B/S 页面点击后有个下载文档的操作，如何在下载后重新绑定页面信息

modishizhe1 2013-08-01 10:18:04

客户端点击后，后天有个下载页面的操作，这是下载的源代码

private void Download(string filepath, string filename)

        {

            if (!String.IsNullOrEmpty(filename))

            {

                System.IO.Stream iStream = null;

                byte[] buffer = new Byte[10240];

                int length;

                long dataToRead;

                try

                {

                    iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,

                    System.IO.FileAccess.Read, System.IO.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(System.IO.Path.GetFileName(filename), System.Text.Encoding.UTF8));

                    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

                        {

                            dataToRead = -1;

                        }

                    }

                }

                catch (Exception ex)

                {

                    Response.Write("Error : " + ex.Message);

                }

                finally

                {

                    if (iStream != null)

                    {

                        iStream.Close();

                    }

                }

            }

        }