为每个用户创建文件夹，并实现图片上传

        /// <summary>

        /// 用户登录即为每个用户创建文件夹,userid从session获取,即登录用户ID

        /// </summary>

        protected void CreateFlord()

        {

            path = "../../uploads/Picture/" + userid;

            imgpath = Server.MapPath(path).ToString();

            if (!Directory.Exists(imgpath))

            {

                Directory.CreateDirectory(imgpath);

            }

        }

        if (!this.fuImg.HasFile)

            {

                this.PicPrompt.InnerHtml = "图片路径不能为空";

                return;

            }

            Random rd = new Random();

            filename = DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() +DateTime.Now.Millisecond.ToString() + rd.Next(100000, 999999).ToString();//当前时间+随机数以重命名图片名字

              typefilename = System.IO.Path.GetExtension(this.fuImg.FileName).ToLower();

            if (typefilename != ".jpg" & typefilename != ".gif" & typefilename != ".png")

            {

                this.PicPrompt.InnerHtml = "图片只能为jpg、gif、png格式";

                return;

            }

            this.PicPrompt.InnerHtml = "";

            this.fuImg.SaveAs(imgpath + "\\" + filename + typefilename);

            SDW.Model.Picture model_picture = new SDW.Model.Picture();

            model_picture.PicName = filename;

            model_picture.PicUrl = path + "/" + filename + typefilename;

            model_picture.PicText = this.txtPicText.Text;

            model_picture.Createdate = DateTime.Now;

            model_picture.Album = Convert.ToInt32(this.ddlAlbum.SelectedItem.Value);

            model_picture.PicUser = userid;

            AddPicture(model_picture);//将图片信息保存到数据库