How do I access blob storage sub containers in my ASP.NET Core web application? - azure

Question

I've created a solution to access my container contents within my asp.net core 3.1 application and return that contents as a list to my view. At the moment the application access data in the root container which is called upload, however, this container has many sub containers and I would like to list the blobs in a specific one called 1799.
So, instead of accessing upload and showing me the full contents of that container, I want to access upload/1799 and list all the blobs within that container.
I cannot see of anyway to add this sub container to my method and allow this to happen, can anyone help?
Here is my code so far:
CarController.cs
using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;
namespace MyProject.Controllers
{
public class HomeController : Controller
{
private readonly IConfiguration _configuration;
private readonly string accessKey = string.Empty;
public HomeController(IConfiguration configuration)
{
_configuration = configuration;
accessKey = _configuration.GetConnectionString("AzureStorage");
}
[HttpGet]
public IActionResult Edit(int id)
{
var car = _carService.GetVessel(id);
string strContainerName = "uploads";
string subdir = "1799";
var filelist = new List<BlobListViewModel>();
BlobServiceClient blobServiceClient = new BlobServiceClient(accessKey);
BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(strContainerName);
var blobs = containerClient.GetBlobs();
foreach (var item in blobs)
{
filelist.Add(new BlobListViewModel
{
FileName = item.Name
});
}
return View(filelist);
}
}
I've hunted through all the documentation and I can't find anything related to this.

Answer 1

Thanks to David Browne for his comment, there is indeed a prefix option in GetBlob(). THey act like mini-filters in some ways allowing you to define what properties are returned and the blob state etc. Here is my code which has the options set to zero meaning Default for both Trait and State.
[HttpGet]
public IActionResult Edit(int id)
{
var car = _carService.GetVessel(id);
string strContainerName = "uploads";
string subdir = "1799";
var filelist = new List<BlobListViewModel>();
BlobServiceClient blobServiceClient = new BlobServiceClient(accessKey);
BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(strContainerName);
//Traits, States, Prefix
var blobs = containerClient.GetBlobs(0, 0, subdir);
foreach (var item in blobs)
{
filelist.Add(new BlobListViewModel
{
FileName = item.Name
});
}
return View(filelist);
}