c\#파일 크기 에 따라 파일 복사 진행 바 인 스 턴 스 를 표시 합 니 다.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Threading;
namespace CopyProgress015
{
public partial class Form1 : Form
{
    public Form1()
    {
 InitializeComponent();
    }
    private Thread thdCopyFile; //      
    private string str = "";  //          
    FileStream FormerOpenStream;  //      FileStream 
    FileStream ToFileOpenStream;  //       FileStream 

    #region //       
    /// <summary>
    ///     
    /// </summary>
    /// <param name="FormerFile">     </param>
    /// <param name="ToFile">      </param>
    /// <param name="TranSize">    </param>
    /// <param name="progressBar1">ProgressBar  </param>
    public void CopyFile(string FormerFile, string ToFile, int TranSize, ProgressBar progressBar1)
    {
 progressBar1.Value = 0;//           0
 progressBar1.Minimum = 0; //          0
 try
 {
     FormerOpenStream = new FileStream(FormerFile, FileMode.Open, FileAccess.Read);//          
 }
 catch (IOException ex)
 {
     MessageBox.Show(ex.Message);
     return;
 }
 try
 {
     FileStream fileToCreate = new FileStream(ToFile, FileMode.Create); //      ，         
     fileToCreate.Close();//    fileToCreate   
     fileToCreate.Dispose();//    fileToCreate   
 }
 catch(IOException ex)
 {
     MessageBox.Show(ex.Message);
     return;
 }

       ToFileOpenStream = new FileStream(ToFile, FileMode.Append, FileAccess.Write);//          

       int max = Convert.ToInt32(Math.Ceiling((Double)FormerOpenStream.Length / (Double)TranSize));//         ，        . Math.Ceiling    (Double),                      。
 progressBar1.Maximum = max;//         
 int FileSize; //           
 if (TranSize < FormerOpenStream.Length)  //      ，              
 {
     byte[] buffer = new byte[TranSize]; //       ，        ，         
     int copied = 0;//       
     int tem_n = 1;//             
     while (copied <= ((int)FormerOpenStream.Length - TranSize))
     {
  FileSize = FormerOpenStream.Read(buffer, 0, TranSize);// 0    buffer     ，     TranSize
  FormerOpenStream.Flush();   //    
  ToFileOpenStream.Write(buffer, 0, TranSize); //         
  ToFileOpenStream.Flush();//    
  ToFileOpenStream.Position = FormerOpenStream.Position; //               
  copied += FileSize; //         
  progressBar1.Value = progressBar1.Value + tem_n; //         
     }
     int leftSize = (int)FormerOpenStream.Length - copied; //         
     FileSize = FormerOpenStream.Read(buffer, 0, leftSize); //       
     FormerOpenStream.Flush();
     ToFileOpenStream.Write(buffer, 0, leftSize); //       
     ToFileOpenStream.Flush();
 }
 else //      ，              
 {
     byte[] buffer = new byte[FormerOpenStream.Length];
     FormerOpenStream.Read(buffer, 0, (int)FormerOpenStream.Length);
     FormerOpenStream.Flush();
     ToFileOpenStream.Write(buffer, 0, (int)FormerOpenStream.Length);
     ToFileOpenStream.Flush();
 }
 FormerOpenStream.Close();
 ToFileOpenStream.Close();
 if (MessageBox.Show("copy finished") == DialogResult.OK)
 {
     progressBar1.Value = 0;
     txtOriginalFile.Clear();
     txtCopyFile.Clear();
     str = "";
 }
    }
    #endregion
 
    public delegate void CopyFile_Delegate(); //    /    
    /// <summary>
    ///         （        ）
    /// </summary>
    public void SetCopyFile()
    {
 //this.Invoke(new CopyFile_Delegate(RunCopyFile)); //          
 //              
 CopyFile_Delegate copyfile_delegate = new CopyFile_Delegate(RunCopyFile); //  delegate  
 this.Invoke(copyfile_delegate); //  delegate            
    }

    /// <summary>
    ///     ，  copy  ，    CopyFile_Delegate             
    /// </summary>
    public void RunCopyFile()
    {
 CopyFile(txtOriginalFile.Text, txtCopyFile.Text + "\\" + str, 1024, progressBar1); //    
 Thread.Sleep(0); //     
 thdCopyFile.Abort();  //    
    }

    private void btnOriginalFile_Click(object sender, EventArgs e)
    {
 if (openFileDialog1.ShowDialog() == DialogResult.OK)  //       
 {
     txtOriginalFile.Text = openFileDialog1.FileName;  //        
 }
    }
    private void btnCopyFile_Click(object sender, EventArgs e)
    {
 if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
 {
     txtCopyFile.Text = folderBrowserDialog1.SelectedPath;//                        
 }
    }

    private void btnBeginToCopy_Click(object sender, EventArgs e)
    {                    

 if (txtOriginalFile.Text.Trim() == string.Empty)
 {
     MessageBox.Show("OriginalFile cannot be empty!");
     return;

 }
 else
 {
     str = txtOriginalFile.Text;//        
     str = str.Substring(str.LastIndexOf('\\') + 1, str.Length - str.LastIndexOf('\\') - 1); //        
 }

 if (txtCopyFile.Text.Trim() == string.Empty)
 {
     MessageBox.Show("The Copyfile path cannot be empty!");
     return;
 }
 else
 {
     thdCopyFile = new Thread(new ThreadStart(SetCopyFile));
     thdCopyFile.Start();
 }             

    }

    /// <summary>
    ///  textbox  tooltip
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void txtOriginalFile_MouseHover(object sender, EventArgs e)
    {
 ToolTip tooltip = new ToolTip();
 if (txtOriginalFile.Text.Trim() != string.Empty)
 {

     tooltip.Show(txtOriginalFile.Text, txtOriginalFile);
 }
 else
 {
     tooltip.Hide(txtOriginalFile);
 }

    }
    /// <summary>
    ///  textbox  tooltip
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void txtCopyFile_MouseHover(object sender, EventArgs e)
    {
 ToolTip tooltip = new ToolTip();
 if (txtCopyFile.Text.Trim() != string.Empty)
 {

     tooltip.Show(txtCopyFile.Text, txtCopyFile);
 }
 else
 {
     tooltip.Hide(txtCopyFile); 
 }
    }
}
}