上传多张图片用Session临时存储

  DataTable dtImages = new DataTable();

            string filepath = FileUpload1.PostedFile.FileName;

            //检查是否有文件要上传  

            if (this.FileUpload1.HasFile)

            {

                if (this.FileUpload1.PostedFile.ContentLength > 3096000)

                {

                    webmsg.message("文件不能超过3M!");

                    return;

                }



                filepath = FileUpload1.FileName;

                string filetype = System.IO.Path.GetExtension(filepath).ToLower();//获得后缀名  

                if (filetype == ".jpg" || filetype == ".png" || filetype == ".gif")

                {

                    DateTime dt = DateTime.Now;

                    string filename = string.Format("{0:yyyyMMddHHmmssffff}", dt) + filetype;



                    string savepath = Server.MapPath("../StudentCenter/Upload/") + filename;

                    FileUpload1.PostedFile.SaveAs(savepath);



                    string imgurl = "../StudentCenter/Upload/" + filename;



                    if (Session["UPLOAD"] == null)

                    {

                        dtImages.Columns.Add("imgUrl", typeof(object));

                        dtImages.Rows.Add(new object[] { imgurl });

                        Session["UPLOAD"] = dtImages;

                    }

                    else

                    {

                        dtImages = Session["UPLOAD"] as DataTable;

                        dtImages.Rows.Add(new object[] { imgurl });

                        Session["UPLOAD"] = dtImages;

                    }



                    dlst_img.DataSource = Session["UPLOAD"];

                    dlst_img.DataBind();

                }

                else

                {

                    webmsg.message("请上传jpg或png或gif的图片格式!");

                }

            }