NATS

BindingsCollection.NATS registers only NATSOperationBinding.

using ByteBard.AsyncAPI.Bindings.NATS;
using ByteBard.AsyncAPI.Models;

var operation = new AsyncApiOperation();
operation.Bindings.Add(new NATSOperationBinding { Queue = "workers" });

Bindings.Add(binding) stores the instance under its BindingKey (nats); no key string is needed.

The operation binding's Queue is a string. There are no NATS server, channel, or message parsers in this collection.

Write

Attach the typed binding to the operation's bindings collection, then serialize the containing document. The operation references its channel in this AsyncAPI 3.1.0 example:

using ByteBard.AsyncAPI;
using ByteBard.AsyncAPI.Bindings.NATS;
using ByteBard.AsyncAPI.Models;
using System.Collections.Generic;

var document = new AsyncApiDocument
{
    Info = new AsyncApiInfo { Title = "Orders", Version = "1.0.0" },
    Channels = new Dictionary<string, AsyncApiChannel>
    {
        ["orders"] = new AsyncApiChannel { Address = "orders" },
    },
    Operations = new Dictionary<string, AsyncApiOperation>
    {
        ["consumeOrders"] = new AsyncApiOperation
        {
            Action = AsyncApiAction.Receive,
            Channel = new AsyncApiChannelReference("#/channels/orders"),
        },
    },
};
document.Operations["consumeOrders"].Bindings.Add(new NATSOperationBinding
{
    Queue = "workers",
});

var yaml = document.SerializeAsYaml(AsyncApiVersion.AsyncApi3_0);

Read and use

Continuing from the Write example above, this snippet uses its yaml variable.

using System;
using ByteBard.AsyncAPI.Bindings;
using ByteBard.AsyncAPI.Bindings.NATS;
using ByteBard.AsyncAPI.Models;
using ByteBard.AsyncAPI.Readers;

var settings = new AsyncApiReaderSettings { Bindings = BindingsCollection.NATS };
var parsed = new AsyncApiStringReader(settings).Read(yaml, out var diagnostics);
if (parsed.Operations["consumeOrders"].Bindings.TryGetValue<NATSOperationBinding>(out var nats))
{
    Console.WriteLine(nats.Queue);
}

Typed lookup returns false if no NATS operation binding is present. These examples target AsyncAPI 3.1.0; if serializing as 2.x, the document's operation/channel layout is converted as well as the binding. Queue semantics are not checked against a running NATS server. See shared setup.