URL of Blobs in Azure with directory structure

Question

Assembly in use: Assembly Microsoft.WindowsAzure.Storage, Version=9.3.1.0

What I want to do: In my Azure storage, I have images stored as a blob, in the following fashion

I want to get the URLs of all the image blobs along with their last modified timestamp.

Please note that Image1 and Image4 might have the same name.

What I have tried:

I tried ListBlobsSegmentedAsync(BlobContinuationToken currentToken) from the root of the container and by using GetDirectoryReference(string relativeAddress) but couldn't get the desired result.
Though a bit off track, I am able to get the blob details by GetBlockBlobReference(string blobName);

What should I do?

Thanks in advance.

Well, remember that blob storage does not actually have folders, they are virtual. So you really have blobs with names e.g. "Folder1/Image1.png". ListBlobsSegemented should give you all the blobs, can you show the code you tried? — juunas
– juunas, Commented Feb 11, 2020 at 12:45

Joey Cai · Accepted Answer · 2020-02-11 13:34:28Z

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.

Use the following code to list all blob in container.

public static async Task test()
{
    StorageCredentials storageCredentials = new StorageCredentials("xxx", "xxxxx");
    CloudStorageAccount storageAccount = new CloudStorageAccount(storageCredentials, true);
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
    CloudBlobContainer container = blobClient.GetContainerReference("container");
    BlobContinuationToken blobContinuationToken = null;
    var resultSegment = await container.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);
     }
}

The result is as below:

answered Feb 11, 2020 at 13:34

Joey Cai

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1 Comment

NutsAndBolts Over a year ago

Thanks, by mistake I was using 'ListBlobsSegmentedAsync' of 'CloudBlobClient'.

Gaurav Mantri · Accepted Answer · 2020-02-11 12:50:04Z

0

Please try this override of ListBlobsSegmentedAsync with the following parameters:

prefix: ""

useFlatBlobListing: true

blobListingDetails: BlobListingDetails.All

maxResults: 5000

currentToken: null or the continuation token returned

This will return you a list of all blobs (including inside virtual folders)

answered Feb 11, 2020 at 12:50

Gaurav Mantri

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