Microsoft Azure Developer Associate AZ-204 Practice Question
A .NET 6 console application receives files as Stream objects and must store each file in Azure Blob Storage by using the Azure.Storage.Blobs 12.x SDK. The solution must meet these requirements:
Upload the stream as a block blob.
Throw an exception if a blob with the same name already exists.
Support cancellation through a provided CancellationToken.
Do not overwrite an existing blob by using the convenience overwrite parameter. Which code approach should you use?
Call BlockBlobClient.StageBlockAsync for each block and then CommitBlockListAsync.
Calling BlobClient.UploadAsync and passing the stream together with a BlobUploadOptions that contains a BlobRequestConditions object whose IfNoneMatch property is set to "*" satisfies all the requirements. The IfNoneMatch condition instructs the service to perform the upload only when no blob currently exists with the same name; otherwise, the service returns status code 412 and the SDK surfaces a RequestFailedException. Because UploadAsync uploads the data from the supplied stream and accepts a CancellationToken parameter, the cancellation requirement is also met. The other options either overwrite existing blobs, require manual block staging, or copy from a URI rather than from the incoming stream.
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Microsoft Azure Developer Associate AZ-204
Develop for Azure storage
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