用jquery uploadify上传插件上传文件

 public void ProcessRequest(HttpContext context)
    {
        string esOIDs = System.Web.HttpContext.Current.Request["esOIDs"];
        string userID=System.Web.HttpContext.Current.Session["USER_ID"].ToString();
        
        context.Response.ContentType = "text/plain";
        context.Response.Charset = "utf-8";

        HttpPostedFile file = context.Request.Files["Filedata"];
        string Path = HttpContext.Current.Server.MapPath(@context.Request["folder"]) + "\\AccessoryFiles";
        
        if (!Directory.Exists(Path))//判断文件是否存在
        {
            Directory.CreateDirectory(Path);
        }

        if (file != null)
        {
            if (file.ContentLength <= 1024 * 1024 * 1024)//限定文件小于100M
            {
                bool fileOK = false;
                string fileExtension = System.IO.Path.GetExtension(file.FileName).ToLower(); //得到选择文件 扩展名

                string[] allowedExtensions = { ".doc", ".docx", ".ppt", ".pptx", ".xls", ".xlsx", ".pdf",".wmv",".avi", ".gif", ".png", ".bmp", ".jpg", ".mp4", ".rar", ".zip" }; //可上传文件类型列表
                for (int i = 0; i < allowedExtensions.LongLength; i++)//判断上传文件是否为上述合法类型
                {
                    if (fileExtension == allowedExtensions[i])
                    {
                        fileOK = true;
                        break;
                    }
                }

                if (fileOK == true)//如果文件格式正确
                {
                    string uploadPath = Path + "\\" + esOIDs;
                    if (!Directory.Exists(uploadPath))//判断文件是否存在
                    {
                        Directory.CreateDirectory(uploadPath);
                    }

                    string fileNewName = DateTime.Now.ToString("yyyyMMddHHmmss") + System.IO.Path.GetExtension(file.FileName).ToLower();
                    file.SaveAs(uploadPath + "\\" + fileNewName);

                    if (!Directory.Exists(uploadPath + "\\" + fileNewName))
                    {
                        AccessoryObj accessoryObj = new AccessoryObj();
                        accessoryObj.REFOID = esOIDs;
                        accessoryObj.ReftypeVal = AccessoryType.项目;
                        accessoryObj.FILENAME = file.FileName;
                        accessoryObj.FILETYPE = fileExtension;
                        accessoryObj.FILEPATH = "FileUpLoad/AccessoryFiles/" + esOIDs + "/" + fileNewName;
                        accessoryObj.UPLOADUSER = userID;
                        accessoryObj.UPLOADDATE = DateTime.Now;

                        List<AccessoryObj> accList = new List<AccessoryObj>();
                        accList.Add(accessoryObj);
                        new AccessoryRepository().AddAccessoryObj(accList);
                    }

                    //下面这句代码缺少的话，上传成功后上传队列的显示不会自动消失
                    context.Response.Write("1");
                }
            }
        }
        else
        {
            context.Response.Write("0");
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }