以下是该下载类
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Web;
using System.Net;
//
//luyugao.com
//
namespace 自动升级
{
class HttpDF
{
private long fileLength;
private long downLength;//已经下载文件大小，外面想用就改成公共属性
private static bool stopDown;
public string HttpDownLoad()
{
fileLength = 0;
downLength = 0;
stopDown = false;
//
// TODO: 在此处添加构造函数逻辑
//
return "";
}
/// <summary>
/// 文件下载
/// </summary>
/// <param name= "url "> 连接 </param>
/// <param name= "fileName "> 本地保存文件名 </param>
/// <param name= "progressBar "> 进度条 </param>
public void httpDownFile(string url, string fileName, ProgressBar progressBar)
{
Label lable = new Label();
httpDownFile(url, fileName, progressBar, lable);
lable.Dispose();
}
/// <summary>
/// 文件下载
/// </summary>
/// <param name= "url "> 连接 </param>
/// <param name= "fileName "> 本地保存文件名 </param>
/// <param name= "progressBar "> 进度条 </param>
/// <param name= "label "> 返回已经下载的百分比 </param>
public string httpDownFile(string url, string fileName, ProgressBar progressBar, Label label)
{
string strState = "No";
stopDown = false;
Stream str = null, fs = null;
try
{
//获取下载文件长度
fileLength = getDownLength(url);
downLength = 0;
if (fileLength > 0)
{
WebClient DownFile = new WebClient();
str = DownFile.OpenRead(url);
//判断并建立文件
if (createFile(fileName))
{
byte[] mbyte = new byte[1024];
int readL = str.Read(mbyte, 0, 1024);
fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write);
//读取流
while (readL != 0)
{
if (stopDown)
break;
downLength += readL;//已经下载大小
fs.Write(mbyte, 0, readL);//写文件
readL = str.Read(mbyte, 0, 1024);//读流
//progressBar.Value = (int)(downLength * 100 / fileLength);
//label.Text = progressBar.Value.ToString() + "% ";
progressBar.Value = (int)(downLength * 100 / fileLength);
double p = (double)(downLength * 100) / (double)fileLength;
p = Math.Round(Convert.ToDouble(p), 1, MidpointRounding.AwayFromZero);
label.Text = p.ToString() + "% ";
Application.DoEvents();
strState = "OK";
}
str.Close();
fs.Close();
}
}
}
catch (Exception)
{
if (str != null)
str.Close();
if (fs != null)
fs.Close();
}
return strState;
}
/// <summary>
/// 文件下载
/// </summary>
/// <param name= "url "> 连接 </param>
/// <param name= "fileName "> 本地保存文件名 </param>
public void httpDownFile(string url, string fileName)
{
try
{
WebClient DownFile = new WebClient();
DownFile.DownloadFile(url, fileName);
}
catch
{
}
}
/// <summary>
/// 获取下载文件大小
/// </summary>
/// <param name= "url "> 连接 </param>
/// <returns> 文件长度 </returns>
private long getDownLength(string url)
{
try
{
WebRequest wrq = WebRequest.Create(url);
WebResponse wrp = (WebResponse)wrq.GetResponse();
wrp.Close();
return wrp.ContentLength;
}
catch
{
return 0;
}
}
/// <summary>
/// 建立文件(文件如已经存在，删除重建)
/// </summary>
/// <param name= "fileName "> 文件全名(包括保存目录) </param>
/// <returns> </returns>
private bool createFile(string fileName)
{
try
{
if (!Directory.Exists(Path.GetDirectoryName(fileName)))//判断目标文件的文件夹是否存在
Directory.CreateDirectory(Path.GetDirectoryName(fileName));//循环创建
if (File.Exists(fileName))
File.Delete(fileName);
Stream s = File.Create(fileName);
s.Close();
return true;
}
catch
{
return false;
}
}
/// <summary>
/// 停止下载
/// </summary>
public void downClose()
{
stopDown = true;
}
}
}来看怎么使用，以下代码可以放在循环体重进行循环下载
HttpDF df = new HttpDF(); string s = df.httpDownFile(网页文件地址, 本地保存路径, ProgressBar, Label); df.downClose();
其中后两个参数是用来显示下载进度的，试试看，在软件升级的时候肯定用得到~！