c# - 如何使用新的 Azure 存储 SDK v12 打开新 Blob 的可写流？

Question

我正在使用 Azure 存储 SDK v12，并且正在寻找一种方法来打开特定 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 中找不到可以访问 Stream 的 OpenWrite 方法。

问题

如何使用新的 Azure 存储 SDK v12 打开 Blob 的可写流？

<小时/>

解决方法

由于我正在使用 Azure Functions，因此我有一个解决方法，其中涉及使用 Blob 作为函数的 Out 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.
}

Answer 1

您需要使用 Azure.Storage.Blobs.Specialized 命名空间中的 GetBlockBlobClient 扩展方法:

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

    return stream;
}