问题描述

我正在使用Azure Storage SDK V12，我正在寻找一种方法来打开指向特定Blob的流，就像以前的版本一样：

CloudBlobClient cloudBlobClient = account.CreateCloudBlobClient();

CloudBlobContainer container = cloudBlobClient.GetContainerReference("zipfiles");

var blob = container.GetBlockBlobReference(Guid.NewGuid().ToString());

// Here is the the functionality I am looking for: OpenWrite that returns a Stream.
using (Stream blobStream = blob.OpenWrite())
{
  ....
}

问题是我在新API中找不到可以让我访问Stream的OpenWrite方法。

问题

如何使用新的Azure Storage SDK V12将可写流打开到Blob？

解决办法

因为我使用的是Azure函数，所以我有一个解决办法，涉及将Blob用作函数的输出参数：

public async Task RunAsync(
            [BlobTrigger("data/{listId}/{name}.txt", Connection = "storageAccountConnectionString")]
            Stream sourceStream,
            string listId,
            string name,
            [Blob("data/{listId}/processed/{name}.txt", FileAccess.Write, Connection = "storageAccountConnectionString")] 
            Stream destinationStream)
{
    //  Here I use the destinationStream instance to upload data as it is being processed. It prevents me from loading everything in memory before calling the UploadAsync method of a BlobClient instance.
}

推荐答案

您需要使用Azure.Storage.Blobs.Specialized Nampase：

public async Task<Stream> CreateOutputStream(string fullFilePath)
{
    var blockBlobClient = _blobContainerClient.GetBlockBlobClient(fullFilePath);
    var stream = await blockBlobClient.OpenWriteAsync(true);

    return stream;
}

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