protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            try
            {
                //Session["userid"] = "adminTest";  //下载文件页面不能用session
                string userid = "";
                userid = Request.QueryString["uid"].ToString().Trim();
                string FileGuid = Request.QueryString["id"].ToString().Trim();
                Guid guid = new Guid(FileGuid);

                string FileServerPath = "";
                FileServerPath = bllfile.GetFilePath(userid, guid).ServerPath;
                if (FileServerPath == "")
                {
                    Response.Write("<font size=3 color=red>没有找到文件！</font>");
                }
                else
                {                    
                    if (!SendFile(FileServerPath))
                    {
                       Response.Write("<font size=3 color=red>下载出错，请与管理员联系！</font>");

                    }
                    else
                    {
                        int k = 0;
                        k = k + bllfile.Update(guid); //这里是去更新文件下载次数+1，但是文件越大下载的时间越长，这里就会多次执行，为什么，而不是只执行一次
                        if (k < 1)
                       {
                           Response.Write("<font size=3 color=red>更新您的下载次数失败</font>");
                        }
                }
            }
            catch (Exception ex)
            {
                Common.LogManager.LogWrite("Inner_ResourceList_DownFile-->Page_Load", ex.ToString());
                Response.Write("<font size=3 color=red>对不起，无法下载文件！</font>");
            }

            Response.End();
        }
    }
    private bool SendFile(string filename)
    {
        bool check;
        try
        {
            Response.Clear();
            Response.ClearHeaders();
            FileInfo f = new FileInfo(filename);

            Response.ContentType = "application/octet-stream";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");

            Response.AddHeader("Content-Disposition", "attachment;filename=" + Server.UrlPathEncode(f.Name));
            Response.TransmitFile(filename);

            check = true;
        }
        catch (Exception ex)
        {
            check = false;
        }
        return check;
    }