Stream iStream = null;byte[] buffer = new Byte[10240];// 缓冲区块10K bytes :int length;            long dataToRead;           string filepath = @"E:\software\SQL Server 2000 Personal Edition.ISO";string filename = System.IO.Path.GetFileName(filepath);try{    // 打开文件

iStream = new FileStream(filepath, FileMode.Open,FileAccess.Read, FileShare.Read);    Response.Clear();    dataToRead = iStream.Length;    long p = 0;    if (Request.Headers["Range"] != null)    {        Response.StatusCode = 206;        p = long.Parse(Request.Headers["Range"].Replace("bytes=", "").Replace("-", ""));    }    if (p != 0)    {        Response.AddHeader("Content-Range", "bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());    }    Response.AddHeader("Content-Length", ((long)(dataToRead - p)).ToString());    Response.ContentType = "application/octet-stream";    Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(filename)));    iStream.Position = p;    dataToRead = dataToRead - p;                  while (dataToRead > 0)    {                          if (Response.IsClientConnected)        {                           length = iStream.Read(buffer, 0, 10240);                                 Response.OutputStream.Write(buffer, 0, length);                                  Response.Flush();            buffer = new Byte[10240];            dataToRead = dataToRead - length;        }        else        {            //如果用户断开连接 防止无限循环

dataToRead = -1;        }    }}catch (Exception ex){                 Response.Write("Error : " + ex.Message);}finally{    if (iStream != null)    {        iStream.Close();    }    Response.End();}}

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