直接从WCF服务返回Azure Blob流 [英] Returning Azure Blob Stream directly from WCF service

问题描述

我希望通过WCF将流从Azure Blob存储直接返回到浏览器. 基本上，我有一个REST WCF服务，我希望在文件存储在Azure Blob存储中的同时让用户通过该服务下载文件.

I am looking to return a stream from Azure Blob Storage directly to the browser via WCF. Basically I have a REST WCF service and I am looking to have users download files via the service while the files are stored in Azure Blob storage.

这个问题

从WCF服务中将Azure BLOB作为流返回-我们需要关闭它吗?

它执行我喜欢的操作，但是它首先将整个文件下载到一个新的流中，是否有一种方法可以将Blob流作为WCF的返回流提供给WCF，因此WCF的作用更像是该流的代理?

it does what I like however it downloads the entire file to a new stream first, is there a way to give the blob stream as the return stream from WCF so WCF acts more like a proxy for the stream?

我的问题是大文件(> 10MB)，我真的不想从Azure存储下载整个流，然后才能开始将其返回给用户.

My issue is with large files (> 10MB), I really do not want to download the entire stream from Azure storage before I can start returning it to the user.

我这样做的原因是，在允许访问存储在Azure Blob存储中的文件之前，我正在对用户进行一些安全检查，其中一些文件的大小可能最大为1GB.

The reason I am doing it this way is I am doing some security checks on my user before I will allow access to the file that is stored in Azure Blob Storage, also some of the files could be up to 1GB in size.

推荐答案

在WCF用于授权客户端(并检查blob是否仍然存在，等等)的地方，我做过类似的事情.如果一切正常，则WCF服务返回带有共享访问签名的URL-这允许客户端直接从存储访问流.节省了将Blob拉到wcf角色然后从那里进行流传输的交易成本.

I have done something similar where WCF was used to authorize the client (and check the blob still exists and so on). If everything was OK the WCF service returned a URL with a Shared Access Signature - this allowed the client to access the stream directly from storage. Saving the transaction costs of pulling the blob to the wcf role and then streaming from there.

这可能适合您吗?

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