MemoryStream ms;

        public void ProcessRequest(HttpContext context)

        {

            string _filedir = context.Server.MapPath(@"/Styles/images/");

            try

            {

                string result = "3";

                int cout = context.Request.Files.Count;

                if (cout > 0)

                {

                    HttpPostedFile hpf = context.Request.Files[0];

                    if (hpf != null)

                    {

                        string fileExt = Path.GetExtension(hpf.FileName).ToLower();

                        //只能上传文件，过滤不可上传的文件类型  

                        string fileFilt = ".gif|.jpg|.php|.jsp|.jpeg|.png|......";

                        if (fileFilt.IndexOf(fileExt) <= -1)

                        {

                            result= "1";

                        }

                        int length = hpf.ContentLength; //判断文件大小 

                        if (length > 204800)

                        {

                            result= "2";

                        }

                        byte[] bt&n