// 输出硬盘文件，提供下载  // 输入参数 _Request: Page.Request对象，  _Response: Page.Response对象， _fileName: 下载文件名， _fullPath: 带文件名下载路径， _speed 每秒允许下载的字节数  // 返回是否成功  public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)  {   try   {    FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);    BinaryReader br = new BinaryReader(myFile);    try    {     _Response.AddHeader("Accept-Ranges", "bytes");     _Response.Buffer = 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 / _speed) + 1;     if (_Request.Headers["Range"] != null)     {      _Response.StatusCode = 206;      string[] range = _Request.Headers["Range"].Split(new char[] {'=', '-'});      startBytes = Convert.ToInt64(range[1]);     }     _Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());     if (startBytes != 0)     {      _Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));     }     _Response.AddHeader("Connection", "Keep-Alive");     _Response.ContentType = "application/octet-stream";     _Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );      br.BaseStream.Seek(startBytes, SeekOrigin.Begin);     int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;      for (int i = 0; i < maxCount; i++)     {      if (_Response.IsClientConnected)      {       _Response.BinaryWrite(br.ReadBytes(pack));       Thread.Sleep(sleep);      }      else      {       i=maxCount;       }     }    }    catch    {     return false;    }    finally    {     br.Close();     myFile.Close();    }   }   catch   {    return false;   }   return true;  }调用例   Page.Response.Clear();         bool success = ResponseFile(Page.Request, Page.Response, "filename", @"C:\download.date", 1024000);      if(!success)    Response.Write("下载文件出错！");    Page.Response.End();

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