How read all files from azure blob storage in C# Core

user_4104813 0
Viewed 30168

I want to read files from an azure blob storage (the files inside the folder), the blob storage contains many folders. I want to read my folder 'blobstorage' ,it contains many JSON files performing .read to each file and some manipulations. I tried many code that did not work:

 CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
            CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
            CloudBlobContainer container = blobClient.GetContainerReference($"blobstorage");

The above code uses 'Microsoft.WindowsAzure.Storage' nuget package. This code is not working as expected. In many questions and answers found in stack overflow I found that most of them are outdated and does not work. Note: if any nuget mention that also bcs they are many packages

azure-blob-storage azure-storage .net-core azure c#
5 Answers

I found the solution in this post and worked perfectly for me. You just have to read it as a normal stream after the download.

BlobServiceClient blobServiceClient = new BlobServiceClient("connectionString");
BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient("containerName");
BlobClient blobClient = containerClient.GetBlobClient("blobName.csv");
if (await blobClient.ExistsAsync())
{
  var response = await blobClient.DownloadAsync();
  using (var streamReader= new StreamReader(response.Value.Content))
  {
    while (!streamReader.EndOfStream)
    {
      var line = await streamReader.ReadLineAsync();
      Console.WriteLine(line);
    }
  }
}
user_133738280

I don't see any option to list all blob using Microsoft.WindowsAzure.Storage package. If you can use Azure.Storage.Blobs package then try below code.

using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;
using System;

namespace ConsoleApp2
{
    class Program
    {
        static string connectionString = "DefaultEndpointsProtocol=https;AccountName=storage******c9709;AccountKey=v**************************************;EndpointSuffix=core.windows.net";
        static string container = "azure-webjobs-hosts";
        static void Main(string[] args)
        {
            // Get a reference to a container named "sample-container" and then create it
            BlobContainerClient blobContainerClient = new BlobContainerClient(connectionString, container);
            blobContainerClient.CreateIfNotExists();
            Console.WriteLine("Listing blobs...");
            // List all blobs in the container
            var blobs = blobContainerClient.GetBlobs();
            foreach (BlobItem blobItem in blobs)
            {
                Console.WriteLine("\t" + blobItem.Name);
            }            
            Console.Read();
        }
    }
}

Output

enter image description here

You can also download the content of blob, Check this link

user_41402780
user_16707290
user_36612050

Try Below Code Out :

var connectionString = "your connection string";

        CloudStorageAccount storageacc = CloudStorageAccount.Parse(connectionString);
        //Create Reference to Azure Blob
        CloudBlobClient blobClient = storageacc.CreateCloudBlobClient();
        CloudBlobContainer container = blobClient.GetContainerReference("containerName");
        var blobs = container.GetDirectoryReference("FolderName").GetDirectoryReference("FolderName").ListBlobs().OfType<CloudBlockBlob>().ToList();
        Console.WriteLine("Total files found in directory: " + blobs.Count.ToString());
        var tempBlobList = blobs.Where(b => b.Name.Contains("fileName")).ToList();
        var response = await tempBlobList[0].DownloadTextAsync();
user_170283810
Related