C# 学习黑马.Net视频教程，大文件拷贝
2020-12-13 15:05
标签：style blog http io color ar os 使用 for 设计器代码： 代码： C# 学习黑马.Net视频教程，大文件拷贝 标签：style blog http io color ar os 使用 for 原文地址：http://www.cnblogs.com/han1982/p/4070360.html
namespace 大文件拷贝
{
partial class Form1
{
///
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace 大文件拷贝
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private string _fileName;
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
this.textBox1.Text = ofd.FileName;
_fileName = ofd.SafeFileName;
}
}
private void button2_Click(object sender, EventArgs e)
{
FolderBrowserDialog fbd = new FolderBrowserDialog();
if (fbd.ShowDialog() == DialogResult.OK)
{
this.textBox2.Text = fbd.SelectedPath;
}
}
private void button3_Click(object sender, EventArgs e)
{
this.progressBar1.Value = 0;
this.label1.Text = "0%";
if (!File.Exists(this.textBox1.Text))
{
MessageBox.Show("找不到目标文件！");
return;
}
if (!Directory.Exists(this.textBox2.Text))
{
MessageBox.Show("请选择有效的保存路径！");
return;
}
string fileRead = this.textBox1.Text;
string fileSave = this.textBox2.Text + "/" + _fileName;
System.Threading.ThreadPool.QueueUserWorkItem((o) =>
{
using (IDisposable file = new FileStream(fileRead, FileMode.Open, FileAccess.Read),
fileWrite = new FileStream(fileSave, FileMode.Create, FileAccess.Write))
{
int count = 0;
long fileLength = ((FileStream)file).Length; //目标文件大小
double n = (100 * 1.0 / fileLength); //每次进度条累加
double m = 0; //累加统计
int spam = 1; //时间间隔
double speed = 0; //拷贝速度
do
{
DateTime time = DateTime.Now;
count = ((FileStream)file).ReadByte();
((FileStream)fileWrite).WriteByte((byte)count);//按一个字节一个字节写入
//计算速度 单位k/s
speed = (1.0 * 1000 / 1024) / spam;
//进度条
m = m + n;
//控件显示
ShowProbar(o, m, speed);
//保存时间间隔，单位毫秒
spam = (DateTime.Now - time).Milliseconds > 0 ? (DateTime.Now - time).Milliseconds : spam;//必须大于0
} while (count != -1);
}
if (this.progressBar1.Value == 100)
{
System.Threading.Thread.Sleep(1000); //延迟1秒弹出
MessageBox.Show("拷贝成功！");
}
});
}
private void button4_Click(object sender, EventArgs e)
{
this.progressBar1.Value = 0;
this.label1.Text = "0%";
if (!File.Exists(this.textBox1.Text))
{
MessageBox.Show("找不到目标文件！");
return;
}
if (!Directory.Exists(this.textBox2.Text))
{
MessageBox.Show("请选择有效的保存路径！");
return;
}
string fileRead = this.textBox1.Text;
string fileSave = Path.Combine(this.textBox2.Text, _fileName);
System.Threading.ThreadPool.QueueUserWorkItem((o) =>
{
using (IDisposable file = new FileStream(fileRead, FileMode.Open, FileAccess.Read),
fileWrite = new FileStream(fileSave, FileMode.Create, FileAccess.Write))
{
int count = 0;
long fileLength =((FileStream)file).Length; //目标文件大小
//根据目标文件大小创建byte数组长度
byte[] data = new byte[fileLength > 1024 * 1024 * 30 ? 1024 * 1024 * 30 : fileLength]; //30M 1024 * 1024 * 30
int step = (int)Math.Ceiling(fileLength * 1.0 / data.Length); //分流段数
double n = (100 * 1.0 / step); //每次进度条累加
double m = 0; //累加统计
int spam = 1; //时间间隔
double speed = 0; //拷贝速度
do
{
DateTime time = DateTime.Now;
//文件流操作
count = ((FileStream)file).Read(data, 0, data.Length);
((FileStream)fileWrite).Write(data, 0, count);
//保存时间间隔，单位毫秒
spam = (DateTime.Now - time).Milliseconds > 0 ? (DateTime.Now - time).Milliseconds : spam;//必须大于0
//计算速度 单位k/s
if (count == data.Length)
{
speed = (count * 1.0 / 1024 / spam) * 1000;
}
//进度条
m = m + n;
//控件显示
ShowProbar(o, m, speed);
} while (count > 0);
}
if (this.progressBar1.Value == 100)
{
System.Threading.Thread.Sleep(1000); //延迟1秒弹出
MessageBox.Show("拷贝成功！");
}
});
}
private void ShowProbar(object o, double m, double speed)
{
try
{
int barValue = (int)Math.Floor(m) >= 100 ? 100 : (int)Math.Floor(m);
this.Invoke(new System.Threading.WaitCallback((a) =>
{
this.progressBar1.Value = barValue;
this.label1.Text = barValue.ToString() + "%";
this.label2.Text = speed > 1024 ? (speed / 1024).ToString("0.0m/s") : (speed >= 1 ? speed.ToString("0k/s") : (speed * 1024).ToString("0b/s"));
}), o);
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
}
}