How to get hold of all the blobs in a Blob container which has sub directories levels(n levels)?

Question

Tried using the ListBlobsSegmentedAsync method , but this returns only the blobs from the main parent directory level ..

But I need the entire list of blobs at one go from all the n levels of subdirectories.

BlobContinuationToken continuationToken = null;
bool useFlatBlobListing = true;
BlobListingDetails blobListingDetails = BlobListingDetails.None;
int maxBlobsPerRequest = 500;
var blobOptions = new BlobRequestOptions (true );

do
 {
    var listingResult = await cbDir.ListBlobsSegmentedAsync(useFlatBlobListing, blobListingDetails, maxBlobsPerRequest, continuationToken, null, null);
    continuationToken = listingResult.ContinuationToken;
    srcBlobList.AddRange(listingResult.Results);
 } while (continuationToken != null);

Answer 1

The ListBlobsSegmentedAsync method has 2 overloads that contain the useFlatBlobListing argument. These overloads accept 7 or 8 arguments, and I count 6 in your code. Because there are so many arguments, you can use named arguments to make the code easier to understand.

The code below has been tested successfully in .NET Core.

BlobContinuationToken blobContinuationToken = null;
do
{
    var resultSegment = await cloudBlobContainer.ListBlobsSegmentedAsync(
        prefix            : null,
        useFlatBlobListing: true, 
        blobListingDetails: BlobListingDetails.None,
        maxResults        : null,
        currentToken      : blobContinuationToken,
        options           : null,
        operationContext  : null
    );

    // Get the value of the continuation token returned by the listing call.
    blobContinuationToken = resultSegment.ContinuationToken;
    foreach (IListBlobItem item in resultSegment.Results)
    {
        Console.WriteLine(item.Uri);
    }
} while (blobContinuationToken != null); // Loop while the continuation token is not null.

This code is derived from Microsoft's storage-blobs-dotnet-quickstart repository.

Answer 2

Use this override of ListBlobsSegmentedAsync method: https://msdn.microsoft.com/en-us/library/dn434672.aspx and make sure that you pass true for useFlatBlobListing parameter. This will list all blobs from all subdirectories.

UPDATE

This is the code I have used and it returns me the blobs in that subfolder and all subfolders inside that subfolder.

    /// <summary>
    /// Code to fetch blobs from "temp" folder inside "blah" blob container.
    /// </summary>
    private static void GetFilesInSubfolder()
    {
        var account = new CloudStorageAccount(new StorageCredentials(accountName, accountKey), true);
        var blobClient = account.CreateCloudBlobClient();
        var container = blobClient.GetContainerReference("blah");
        var directory = container.GetDirectoryReference("temp");
        var result = directory.ListBlobsSegmented(true, BlobListingDetails.None, 500, null, null, null);
        var blobs = result.Results;
    }