【#文档大全网# 导语】以下是®文档大全网的小编为您整理的《复制功能代码》，欢迎阅读！
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.IO; namespace FileCopy {
public partial class Frm_Main : Form {
public Frm_Main() {
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e) {
openFileDialog1.FileName = "";
if (openFileDialog1.ShowDialog() == DialogResult.OK) textBox1.Text = openFileDialog1.FileName; }
private void button2_Click(object sender, EventArgs e) {
folderBrowserDialog1.SelectedPath = "";
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) textBox2.Text = folderBrowserDialog1.SelectedPath; }
private void button3_Click(object sender, EventArgs e) {
if (textBox1.Text.Length == 0 || textBox2.Text.Length == 0) MessageBox.Show("请选择原文件路径或目的文件路径。"); else
{
string tem_Dfile = textBox1.Text;
tem_Dfile = tem_Dfile.Substring(tem_Dfile.LastIndexOf("\\") + 1, tem_Dfile.Length - tem_Dfile.LastIndexOf("\\") - 1);
tem_Dfile = textBox2.Text + "\\" + tem_Dfile; CopyFile(textBox1.Text, tem_Dfile, 1024); }
}
FileStream FormerOpen; FileStream ToFileOpen;
///
/// 文件的复制 ///
/// 源文件路径 /// 目的文件路径
/// 传输大小
/// ProgressBar控件 public void CopyFile(string FormerFile, string toFile, int SectSize) {
FileStream fileToCreate = new FileStream(toFile, FileMode.Create); //创建目的文件，如果已存在将被覆盖
fileToCreate.Close(); //关闭所有资源
fileToCreate.Dispose(); //释放所有资源
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
//根据一次传输的大小，计算传输的个数 int FileSize; //要拷贝的文件的大小
//如果分段拷贝，即每次拷贝内容小于文件总长度 if (SectSize < FormerOpen.Length)
{
byte[] buffer = new byte[SectSize]; //根据传输的大小，定义一个字节数组 int copied = 0; //记录传输的大小
while (copied <= ((int)FormerOpen.Length - SectSize)) //拷贝主体部分
{
FileSize = FormerOpen.Read(buffer, 0, SectSize); //从0开始读，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; //使源文件和目的文件流的位置相同 copied += FileSize; //记录已拷贝的大小
}
int left = (int)FormerOpen.Length - copied; //获取剩余大小 FileSize = FormerOpen.Read(buffer, 0, left); //读取剩余的字节 FormerOpen.Flush(); //清空缓存
ToFileOpen.Write(buffer, 0, left); //写入剩余的部分 ToFileOpen.Flush(); //清空缓存 }
//如果整体拷贝，即每次拷贝内容大于文件总长度 else
{
byte[] buffer = new byte[FormerOpen.Length]; //获取文件的大小
FormerOpen.Read(buffer, 0, (int)FormerOpen.Length); //读取源文件的字节
FormerOpen.Flush(); //清空缓存
ToFileOpen.Write(buffer, 0, (int)FormerOpen.Length); //写放字节 ToFileOpen.Flush(); //清空缓存 }
FormerOpen.Close(); //释放所有资源 ToFileOpen.Close(); //释放所有资源 MessageBox.Show("文件复制完成"); } } }
本文来源：https://www.wddqxz.cn/ca199e262f60ddccda38a04b.html
2022-05-19
