简单的文件上传和下载

上传代码

        if (FileUpload1.HasFile)
        {
            try
            {
                if (txtCategory.Text == "")
                {
                    Label5.Text = "文档上次失败，请输入上传文档所属类型！";
                    divGridInformationAsset.Style["Display"] = "Block";
                }
                else
                {
                    //获取上传文件名
                    string filename = this.FileUpload1.FileName;
                    //获取上传文件后缀名
                    string filetype = filename.Substring(filename.LastIndexOf(".") + 1);
                    //上传的当前时间作为文件名
                    string newFileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + "." + filetype;
                    string filePath = Server.MapPath("../Upload") + "\\" + newFileName;
                    FileUpload1.SaveAs(filePath);
                    BProjectAttachRule.InsertBProjectAttachData(txtHID, newFileName, filePath, System.DateTime.Now, txtCategory.Text, "文档", 1);
                    Label5.Text = "文档上传成功！";
                    txtCategory.Text = "";
                    GetDateGridBProjectInformationAsset();
                }
            }
            catch (Exception ex)
            {
                Label5.Text = "发生错误：" + ex.Message.ToString();
                divGridInformationAsset.Style["Display"] = "Block";
            }
        }
        else
        {
            Label5.Text = "没有选择要上传的文件！";
            divGridInformationAsset.Style["Display"] = "Block";
        }

下载代码

                string fileName = e.CommandArgument.ToString();
                string filePath = Server.MapPath("../Upload/" + e.CommandArgument.ToString());
                if (File.Exists(filePath))
                {
                    //以字符流的形式下载文件
                    FileStream fs = new FileStream(filePath, FileMode.Open);
                    byte[] bytes = new byte[(int)fs.Length];
                    fs.Read(bytes, 0, bytes.Length);
                    fs.Close();
                    Response.ContentType = "application/octet-stream";
                    //通知浏览器下载文件而不是打开
                    Response.AddHeader("Content-Disposition", "attachment;  filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
                    Response.BinaryWrite(bytes);
                    Response.Flush();
                    Response.End();
                }
                else
                {
                    Page.RegisterStartupScript("ServiceManHistoryButtonClick", "<script>alert('服务器不存在该附件！');</script>");

                }