/// <summary>    /// 阿里云儲存幫助類（歡迎訪問www.weixh.net微笑話，幫我漲點人氣謝謝大家了）    /// </summary>    public class AliyunHelper    {        const string accessKeyId = "<your access key id>";        const string accessKeySecret = "<your access key secret>";        const string endpoint = "<valid host name>";        #region 上傳部分        /// <summary>        /// 簡單上傳文件        /// </summary>        /// <param name="file">上傳控件</param>        /// <param name="key">文件標識</param>        /// <param name="bucketName">空間名</param>        public static string AliyunUploadFile(FileUpload file, string key, string bucketName)        {            try            {                Stream sr = file.PostedFile.InputStream;                var client = new OssClient(endpoint, accessKeyId, accessKeySecret);                var result = client.PutObject(bucketName, key, sr);                return "succeeded";            }            catch (OssException ex)            {                return "上傳失敗:" + ex.ErrorCode;            }            catch (Exception ex)            {                return ex.Message;            }        }        /// <summary>        /// 簡單上傳文件        /// </summary>        /// <param name="file">上傳控件</param>        /// <param name="key">文件標識</param>        /// <param name="bucketName">空間名</param>        public static string AliyunUploadFile(HttpPostedFile file, string key, string bucketName)        {            try            {                Stream sr = file.InputStream;                var client = new OssClient(endpoint, accessKeyId, accessKeySecret);                var result = client.PutObject(bucketName, key, sr);                return "succeeded";            }            catch (OssException ex)            {                return "上傳失敗:" + ex.ErrorCode;            }            catch (Exception ex)            {                return ex.Message;            }        }        /// <summary>        /// 分片上傳        /// </summary>        /// <param name="bucketName">空間名</param>        /// <param name="key">唯一標識</param>        /// <param name="file">上傳控件</param>        /// <param name="partSize">每片大小（默認5MB）</param>        /// <returns></returns>        public static string AliyunUploadPart(string bucketName, string key, FileUpload file, int partSize = 5*1024*1024)        {            try            {                Stream sr = file.PostedFile.InputStream;                OssClient client = new OssClient(endpoint, accessKeyId, accessKeySecret);                client.PutBigObject(bucketName, key, sr, null, partSize);                return "succeeded";            }            catch (OssException ex)            {                return "上傳失敗:" + ex.ErrorCode;            }            catch (Exception ex)            {                return "上傳失敗:" + ex.Message;            }        }        /// <summary>        /// 分片上傳        /// </summary>        /// <param name="bucketName">空間名</param>        /// <param name="objectName">key</param>        /// <param name="fileToUpload">指定分片上傳文件路徑</param>        /// <param name="partSize">分片大?。▎挝唬鹤止潱?/span></param>        public static void UploadMultipart(String bucketName, String key, FileUpload file, int partSize = 5*1024*1024)        {            var uploadId = InitiateMultipartUpload(bucketName, key);            var partETags = UploadParts(bucketName, key, file, uploadId, partSize);            var completeResult = CompleteUploadPart(bucketName, key, uploadId, partETags);            //Console.WriteLine(@"Upload multipart result : " + completeResult.Location);        }        PRivate static string InitiateMultipartUpload(String bucketName, String objectName)        {            var request = new InitiateMultipartUploadRequest(bucketName, objectName);            OssClient client = new OssClient(endpoint, accessKeyId, accessKeySecret);            var result = client.InitiateMultipartUpload(request);            return result.UploadId;        }        private static List<PartETag> UploadParts(String bucketName, String objectName, FileUpload file, String uploadId, int partSize)        {            var fileSize = file.PostedFile.ContentLength;            var partCount = fileSize / partSize;            if (fileSize % partSize != 0)            {                partCount++;            }            var partETags = new List<PartETag>();            using (var sr = file.PostedFile.InputStream)            {                for (var i = 0; i < partCount; i++)                {                    var skipBytes = (long)partSize * i;                    sr.Seek(skipBytes, 0);                    var size = (partSize < fileSize - skipBytes) ? partSize : (fileSize - skipBytes);                    var request = new UploadPartRequest(bucketName, objectName, uploadId)                    {                        InputStream = sr,                        PartSize = size,                        PartNumber = i + 1                    };                    OssClient client = new OssClient(endpoint, accessKeyId, accessKeySecret);                    var result = client.UploadPart(request);                    partETags.Add(result.PartETag);                }            }            return partETags;        }        private static CompleteMultipartUploadResult CompleteUploadPart(String bucketName, String objectName, String uploadId, List<PartETag> partETags)        {            var completeMultipartUploadRequest =                new CompleteMultipartUploadRequest(bucketName, objectName, uploadId);            foreach (var partETag in partETags)            {                completeMultipartUploadRequest.PartETags.Add(partETag);            }            OssClient client = new OssClient(endpoint, accessKeyId, accessKeySecret);            return client.CompleteMultipartUpload(completeMultipartUploadRequest);        }        #endregion        #region URL訪問        /// <summary>        /// URL獲取        /// </summary>        /// <param name="bucketName"></param>        /// <param name="key"></param>        /// <returns></returns>        public static string GetUrlGet(string bucketName, string key)        {            var req = new GeneratePresignedUriRequest(bucketName, key, SignHttpMethod.Get)            {                Expiration = new DateTime().AddHours(1)            };            var client = new OssClient(endpoint, accessKeyId, accessKeySecret);            var uri = client.GeneratePresignedUri(req);            return uri.ToString();        }        /// <summary>        /// URL獲取        /// </summary>        /// <param name="bucketName"></param>        /// <param name="key"></param>        /// <param name="timeMinutes">過期時間（分）</param>        /// <returns></returns>        public static string GetUrlGet(string bucketName, string key, int timeMinutes)        {            var req = new GeneratePresignedUriRequest(bucketName, key, SignHttpMethod.Get)            {                Expiration = new DateTime().AddMinutes(timeMinutes)            };            var client = new OssClient(endpoint, accessKeyId, accessKeySecret);            var uri = client.GeneratePresignedUri(req);            return uri.ToString();        }        #endregion        #region 文件下載        /// <summary>        /// 從指定的OSS存儲空間中獲取指定的文件        /// </summary>        /// <param name="bucketName">要獲取的文件所在的存儲空間的名稱</param>        /// <param name="key">要獲取的文件的名稱</param>        /// <param name="fileToDownload">文件保存的本地路徑</param>        public static string GetObject(string bucketName, string key, string fileToDownload)        {            try            {                // 初始化OssClient                var client = new OssClient(endpoint, accessKeyId, accessKeySecret);                var obj = client.GetObject(bucketName, key);                using (var requestStream = obj.Content)                {                    byte[] buf = new byte[1024];                    var fs = File.Open(fileToDownload, FileMode.OpenOrCreate);                    var len = 0;                    while ((len = requestStream.Read(buf, 0, 1024)) != 0)                    {                        fs.Write(buf, 0, len);                    }                    fs.Close();                }                return "succeeded";            }            catch (Exception ex)            {                return ex.Message;            }        }        #endregion    }