很奇怪 微软都做了些什么?

王朝other·作者佚名  2006-01-10
窄屏简体版  字體: |||超大  

前些天8月以前文件下载还能用,最近做了几次windows更新就挂了!!!!!!!!

微软你到底做了些什么??????

文件下载的代码如下:

using System;

using System.Web;

using System.Web.UI;

using System.IO;

using System.Threading;

namespace FileDownLoad4Net

{

/// <summary>

/// FileDown 的摘要说明。

/// </summary>

public class FileDown

{

private string m_strFullPath;

private long m_lSpeed;

private int m_iFactDownSpeed;

private string m_strFileName;

/// <summary>

/// 下载页显示文件名

/// </summary>

public string FileName

{

get{return m_strFileName;}

set{m_strFileName = value;}

}

/// <summary>

/// 带文件名下载路径

/// </summary>

public string FullPath

{

get{return m_strFullPath;}

set{m_strFullPath = value;}

}

/// <summary>

/// 每秒允许下载的字节数

/// </summary>

public long Speed

{

get{return m_lSpeed;}

set{m_lSpeed = value;}

}

/// <summary>

/// 实际下载速度

/// </summary>

public int FactDownSpeed

{

get{return m_iFactDownSpeed;}

set{m_iFactDownSpeed = value;}

}

/// <summary>

/// 表示一个下载

/// </summary>

public FileDown()

{

//

// TODO: 在此处添加构造函数逻辑

//

}

/// <summary>

/// 开始下载文件

/// </summary>

/// <returns></returns>

public bool DownFile()

{

return DownFile(this.FileName,this.FullPath,this.Speed);

}

/// <summary>

/// 开始下载文件

/// </summary>

/// <param name="p_strFileName">下载页显示文件名</param>

/// <param name="p_strFullPath">带文件名下载路径</param>

/// <param name="p_lSpeed">每秒允许下载的字节数</param>

/// <returns></returns>

public bool DownFile(string p_strFileName,string p_strFullPath, long p_lSpeed)

{

bool bRtn = false;

System.Web.UI.Page p_page = (Page)System.Web.HttpContext.Current.Handler;

//try1

try

{

#region "try1"

FileStream myFile = new FileStream(p_strFullPath, FileMode.Open,

FileAccess.Read, FileShare.ReadWrite);

BinaryReader br = new BinaryReader(myFile);

//try2

try

{

#region "try2"

//p_page.Response.Clear();

p_page.Response.AppendHeader("Accept-Ranges", "bytes");

p_page.Response.BufferOutput = false;

long fileLength = myFile.Length;

long startBytes = 0;

int pack = 10240; //10K bytes

//int sleep = 200; //每秒5次 即5*10K bytes每秒

int sleep = (int)Math.Floor(1000 * pack / p_lSpeed) + 1;

if (p_page.Request.Headers["Range"] != null)

{

p_page.Response.StatusCode = 206;

string[] range = p_page.Request.Headers["Range"].Split(new char[] {'=', '-'});

startBytes = Convert.ToInt64(range[1]);

}

p_page.Response.AppendHeader("Content-Length", (fileLength - startBytes).ToString());

if (startBytes != 0)

{

p_page.Response.AppendHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));

}

p_page.Response.AppendHeader("Connection", "Keep-Alive");

p_page.Response.ContentType = "application/octet-stream";

p_page.Response.AppendHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(p_strFileName,System.Text.Encoding.UTF8));

br.BaseStream.Seek(startBytes, SeekOrigin.Begin);

int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;

DateTime DownTimeStart = DateTime.Now;

for (int i = 0; i < maxCount; i++)

{

if(i == 1)

{

DownTimeStart = DateTime.Now;

}

if (p_page.Response.IsClientConnected)

{

p_page.Response.BinaryWrite(br.ReadBytes(pack));

p_page.Response.Flush();

Thread.Sleep(sleep);

//开始计算时间

bRtn = true;

}

else

{

maxCount = i;

bRtn = false;

break;

}

}

#endregion

System.TimeSpan tsDownTimeLen = DateTime.Now -DownTimeStart;

this.FactDownSpeed = (int)Math.Floor((int) Math.Floor((startBytes + maxCount * pack ) / tsDownTimeLen.TotalSeconds) / 1024);

}

catch

{

bRtn = false;

}

finally

{

p_page.Response.Flush();

br.Close();

myFile.Close();

}

#endregion

}

catch

{

bRtn = false;

}

return bRtn;

}

}

}

 
 
 
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