I am trying to use
var adminClient = new ServiceBusAdministrationClient(
to fetch some topics related data.
I see that ServiceBusAdministrationClient can be used for one SB. Is there a way to get a list of SBs in an Azure subscription or Resource Group so I can loop on it and do the same thing.
The SDK you would want to use is Microsoft.Azure.Management.ServiceBus.
To list Namespaces in a Subscription, the method you will need to use is NamespacesOperationsExtensions.ListAsync.
Similarly to list Namespaces in a Resource Group, the method you will need to use is NamespacesOperationsExtensions.ListByResourceGroupAsync
Your code would be something like (untested though):
var credentials = new DefaultAzureCredentials();
using (ServiceBusManagementClient client = new ServiceBusManagementClient(credentials))
{
client.SubscriptionId = subscriptionId;
var namespaces = client.Namespaces.ListAsync();
}