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:

Cloud         


        

Answer 1

Try this pattern. Can be handy when browsing big storages. I found it much more GC and memory footprint friendly

var blobAccount = "";
var apiKey = "";
var containerName = "";
var storageCredentials = new StorageCredentials(blobAccount, apiKey);

var account = new CloudStorageAccount(storageCredentials, true);
var blobClient = account.CreateCloudBlobClient();
var container = blobClient.GetContainerReference(containerName);
var blobLimit = 500

if (container == null) { return; }

var blobContinuationToken = new BlobContinuationToken();

using (var fs = new FileStream("Output.csv", FileMode.Create))
{
    var sw = new StreamWriter(fs);
    sw.WriteLine("Type,Name,Length");

    BlobContinuationToken continuationToken = null;
    do
    {   
        var blobList = container.ListBlobsSegmented("",
                                   true,
                                   BlobListingDetails.Metadata,
                                   blobLimit,
                                   continuationToken,
                                   new BlobRequestOptions
                                   {
                                       LocationMode = LocationMode.PrimaryOnly
                                   },
                                   null);

        continuationToken = blobList.ContinuationToken;

        // I was looking only for BlockBlobs
        foreach (var item in blobList.Results.OfType())
        {
            sw.WriteLine($"block,\"{item.Name}\",{item.Properties.Length}");
        }

    } while (continuationToken != null);
}