很奇怪 微软都做了些什么？

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
{
///

1<summary>   
2/// FileDown 的摘要说明。   
3/// </summary>

public class FileDown
{
private string m_strFullPath;
private long m_lSpeed;
private int m_iFactDownSpeed;
private string m_strFileName;

///

1<summary>   
2/// 下载页显示文件名   
3/// </summary>

public string FileName
{
get{return m_strFileName;}
set{m_strFileName = value;}
}
///

1<summary>   
2/// 带文件名下载路径   
3/// </summary>

public string FullPath
{
get{return m_strFullPath;}
set{m_strFullPath = value;}
}
///

1<summary>   
2/// 每秒允许下载的字节数   
3/// </summary>

public long Speed
{
get{return m_lSpeed;}
set{m_lSpeed = value;}
}

///

1<summary>   
2/// 实际下载速度   
3/// </summary>

public int FactDownSpeed
{
get{return m_iFactDownSpeed;}
set{m_iFactDownSpeed = value;}
}
///

1<summary>   
2/// 表示一个下载   
3/// </summary>

public FileDown()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
///

1<summary>   
2/// 开始下载文件   
3/// </summary>

///

1<returns></returns>

public bool DownFile()
{
return DownFile(this.FileName,this.FullPath,this.Speed);
}
///

1<summary>   
2/// 开始下载文件   
3/// </summary>

///

1<param name="p_strFileName"/>

下载页显示文件名
///

1<param name="p_strFullPath"/>

带文件名下载路径
///

1<param name="p_lSpeed"/>

每秒允许下载的字节数
///

1<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;
}

}
}