C#:复制文件显示进度条

1.窗口界面
主要是文本框textBox、按钮button、进度条prograssBar三大组件所组成的。

2.完整代码

using System;
using System.IO;
using System.Windows.Forms;
using System.Threading;//线程序的命名空间
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace 复制文件显示进度
{
    public partial class FileCopyPlan : Form
    {
        public FileCopyPlan()
        {
            InitializeComponent();
        }
        private Thread thdCopyFile; //创建一个线程
        private string str = "";  //用来记录源文件的名字
        FileStream FormerOpen;  //实例化源文件FileStream类
        FileStream ToFileOpen;  //实例化目标文件FileStream类

        public void CopyFile(string FormerFile, string ToFile, int SectSize, 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

            //创建目的文件，如果已存在将被覆盖
            FileStream fileToCreate = new FileStream(ToFile, FileMode.Create);
            fileToCreate.Close();  //关闭所有fileToCreate的资源
            fileToCreate.Dispose();//释放所有fileToCreate的资源

            FormerOpen = new FileStream(FormerFile, FileMode.Open, FileAccess.Read);//以只读方式打开源文件
            ToFileOpen = new FileStream(ToFile, FileMode.Append, FileAccess.Write); //以写方式打开目的文件

            int max = Convert.ToInt32(Math.Ceiling((double)FormerOpen.Length / (double)SectSize));
            progressBar1.Maximum = max;
            int FileSize;

            if (SectSize <= FormerOpen.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[SectSize]; //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)FormerOpen.Length - SectSize))
                {
                    FileSize = FormerOpen.Read(buffer, 0, SectSize);//从0开始读到buffer字节数组中，每次最大读SectSize
                    FormerOpen.Flush(); //清空缓存
                    ToFileOpen.Write(buffer, 0, SectSize);     //向目的文件写入字节
                    ToFileOpen.Flush(); //清空缓存
                    ToFileOpen.Position = FormerOpen.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)FormerOpen.Length - copied; //获取剩余文件的大小
                FileSize = FormerOpen.Read(buffer, 0, leftSize);//读取剩余的字节
                FormerOpen.Flush();
                ToFileOpen.Write(buffer, 0, leftSize);          //写入剩余的部分
                ToFileOpen.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[FormerOpen.Length];        //获取文件大小
                FormerOpen.Read(buffer, 0, (int)FormerOpen.Length); //获取源文件大小
                FormerOpen.Flush();                                 //清空缓存
                ToFileOpen.Write(buffer, 0, (int)FormerOpen.Length);//写入字节
                ToFileOpen.Flush();                                 //清空缓存

            }

            FormerOpen.Close();//释放所有资源
            ToFileOpen.Close();//释放所有资源

            if (MessageBox.Show("复制完成") == DialogResult.OK)
            {
                progressBar1.Value = 0;//设置进度条当前位置为0
                textBox1.Clear();//清空文本
                textBox2.Clear();//清空文本
                str = "";
            }
        }

        public delegate void CopyFile_Delegate(); //定义委托/托管线程

        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           
        }

        public void RunCopyFile()
        {
            CopyFile(textBox1.Text, textBox2.Text + "\\" + str, 1024, progressBar1); //复制文件
            Thread.Sleep(0); //避免假死
            thdCopyFile.Abort();  //关闭线程
        }

        private void button1_Click(object sender, EventArgs e)//“源文件”按钮
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)  //打开文件对话框
            {
                textBox1.Text = openFileDialog1.FileName;  //获取源文件的路径
            }
        }

        private void button2_Click(object sender, EventArgs e)//“目的文件”按钮
        {
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                textBox2.Text = folderBrowserDialog1.SelectedPath;//获取目的文件的路径              
            }
        }

        private void botton3_Click(object sender, EventArgs e)//“复制”按钮
        {
            if (textBox1.Text.Trim() == string.Empty)
            {
                MessageBox.Show("OriginalFile cannot be empty!");
                return;
            }
            else
            {
                str = textBox1.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 (textBox2.Text.Trim() == string.Empty)
            {
                MessageBox.Show("The Copyfile path cannot be empty!");
                return;
            }
            else
            {
                thdCopyFile = new Thread(new ThreadStart(SetCopyFile));
                thdCopyFile.Start();
            }
        }

        private void textBox1_MouseHover(object sender, EventArgs e)//源文件文本框事件
        {
            ToolTip tooltip = new ToolTip();
            if (textBox1.Text.Trim() != string.Empty)
            {
                tooltip.Show(textBox1.Text, textBox1);
            }
            else
            {
                tooltip.Hide(textBox1);
            }
        }

        private void textBox2_MouseHover(object sender, EventArgs e)//目的文件文本框事件
        {
            ToolTip tooltip = new ToolTip();
            if (textBox2.Text.Trim() != string.Empty)
            {
                tooltip.Show(textBox2.Text, textBox2);
            }
            else
            {
                tooltip.Hide(textBox2);
            }
        }
    }
}