asp.net 文件下载。

        #region 文件下载

        public void downloadfile(int id)
        {
            try
            {
                chr_Action_Apply apply = db.chr_Action_Apply.Find(id);
                string s_fileName = Request["FileName"];//文件名
                Response.ContentType = "application/ms-download";
                string s_path = HttpContext.Server.MapPath("/UpLoad/Other/") + s_fileName;//保存路径
                System.IO.FileInfo file = new System.IO.FileInfo(s_path);
                Response.Clear();
                Response.AddHeader("Content-Type", "application/octet-stream");
                Response.Charset = "utf-8";
                Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(file.Name, System.Text.Encoding.UTF8));
                Response.AddHeader("Content-Length", file.Length.ToString());
                Response.WriteFile(file.FullName);
                Response.Flush();
                Response.Clear();
                Response.End();
                apply.clicknum = apply.clicknum + 1;//下载次数+1
                db.SaveChanges();
            }
            catch (Exception)
            {

                Response.Write("<script>alert('文件下载失败,请重试...');history.go(-1);</script>");
            }
        }
        #endregion