[QUERY] Is it possible to delete a Blob through a BlobItem?

[WillRock19]

Query/Question
I'm converting a logic from an old library to a new one. In here, I'm getting all blobs from a container, filtering it by the LastModified property, and then deleting it. With the old library, I could do this in a very straight foward manner:

        var storageConnectionString = ConfigurationManager.ConnectionStrings["AzureWebJobsStorage"].ConnectionString;
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(storageConnectionString);
	CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

	var containerHostArchive = blobClient.GetContainerReference("azure-jobs-host-archive");
	if (containerHostArchive.Exists())
	{
		var blobsHostArchive = containerHostArchive
			.ListBlobs()
			.OfType<CloudBlob>()
			.Where(b => b.Properties.LastModified < new DateTimeOffset(DateTime.Now.AddDays(-RETENTION_DAYS_JOBS_LOGS)))
			.ToList();

		foreach (var item in blobsHostArchive)
		{
			item.DeleteIfExists();
		}
	}

In the new library, I'm not finding a easy way to do this. I have to make two access to the storage, first one to find the BlobItems from a container, the second to get a reference to the BlobClient so I can delete it (see bellow):}

                var blobContainerClient = storageWrapper.GetContainerReference(_connectionString, containerName); //Returns a BlobContainerClient
                var dateLastWeek = DateTime.Now.AddDays(-7);

                var desiredBlobs = blobContainerClient
                    .GetBlobs()
                    .ToList()
                    .Where(x => x.Properties.LastModified < dateLastWeek)
                    .ToList();

                var blobsToDelete = desiredBlobs
                    .Select(blob => storageWrapper.GetBlobReferenceNew(_connectionString, containerName, blob.Name)) //GetReferenceNew returns a BlobClient
                    .ToList();

                blobsToDelete.ForEach(blob => blob.DeleteIfExists());

Is there a way to do this without accessing the storage twice?

Environment:

• .Net Version: Full Framework 4.8
• Original version: Microsoft.WindowsAzure.Storage.Blob 9.3.2.0
• New version: Azure.Storage.Blobs v12.8.0
• IDE and version : Visual Studio 16.8.5

[ghost]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @xgithubtriage.

Issue Details

---

Query/Question
I'm converting a logic from an old library to a new one. In here, I'm getting all blobs from a container, filtering it by the LastModified property, and then deleting it. With the old library, I could do this in a very straight foward manner:

        var storageConnectionString = ConfigurationManager.ConnectionStrings["AzureWebJobsStorage"].ConnectionString;
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(storageConnectionString);
	CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

	var containerHostArchive = blobClient.GetContainerReference("azure-jobs-host-archive");
	if (containerHostArchive.Exists())
	{
		var blobsHostArchive = containerHostArchive
			.ListBlobs()
			.OfType<CloudBlob>()
			.Where(b => b.Properties.LastModified < new DateTimeOffset(DateTime.Now.AddDays(-RETENTION_DAYS_JOBS_LOGS)))
			.ToList();

		foreach (var item in blobsHostArchive)
		{
			item.DeleteIfExists();
		}
	}

In the new library, I'm not finding a easy way to do this. I have to make two access to the storage, first one to find the BlobItems from a container, the second to get a reference to the BlobClient so I can delete it (see bellow):}

                var blobContainerClient = storageWrapper.GetContainerReference(_connectionString, containerName); //Returns a BlobContainerClient
                var dateLastWeek = DateTime.Now.AddDays(-7);

                var desiredBlobs = blobContainerClient
                    .GetBlobs()
                    .ToList()
                    .Where(x => x.Properties.LastModified < dateLastWeek)
                    .ToList();

                var blobsToDelete = desiredBlobs
                    .Select(blob => storageWrapper.GetBlobReferenceNew(_connectionString, containerName, blob.Name)) //GetReferenceNew returns a BlobClient
                    .ToList();

                blobsToDelete.ForEach(blob => blob.DeleteIfExists());

Is there a way to do this without accessing the storage twice?

Environment:

• .Net Version: Full Framework 4.8
• Original version: Microsoft.WindowsAzure.Storage.Blob 9.3.2.0
• New version: Azure.Storage.Blobs v12.8.0
• IDE and version : Visual Studio 16.8.5

Author:	WillRock19
Assignees:	-
Labels:	Client, Service Attention, Storage, customer-reported, needs-team-attention, needs-triage, question
Milestone:	-

[seanmcc-msft]

This functionality is not supported by the SDK. BlobItem is a model, BlobClient is a client. This is a well established pattern in the new SDKs across Azure.

I have to make two access to the storage, first one to find the BlobItems from a container, the second to get a reference to the BlobClient so I can delete it

Getting a refence to a BlobClient doesn't actually make a REST call into the service, it just creates a new BlobClient locally. Same for newing up a BlobContainerClient

No matter what the SDK APIs look like, there is going to be a call into the storage service to list the blobs in a container, and another call for each blob you would like to delete.

-Sean