Function that deletes files out of an azure storage container, after X amount of days.

gistfile1.cs

  private readonly string _storageAccountName;
  private readonly string _storageKey;
  private readonly string _storageContainer;
  private readonly int _cleanupThreshold;
  private const string CloudStorageconnectionString = @"DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1}";
  
  public IEnumerable<string> BlobCleanup()
  {
      var storageAccount = CloudStorageAccount.Parse(string.Format(CloudStorageconnectionString, _storageAccountName, _storageKey));
      var client = storageAccount.CreateCloudBlobClient();
 
      var container = client.GetContainerReference(_storageContainer);
 
      var blobs = container.ListBlobs(null, true);
 
      var filtered = blobs.Where(a => a is CloudBlockBlob && 
                      ((CloudBlockBlob)a).Properties.LastModified < DateTime.Now.AddDays(_cleanupThreshold)
                      ).ToList();
 
      var deleted = new List<string>();
 
      foreach(var item in filtered)
      {
          var blob = (CloudBlockBlob)item;
          deleted.Add(blob.Name);
          blob.Delete();
      }
 
      return deleted;
  }