How to read data from azure blob storage in real time.

Question

I want to develop an application in which data is in azure blob storage and after data processing i want to read that data in my application.

Answer 1

@TestDeveloper12345 If your application has to react to events much quicker than this, consider using Blob Storage events . Blob Storage Events provides real-time one-time events which enable your Azure Functions or applications to quickly react to changes that occur to a blob.

You can rely on the Blob Storage events and read the sensor data using function app. More Info here: https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob-trigger?tabs=in-process%2Cextensionv5&pivots=programming-language-csharp

If you wants to use the Logic App then they can leverage this: https://techcommunity.microsoft.com/t5/azure-paas-blog/add-file-watcher-on-containers-in-azure-storage-account-using/ba-p/1301993

Please let us know if you have any further queries. I’m happy to assist you further.

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Answer 2

Hi @TestDeveloper12345 ,
Here is a C# method to list all files in a blob container:

    public async Task ListAsync()  
            {  
                // Get a connection string to our Azure Storage account.  
                string connectionString = ConnectionString;  
      
                // Get a reference to a container named "sample-container" and then create it  
                BlobContainerClient container = new BlobContainerClient(connectionString, Randomize("sample-container"));  
                await container.CreateAsync();  
                try  
                {     
                    // List all the blobs  
                    List<string> names = new List<string>();  
                    await foreach (BlobItem blob in container.GetBlobsAsync())  
                    {  
                        names.Add(blob.Name);  
                    }  
                }  
                catch(Exception ex)  
                {  
                    // Log the exception  
                }  
            }  

If you know the path of the file you want to download, then you can make use of the following method:

public async Task DownloadImageAsync(string downloadPath)  
        {  
            // Download the public blob at https://aka.ms/bloburl  
            await new BlobClient(new Uri("https://yourbloburl")).DownloadToAsync(downloadPath);  
     
  
            byte[] fileBinary = File.ReadAllBytes(downloadPath)//you have the binary of the file so you can decide what to do with the file.  
        }