Microsoft Azure Developer Associate AZ-204 Practice Question
You upload files to a block blob by using the Azure.Storage.Blobs .NET SDK. The upload operation already assigns the correct ContentType header. You must add two custom metadata entries, Department=Finance and Retention=7Years, without changing the existing ContentType. Which action should you take?
Call BlobClient.SetMetadataAsync with a dictionary that contains the two key-value pairs.
Add the key-value pairs to BlobHttpHeaders and call BlobClient.SetHttpHeadersAsync.
Include the metadata in BlobUploadOptions when calling UploadAsync, omitting any HttpHeaders.
Invoke BlobContainerClient.SetMetadataAsync on the container with the new metadata.
BlobClient.SetMetadataAsync sets or updates only the user-defined metadata for a blob and leaves system properties such as ContentType unchanged. Supplying metadata through BlobHttpHeaders or SetHttpHeadersAsync would overwrite the ContentType unless it is explicitly included again. Passing metadata via BlobUploadOptions would require re-uploading the blob and still risks header changes. Setting metadata on the container does not affect existing blobs, only the container itself.
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What is BlobClient.SetMetadataAsync in Azure.Storage.Blobs?
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What would happen if you use BlobHttpHeaders or SetHttpHeadersAsync to add metadata?
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Why is BlobContainerClient.SetMetadataAsync not suitable for setting metadata on individual blobs?
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Microsoft Azure Developer Associate AZ-204
Develop for Azure storage
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