$("#id").uploadify({
          height: 30,

});

int FileMaxSize = 10240;//文件大小，单位为Kpublicvoid ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            string ParentID = context.Request.Params["id"];
            HttpPostedFile fileUpload = context.Request.Files[0];
            if (fileUpload != null)
            {
                try
                {
                    string UploadDir = "~/upload/";//图片保存的文件夹
                    //图片保存的文件夹路径
                    string path = context.Server.MapPath(UploadDir);
                    //每天上传的图片一个文件夹
                    string folder = DateTime.Now.ToString("yyyyMM");
                    //如果文件夹不存在，则创建
                    if (!Directory.Exists(path + folder))
                    {
                        Directory.CreateDirectory(path + folder);
                    }
                    //上传图片的扩展名
                    string fileExtension = fileUpload.FileName.Substring(fileUpload.FileName.LastIndexOf('.'));
                    //判断文件格式
                    if (!CheckValidExt(fileExtension))
                    {
                        context.Response.Write("错误提示：文件格式不正确！" + fileExtension);
                        return;
                    }
                    //判断文件大小
                    if (fileUpload.ContentLength > FileMaxSize * 1024)
                    {
                        context.Response.Write("错误提示：上传的文件(" + fileUpload.FileName + ")超过最大限制：" + FileMaxSize + "KB");
                        return;
                    }
                    //保存图片的文件名
                    //string saveName = Guid.NewGuid().ToString() + fileExtension;
                    //使用时间+随机数重命名文件
                    string strDateTime = DateTime.Now.ToString("yyMMddhhmmssfff");//取得时间字符串
                    Random ran = new Random();
                    string strRan = Convert.ToString(ran.Next(100, 999));//生成三位随机数
                    string saveName = strDateTime + strRan + fileExtension;

Model.Album uc = new Model.Album();

uc.Title = fileUpload.FileName;
                    uc.ImagePath = folder + "/" + saveName;
                    uc.PostTime = DateTime.Now; 
                    uc.Pid= int.Parse(id);
                    bll.Album alb = new bll.Album();
                    alb.add(uc);

//保存图片
                    fileUpload.SaveAs(path + folder + "/" + saveName);
                    context.Response.Write(UploadDir + folder + "/" + saveName);
                }
                catch
                {
                    context.Response.Write("错误提示：上传失败");
                }

}

}

public bool IsReusable
        {
            get
            {
                return false;
            }
        }

#region 检测扩展名的有效性 bool CheckValidExt(string sExt) 
        /// <summary>
        /// 检测扩展名的有效性
        /// </summary>
        /// <param name="sExt">文件名扩展名</param>
        /// <returns>如果扩展名有效,返回true,否则返回false.</returns>
        public bool CheckValidExt(string strExt)
        {
            bool flag = false;
            string[] arrExt = AllowExt.Split('|');
            foreach (string filetype in arrExt)
            {
                if (filetype.ToLower() == strExt.ToLower().Replace(".", ""))
                {
                    flag = true;
                    break;
                }
            }
            return flag;
        }
        #endregion

onUploadSuccess: function (file, data, response) {//上传完成时触发（每个文件触发一次）
                    if (data.indexOf('错误提示') > -1) {
                        alert(data);
                    }
                    else {
                        //$("#previewImage").attr("src", data.substr(2)).hide().fadeIn(2000);
                        alert("上传成功！");
                        jQuery("#albumList").append("<img src='"+data+"' />");

}
                },
                'onUploadError': function (file, errorCode, errorMsg, errorString) {//当单个文件上传出错时触发
                    alert('文件：' + file.name + ' 上传失败: ' + errorString);}