Question

How to create a sub-container in Azure Storage location?

Answer 1

You can create a container named "content" and create blobs with the following names in that container:

content/blue/images/logo.jpg
content/blue/images/icon-start.jpg
content/blue/images/icon-stop.jpg

content/red/images/logo.jpg
content/red/images/icon-start.jpg
content/red/images/icon-stop.jpg

These blobs are a flat list against your "content" container. That said, using the "/" as a conventional delimiter, provides you with the functionality to traverse these in a heirarchical fashion.

protected IEnumerable<IListBlobItem> 
          GetDirectoryList(string directoryName, string subDirectoryName)
{
    CloudStorageAccount account =
        CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
    CloudBlobClient client = 
        account.CreateCloudBlobClient();
    CloudBlobDirectory directory = 
        client.GetBlobDirectoryReference(directoryName); 
    CloudBlobDirectory subDirectory = 
        directory.GetSubdirectory(subDirectoryName); 

    return subDirectory.ListBlobs();
}

You can then call this as follows:

GetDirectoryList("content/blue", "images")

Note the use of GetBlobDirectoryReference and GetSubDirectory methods and the CloudBlobDirectory type instead of CloudBlobContainer. These provide the traversal functionality you are likely looking for.