C# retrieving a list of blobs from Azure

Question

I need to have some archive cleanup code to remove old Azure logs after a certain retention period has occurred.

I am aware that I can do this:

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Answer 1

Use the UseFlatBlobListing parameter like this:

CloudStorageAccount storageAccount = CloudStorageAccount.Parse("");
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference("ctr");

var blobList = container.ListBlobs(useFlatBlobListing: true)
foreach(var blob in blobList)
{
    logger.Info($"Blob Name: {blob.Uri}");
}

This will give you all blobs in a flattened way.

See https://docs.microsoft.com/en-us/dotnet/api/microsoft.windowsazure.storage.blob.cloudblobcontainer.listblobs?view=azure-dotnet

If you also include the prefix parameter you can filter results based on the folder structure. To get everything in may 2017 you can do

var blobList = container.ListBlobs(prefix: "2017/5/", useFlatBlobListing: true)

This might help reducing the list of blobs depending on your retention.