原來是用的PutObject()方式上傳文件的，但是當文件比較大的時候，總是報一個對方強制關閉連接導致上傳失敗。PS：公司的網比較渣，10MB的文件都傳不上去，搜了下，說使用Multipart Upload方式上傳比較好，經過一番折騰，終于搞定了。

使用的是Upload Part Copy拷貝上傳上傳的方式。

官方文檔：http://docs.aliyun.com/?spm=5176.383663.9.6.tg4Xaf#/pub/oss/sdk/dotnet-sdk&multipart-upload

/// <summary>/// 將文件保存到阿里云oss /// </summary> /// <param name="httpPostedFile">要保存的文件</param> /// <param name="path">保存的文件路徑</param> /// <returns>上傳文件的路徑</returns> public string SaveFile(HttpPostedFile httpPostedFile, string path) { //http://docs.aliyun.com/?spm=5176.383663.9.6.tg4Xaf#/pub/oss/sdk/dotnet-sdk&multipart-upload string fileExt = Path.GetExtension(httpPostedFile.FileName); string fileName = Path.Combine(path, Common.GetRamCode() + fileExt); OssClient client = ALOssClient.GetInstance(); var bucketName = "wlx-zhibo"; var objectName = fileName; // 開始Multipart Upload var request = new InitiateMultipartUploadRequest(bucketName, fileName); var r = client.InitiateMultipartUpload(request); // 打印UploadId Console.WriteLine(r.UploadId); var partSize = 102400; var fileSize = httpPostedFile.ContentLength; var partCount = fileSize / partSize; if (fileSize % partSize != 0) { partCount++; } var partETags = new List<PartETag>(); using (var inputStream = httpPostedFile.InputStream) { for (var i = 0; i < partCount; i++) { var skipBytes = (long)partSize * i; inputStream.Seek(skipBytes, 0); var size = (partSize < fileSize - skipBytes) ? partSize : (fileSize - skipBytes); var req = new UploadPartRequest(bucketName, objectName, r.UploadId) { InputStream = inputStream, PartSize = size, PartNumber = i + 1 }; var uploadPart = client.UploadPart(req); partETags.Add(uploadPart.PartETag); } } var completeMultipartUploadRequest = new CompleteMultipartUploadRequest(bucketName, objectName, r.UploadId); foreach (var partETag in partETags) { completeMultipartUploadRequest.PartETags.Add(partETag); } var result = client.CompleteMultipartUpload(completeMultipartUploadRequest); return result.Location; }

總結

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