ajax 上傳 demo

string result = "N";        if (Request.QueryString["FILENAME"] != null)        {            try            {                string fileName = Server.UrlDecode(Request.QueryString["FILENAME"]).Substring(Request.QueryString["FILENAME"].LastIndexOf("."));                StringBuilder newFileName = new StringBuilder(DateTime.Now.ToString("yyyyMMddhhss")).Append(fileName);                WebClient webClient = new WebClient();                webClient.Credentials = CredentialCache.DefaultCredentials;                FileStream fs = new FileStream(Server.UrlDecode(Request.QueryString["FILENAME"]), FileMode.Open, FileAccess.Read);                BinaryReader br = new BinaryReader(fs);                byte[] postArray = br.ReadBytes(Convert.ToInt32(fs.Length));                string temp = Server.MapPath(@"~/images/") + newFileName;                Stream postStream = webClient.OpenWrite(temp, "PUT");                if (postStream.CanWrite)                {                    postStream.Write(postArray, 0, postArray.Length);                    result = "Y";                }            }            catch            {            }            finally            {                Response.Write(result);            }