我希望用户能够从我的网站下载blob.我想要最快/ cheapeast /最好的方式来做到这一点.
这是我想出的：
CloudBlobContainer blobContainer = CloudStorageServices.GetCloudBlobsContainer();
CloudBlockBlob blob = blobContainer.GetBlockBlobReference(blobName);
MemoryStream memStream = new MemoryStream();
blob.DownloadToStream(memStream);
Response.ContentType = blob.Properties.ContentType;
Response.AddHeader("Content-Disposition","Attachment; filename=" + fileName + fileExtension);
Response.AddHeader("Content-Length",(blob.Properties.Length).ToString());
Response.BinaryWrite(memStream.ToArray());
Response.End();
我现在正在使用内存流,但我猜我应该使用文件流,因为在某些情况下,blob是大的..对吧？
解决方法
恕我直言,最便宜,最快的解决方案是从blob存储直接下载.目前,您的代码首先在您的服务器上下载blob并从那里进行流式传输.您可以做的是创建具有读取权限和Content-Disposition标头集的共享访问签名,并基于该创建blob URL并使用该URL.在这种情况下,blob内容将直接从存储流式传输到客户端浏览器.
例如,看下面的代码：
public ActionResult Download()
{
CloudStorageAccount account = new CloudStorageAccount(new StorageCredentials("accountname","accountkey"),true);
var blobClient = account.CreateCloudBlobClient();
var container = blobClient.GetContainerReference("container-name");
var blob = container.GetBlockBlobReference("file-name");
var sasToken = blob.GetSharedAccessSignature(new SharedAccessBlobPolicy()
{
Permissions = SharedAccessBlobPermissions.Read,SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(10),//assuming the blob can be downloaded in 10 miinutes
},new SharedAccessBlobHeaders()
{
ContentDisposition = "attachment; filename=file-name"
});
var blobUrl = string.Format("{0}{1}",blob.Uri,sasToken);
return Redirect(blobUrl);
}
