Delete "subpath" from Azure Storage - azure

Question

I know Azure doesn't have actual subpaths, but if I have for example container/projectID/iterationNumber/filename.jpg and I delete a project, how can I delete from ProjectID? Is it possible through coding?
I don't want to use the azure application as I am creating a web app.
Thanks in Advance
EDIT:
This is the code provided by Microsoft to target on specific item:
// Retrieve storage account from connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
CloudConfigurationManager.GetSetting("StorageConnectionString"));
// Create the blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve reference to a previously created container.
CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");
// Retrieve reference to a blob named "myblob.txt".
CloudBlockBlob blockBlob = container.GetBlockBlobReference("myblob.txt");
// Delete the blob.
blockBlob.Delete();
SystemDesignModel
public static SystemDesign returnImageURL(IListBlobItem item)
{
if (item is CloudBlockBlob)
{
var blob = (CloudBlockBlob)item;
return new SystemDesign
{
URL = blob.Uri.ToString(),
};
}
return null;
}
}

Answer 1

As you know, blob storage does not have the concept of subfolders. It has just 2 level hierarchy - container & blobs. So in essence, a subfolder is just a prefix that you attach to blob name. In your example, the actual file you uploaded is filename.jpg but its name from blob storage perspective is projectID/iterationNumber/filename.jpg.
Since there is no concept of subfolder, you just can't delete it like we do on our local computer. However there's a way. Blob storage provides a way to search for blobs starting with a certain blob prefix. So what you have to do is first list all blobs that start with certain prefix (projectID in your case) and then delete the blobs one at a time returned as a result of listing operations.
Take a look at sample code below:
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
CloudConfigurationManager.GetSetting("StorageConnectionString"));
var container = storageAccount.CreateCloudBlobClient().GetContainerReference("container");
BlobContinuationToken token = null;
do
{
var listingResult = container.ListBlobsSegmented("blob-prefix (projectID in your case)", true, BlobListingDetails.None, 5000, token, null, null);
token = listingResult.ContinuationToken;
var blobs = listingResult.Results;
foreach (var blob in blobs)
{
(blob as ICloudBlob).DeleteIfExists();
Console.WriteLine(blob.Uri.AbsoluteUri + " deleted.");
}
}
while (token != null);