ASP.NET 上传文件至服务器,下载

#region  WebClient上传文件至服务器
        /// <summary>
        /// WebClient上传文件至服务器
        /// </summary>
        /// <param name="fileNamePath">文件名，全路径格式</param>
        /// <param name="uriString">服务器文件夹路径</param>
        /// <returns>Succefull</returns>
 
        public string UploadFile(string fileNamePath, string uriString)
        {
            string fileName = fileNamePath.Substring(fileNamePath.LastIndexOf("\\") + 1);
            string NewFileName = DateTime.Now.ToString("yyMMddhhmmss") + DateTime.Now.Millisecond.ToString() + fileNamePath.Substring(fileNamePath.LastIndexOf("."));
            string fileNameExt = fileName.Substring(fileName.LastIndexOf(".") + 1);
            if (uriString.EndsWith("/") == false)
            {
                uriString = uriString + "/";
            }
            uriString = uriString + NewFileName;
            // 创建WebClient实例
            System.Net.WebClient myWebClient = new WebClient();
            myWebClient.Credentials = CredentialCache.DefaultCredentials;
            // 要上传的文件
            FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
            //FileStream fs = OpenFile();
            BinaryReader r = new BinaryReader(fs);
            try
            {
                //使用UploadFile方法可以用下面的格式
                //myWebClient.UploadFile(uriString,"PUT",fileNamePath);
                byte[] postArray = r.ReadBytes((int)fs.Length);
                Stream postStream = myWebClient.OpenWrite(uriString, "PUT");
                if (postStream.CanWrite)
                {
                    postStream.Write(postArray, 0, postArray.Length);
                }
                else
                {
                    return "No Write.";
                }
                postStream.Close();
                return "Succefull";
            }
            catch (Exception ex)
            {
                return "Error:" + ex.Message;
            }
        }
        #endregion  
        #region  下载服务器文件至客户端
        /// <summary>
        /// 下载服务器文件至客户端
        /// </summary>
        /// <param name="URL">被下载的文件地址，绝对路径</param>
        /// <param name="Dir">另存放的目录</param>
        /// <returns></returns>
        public string Download(string URL, string Dir)
        {
            WebClient client = new WebClient();
            string fileName = URL.Substring(URL.LastIndexOf("/") + 1);  //被下载的文件名
            string Path = Dir + fileName;   //另存为的绝对路径＋文件名
            try
            {
                WebRequest myre = WebRequest.Create(URL);
            }
            catch (Exception ex)
            {
                return "Error:" + ex.Message;
            }
            try
            {
                client.DownloadFile(URL, Path);
                return "Succefull";
            }
            catch (Exception ex)
            {
                return "Error:" + ex.Message;
            }
        }
        #endregion