大牛不吝赐教，感激不尽啊！
            progressBar1.Visible = true;
            string directorySource = Application.StartupPath + "\\Y";
            string directoryDest = Application.StartupPath + "\\YTest";
            string[] filePathSource = Directory.GetFiles(directorySource, "*.bmp");
            string[] filePathDest = Directory.GetFiles(directoryDest);            progressBar1.Minimum = 1;
            progressBar1.Maximum = filePathSource.Length;
            if (filePathDest.Length > 0)
            {
                for (int i = 0; i < filePathDest.Length; i++)
                {
                    File.Delete(filePathDest[i]);
                }
            }
            for (int i = 0; i < filePathSource.Length; i++)
            {
                File.Copy(filePathSource[i],
                    directoryDest + "\\" + Path.GetFileNameWithoutExtension(filePathSource[i]) + ".bmp");
                progressBar1.PerformStep();
                Console.WriteLine(i);
            }
            progressBar1.Visible = false;

Answer 1

上面代码太难看了，换个：progressBar1.Visible = true;
            string directorySource = Application.StartupPath + "\\Y";
            string directoryDest = Application.StartupPath + "\\YTest";
            string[] filePathSource = Directory.GetFiles(directorySource,
                "*.bmp");
            string[] filePathDest = Directory.GetFiles(directoryDest);            progressBar1.Minimum = 1;
            progressBar1.Maximum = filePathSource.Length;
            if (filePathDest.Length > 0)
            {
                for (int i = 0; i < filePathDest.Length; i++)
                {
                    File.Delete(filePathDest[i]);
                }
            }
            for (int i = 0; i < filePathSource.Length; i++)
            {
                File.Copy(filePathSource[i],
                    directoryDest + "\\" + Path.GetFileNameWithoutExtension(
                    filePathSource[i]) + ".bmp");
                progressBar1.PerformStep();
                Console.WriteLine(i);
            }
            progressBar1.Visible = false;

Answer 2

   private void DoWithCommon()
        {
            WaitCallback waitCallBack = new WaitCallback(this.InvokeMethod);
            ThreadPool.QueueUserWorkItem(waitCallBack, "Knights Warrior");
        }
        private void InvokeMethod(object x)
        {
            this.Invoke(new InvokeMethodDelegate(this.ChangeUIWithCommon), x.ToString());
        }
        private void ChangeUIWithCommon(string name)
        {
            this.lblMessage.Text = name;
        }在线程中修改UI控件

Answer 3

this.Invoke(new InvokeMethodDelegate(this.ChangeUIWithCommon), x.ToString());
关键

Answer 4

用backgroundwork控件。
在progressindexchange事件中设置progressBar1的value

Answer 5

every day,I will get the score

Answer 6

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 WindowsFormsApplication9
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public delegate void InvokeMethodDelegate(string name);
        
        private void button1_Click(object sender, EventArgs e)
        {
            DoWithCommon();
        }        private void DoWithCommon()
        {
            WaitCallback waitCallBack = new WaitCallback(this.InvokeMethod);
            ThreadPool.QueueUserWorkItem(waitCallBack, "Knights Warrior");
        }
        private void InvokeMethod(object x)
        {
            this.Invoke(new InvokeMethodDelegate(this.ChangeUIWithCommon), x.ToString());
        }
        private void ChangeUIWithCommon(string name)
        {
            this.button1.Text = name;
        }    }
}

Answer 7

 private void InvokeMethod(object x)
        {
            for (int i = 0; i < filePathSource.Length; i++)
            {
                File.Copy(filePathSource[i],
                    directoryDest + "\\" + Path.GetFileNameWithoutExtension(
                    filePathSource[i]) + ".bmp");
                               Console.WriteLine(i);
                   this.Invoke(new InvokeMethodDelegate(this.ChangeUIWithCommon));            }                   }
        private void ChangeUIWithCommon()
        {
             progressBar1.PerformStep();
        }