C#/.NET: How do I create a DNS record in an Azure DNS zone using the new ARM SDK?

I need to programmatically create a TXT DNS record in an Azure DNS zone. Using the Azure.Management.Dns package, this could be achieved like this:

using Azure.Identity;
using Azure.Management.Dns;

var dnsClient = new DnsManagementClient(new DefaultAzureCredential()){SubscriptionId="mySubscriptionId"};
...
await dnsClient.RecordSets.CreateOrUpdateAsync(resourceGroupName, zoneName, recordSetName, RecordType.TXT, recordSet);

Now MS has marked the Azure.Management.Dns package as deprecated and recommends to use the Azure.ResourceManager.Dns package instead. Microsoft's own documentation however still uses the deprecated package, including examples.

Unfortunately, I don't really see where the documentation of the corresponding new ARM models explains how to create a new TXT record, and sadly MS does not provide any examples with that one.

Could someone please point me in the right direction?

Edit: Originally claimed the ARM package would be in beta, turns out it is not.

The new (post-2019) Azure.ResourceManager.* NuGet package libraries have adopted newer C# features like IAsyncEnumerable, which makes some operations nonobvious for discovery by those (like us) who expect a more conventional API design (so it actually took me a while to figure out how to answer your question).

But you'll want something like this:

Step 1: Get an authenticated ArmClient instance and your target SubscriptionResource:

This works for me in Linqpad and console programs, though obviously you'll want to use DefaultAzureCredential in deployed code:

//#define ARGH_ITS_NOT_WORKING // Uncomment this if you're having AAD/Entra authX problems.

const String TENANT_ID       = "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee";
const String SUBSCRIPTION_ID = "ffffffff-1111-2222-3333-444444444444";

#if ARGH_ITS_NOT_WORKING
using AzureEventSourceListener listener = AzureEventSourceListener.CreateConsoleLogger();
#endif

InteractiveBrowserCredentialOptions credsOpts = new InteractiveBrowserCredentialOptions()
{
    DisableAutomaticAuthentication = true,
    TenantId = TENANT_ID
};

#if ARGH_ITS_NOT_WORKING
credsOpts.Diagnostics.IsAccountIdentifierLoggingEnabled = true;
#endif

InteractiveBrowserCredential creds = new InteractiveBrowserCredential( credsOpts );
AuthenticationRecord authRecord = await creds.AuthenticateAsync();

ArmClient armClient = new ArmClient( creds );

//

SubscriptionResource sub = await armClient.GetDefaultSubscriptionAsync();
if( sub.Id.SubscriptionId != SUBSCRIPTION_ID ) throw new InvalidOperationException( "Unexpected default Subscription." );

Step 2: Get the Zone, add records, submit:

• We have ArmClient armClient and SubscriptionResource sub from step 1.
• You'll need to add System.Linq.Async for ToListAsync().
• The .Dump() method is an extension-method from Linqpad. You can safely remove those calls.
• The GetDnsZonesAsync() method is an extension-method on Azure.ResourceManager.Dns.SubscriptionResourceExtensionClient.

using Azure.ResourceManager;
using Azure.ResourceManager.Dns;

//

List<DnsZoneResource> dnsZones = await sub.GetDnsZonesAsync().ToListAsync();
DnsZoneResource zone0 = dnsZones.First().Dump();

DnsTxtRecordCollection txtRecords = zone0.GetDnsTxtRecords();

DnsTxtRecordData newTxtRecordValues = new DnsTxtRecordData()
{
    TtlInSeconds = 300, You must set a non-null TTL or the request will be rejected.
    DnsTxtRecords = 
    {
        new DnsTxtRecordInfo()
        {
            Values = 
            {
                "foo",
                "bar"
            }
        }
    }
};

ArmOperation<DnsTxtRecordResource> newResourceOp = await txtRecords.CreateOrUpdateAsync( WaitUntil.Completed, txtRecordName: "baz", data: newTxtRecordValues );
DnsTxtRecordResource newResource = newResourceOp.Value;

newResource.Dump();

Screenshot proof: