C#实现带进度条的文件复制功能

C#实现带进度条的文件复制功能

本文将介绍如何使用C#实现一个带有进度条的文件复制功能。通过本文，读者可以学习到如何使用线程、进度条控件以及文件流操作等技术。

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; //创建一个线程  
private string str = ""; //用来记录源文件的名字  
FileStream FormerOpenStream; //实例化源文件FileStream类  
FileStream ToFileOpenStream; //实例化目标文件FileStream类

#region //复制文件 函数  
/// <summary>  
/// 复制文件  
/// </summary>  
/// <param name="FormerFile">源文件路径</param>  
/// <param name="ToFile">目的文件路径</param>  
/// <param name="TranSize">传输大小</param>  
/// <param name="progressBar1">ProgressBar控件</param>  
public void CopyFile(string FormerFile, string ToFile, int TranSize, ProgressBar progressBar1)  
{  
progressBar1.Value = 0;//设置进度条的当前位置为0  
progressBar1.Minimum = 0; //设置进度条的最小值为0

try  
{  
FormerOpenStream = new FileStream(FormerFile, FileMode.Open, FileAccess.Read);//以只读方式打开源文件  
}  
catch (IOException ex)  
{  
MessageBox.Show(ex.Message);  
return;  
}

try  
{  
FileStream fileToCreate = new FileStream(ToFile, FileMode.Create); //创建目的文件，如果已存在将被覆盖  
fileToCreate.Close();//关闭所有fileToCreate的资源  
fileToCreate.Dispose();//释放所有fileToCreate的资源  
}  
catch(IOException ex)  
{  
MessageBox.Show(ex.Message);  
return;  
}

ToFileOpenStream = new FileStream(ToFile, FileMode.Append, FileAccess.Write);//以写方式打开目的文件

int max = Convert.ToInt32(Math.Ceiling((Double)FormerOpenStream.Length / (Double)TranSize));//根据一次传输的大小，计算最大传输个数. Math.Ceiling 方法 (Double),返回大于或等于指定的双精度浮点数的最小整数值。

progressBar1.Maximum = max;//设置进度条的最大值  
int FileSize; //每次要拷贝的文件的大小  
if (TranSize < FormerOpenStream.Length) //如果分段拷贝，即每次拷贝内容小于文件总长度  
{  
byte[] buffer = new byte[TranSize]; //根据传输的大小，定义一个字节数组，用来存储传输的字节  
int copied = 0;//记录传输的大小  
int tem_n = 1;//设置进度栏中进度的增加个数  
while (copied <= ((int)FormerOpenStream.Length - TranSize))  
{  
FileSize = FormerOpenStream.Read(buffer, 0, TranSize);//从0开始读到buffer字节数组中，每次最大读TranSize  
FormerOpenStream.Flush(); //清空缓存  
ToFileOpenStream.Write(buffer, 0, TranSize); //向目的文件写入字节  
ToFileOpenStream.Flush();//清空缓存  
ToFileOpenStream.Position = FormerOpenStream.Position; //是源文件的目的文件流的位置相同  
copied += FileSize; //记录已经拷贝的大小  
progressBar1.Value = progressBar1.Value + tem_n; //增加进度栏的进度块  
}  
int leftSize = (int)FormerOpenStream.Length - copied; //获取剩余文件的大小  
FileSize = FormerOpenStream.Read(buffer, 0, leftSize); //读取剩余的字节  
FormerOpenStream.Flush();  
ToFileOpenStream.Write(buffer, 0, leftSize); //写入剩余的部分  
ToFileOpenStream.Flush();  
}  
else //如果整体拷贝，即每次拷贝内容大于文件总长度  
{  
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(); //定义委托/托管线程  
/// <summary>  
/// 在线程上执行委托（设置托管线程函数）  
/// </summary>  
public void SetCopyFile()  
{  
//this.Invoke(new CopyFile_Delegate(RunCopyFile)); //对指定的线程进行托管  
//下面两行代码等同上面一行代码  
CopyFile_Delegate copyfile_delegate = new CopyFile_Delegate(RunCopyFile); //创建delegate对象  
this.Invoke(copyfile_delegate); //调用delegate  
}

/// <summary>  
/// 设置线程，运行copy文件，它与代理CopyFile_Delegate应具有相同的参数和返回类型  
/// </summary>  
public void RunCopyFile()  
{  
CopyFile(txtOriginalFile.Text, txtCopyFile.Text + "\\\\" + str, 1024, progressBar1); //复制文件  
Thread.Sleep(0); //避免假死  
thdCopyFile.Abort(); //关闭线程

}

private void btnOriginalFile_Click(object sender, EventArgs e)  
{  
if (openFileDialog1.ShowDialog() == DialogResult.OK) //打开文件对话框  
{  
txtOriginalFile.Text = openFileDialog1.FileName; //获取源文件的路径  
}

}

private void btnCopyFile_Click(object sender, EventArgs e)  
{  
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)  
{  
txtCopyFile.Text = folderBrowserDialog1.SelectedPath;//获取目的文件的路径  
}  
}

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;//记录源文件的路径  
str = str.Substring(str.LastIndexOf('\\\\') + 1, str.Length - str.LastIndexOf('\\\\') - 1); //获取源文件的名称  
}

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>  
/// 给textbox增加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>  
/// 给textbox增加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);  
}

}

}  
}