Finance | Project Operations, Human Resources, ...

How to check folder is present in Azure blob container

(1) Share

Report

Posted on by CU21091228-0

161

Hi Team,

Inside the azure blob container name i am having multiple folders, like below.

ContinerName/Folder1/Folder2

In case of any folder is missing i would like to show some error message.

In above if Folder2 is missing show error like folder is not present.

Below is the code which i am using.

using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Auth;
using Microsoft.WindowsAzure.Storage.Blob;
using Microsoft.WindowsAzure.Storage.File;


 public void checkFolderName(str _filePath)
 {
     CloudBlobContainer blobcontainer;
     CloudBlobClient    blobClient;
      
     
     var credential     = new StorageCredentials("StorageAccountName", "StorageAccessKey");
     var storageAccount = new CloudStorageAccount(credential, true);
     blobClient         = storageAccount.CreateCloudBlobClient();
     blobcontainer      = blobClient.GetContainerReference(_filePath);
  }

Please let me know how to achieve this.

All responses (12)

Answers (0)

Martin Dráb 230,370 Most Valuable Professional on at

Like (0)

Report

How to check folder is present in Azure blob container

CU21091228-0, you're indeed calling GetBlobs incorrectly. Your code assumes that the method has a single string parameter, but that's not true. Look at the documentation of GetBlobs() method to see how it's defined. Also, Jones has given you an example in the meantime.
Jonas "Jones" Melgaard 1,920 on at

Like (0)

Report
How to check folder is present in Azure blob container

I have written an annotated example job as a learning opportunity for you.

You will be able to adapt this to your method, and rewrite it so it matches your coding style, I have a really odd one if I'm not caffeinated properly...

Do let me know if you have any questions

//Example for https://community.dynamics.com/forums/thread/details/?threadid=3901f86c-6485-ef11-ac21-6045bda935ce using Azure.Storage.Blobs; using Azure.Storage.Blobs.Models; internal final class CheckDirectory { //This example uses Azure.Storage.Blobs, as Microsoft.WindowsAzure.Storage will be deprecated in the near future //You can find the documentation here: https://www.nuget.org/packages/Azure.Storage.blobs/ //Samples here: https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/storage/Azure.Storage.Blobs/samples //NOTICE: I am using a connection string in this example, please adapt it to how you plan to authenticate public static void Main(Args _args) { //Connection string str connectionString = "https://*connectionString*"; //Blob prefix (As in your question, folder) str prefix = "foo/bar/bas"; //Initializes a new blob container client: https://learn.microsoft.com/en-us/dotnet/api/azure.storage.blobs.blobcontainerclient?view=azure-dotnet //Due to X++ limitations, .Net method parameters cannot be defaulted if (new BlobContainerClient(new System.Uri(connectionString)) //Lists blobs in directory .GetBlobs( //Blob traits: https://learn.microsoft.com/en-us/dotnet/api/azure.storage.blobs.models.blobtraits?view=azure-dotnet BlobTraits::None, //Blob states: https://learn.microsoft.com/en-us/dotnet/api/azure.storage.blobs.models.blobstates?view=azure-dotnet BlobStates::None, //Blob prefix prefix, //Cancelation token (Note: Not used) //https://learn.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken?view=net-8.0 new System.Threading.CancellationToken(false)) //Gets enumerator .GetEnumerator() //Iterate enumerator. Will return false at end of enumerator: https://learn.microsoft.com/en-us/dotnet/api/system.collections.ienumerator.movenext?view=net-8.0 .MoveNext()) { info("Directory found!"); } } }
CU21091228-0 161 on at

Like (0)

Report
How to check folder is present in Azure blob container

I have added below code.

Using Azure.Storage.Blobs; public void checkFolderName(str _filePath, str _containerName) { BlobContainerClient blobContainerClient; // blobContainerClient.GetBlobs(_filePath); }

Below error i am getting.
Martin Dráb 230,370 Most Valuable Professional on at

Like (0)

Report

How to check folder is present in Azure blob container

I think I see your problem. Your code (the call of ListBlobs()) assumes that you're using Microsoft.Azure.Storage.Blob.CloudBlobDirectory, but you aren't. You're using CloudBlobDirectory from Microsoft.WindowsAzure.Storage.Blob namespace.

Note that the latest library for this purpose is Azure.Storage.Blobs. I think that the solution there is using BlobContainerClient.GetBlobs() with the folder path in the prefix parameter.
Martin Dráb 230,370 Most Valuable Professional on at

Like (0)

Report

How to check folder is present in Azure blob container

I'm sorry, but "Ax is not supporting blobs.count()" is not a good description of a problem. Please tell us what happened. For example, did you get a compilation error a runtime exception? What did the error message said?
CU21091228-0 161 on at

Like (0)

Report
How to check folder is present in Azure blob container

In Azure blob container having multiple folders, i would like to check those folder is present or not, if not present throw a error.

Below us my AX code.

using Microsoft.WindowsAzure.Storage; using Microsoft.WindowsAzure.Storage.Auth; using Microsoft.WindowsAzure.Storage.Blob; using Microsoft.WindowsAzure.Storage.File; public void checkFolderName(str _filePath, str _containerName) { CloudBlobContainer blobcontainer; CloudBlobClient blobClient; var credential = new StorageCredentials("StorageAccountName", "StorageAccessKey"); var storageAccount = new CloudStorageAccount(credential, true); blobClient = storageAccount.CreateCloudBlobClient(); blobcontainer = blobClient.GetContainerReference(_containerName); CloudBlobDirectory cloudBlobDirectory = blobContainer.GetBlobDirectoryReference(_filePath); }

I try below code, Ax is not supporting blobs.count()

var blobs = CloudBlobDirectory.ListBlobs(false, 0, null, null); boolean directoryExists = blobs.Count() > 0;
Martin Dráb 230,370 Most Valuable Professional on at

Like (0)

Report
How to check folder is present in Azure blob container

Split it to two calls. For example:
var blobs = CloudBlobDirectory.ListBlobs(); boolean directoryExists = blobs.Count() > 0;

It'll likely fix your problem. If not, please describe the problem to us.
CU21091228-0 161 on at

Like (0)

Report
How to check folder is present in Azure blob container

I try like below.

boolean directoryExists = CloudBlobDirectory.ListBlobs().Count() > 0

But Ax is not support .Count() after ListBlobs().
Suggested answer

Martin Dráb 230,370 Most Valuable Professional on at

Like (1)

Report

How to check folder is present in Azure blob container

Let me quote an answer from StackOverflow:

In blob storage, directories don't exist as an item by themselves. What you can have is a blob that has a name that can be interpreted as being in a directory. If you look at the underlying REST API you'll see that that there's nothing in there about directories. What the storage client library is doing for you is searching for blobs that start with the directory name then the delimiter e.g. "DirectoryA/DirectoryB/FileName.txt". What this means is that for a directory to exist it must contain a blob. To check if the directory exists you can try either:

var blobDirectory = client.GetBlobDirectoryReference("Path_to_dir");
bool directoryExists = blobDirectory.ListBlobs().Count() > 0

or

bool directoryExists = client.ListBlobsWithPrefix("DirectoryA/DirectoryB/").Count();
CU21091228-0 161 on at

Like (0)

Report
How to check folder is present in Azure blob container

Below code i am using.

CloudBlobDirectory cloudBlobDirectory = blobContainer.GetBlobDirectoryReference('Folder1/Folder2'); if (!cloudBlobDirectory) { throw error ("Folder name not found"); }

In case folder path is not present i am not getting any error, please let me know where i am wrong.