How to create dependency injection for ISendEndPointProvider for MultiBus - masstransit

Question

I currently register Masstransit for two bus controls. I would like to inject ISendEndPointProvider for SecondBus as DI (I don't want to call GetSendEndPoint() in caller). How can I do that. When ISendEndPointProvider always return for the first bus.
Program.cs
services.AddMassTransit(x =>
{
x.AddConsumer<FirstConsumer>();
x.AddBus(provider => Bus.Factory.CreateUsingRabbitMq(cfg =>
{
cfg.Host(new Uri(rabbitMqOption.RabbitMqHost), h =>
{
h.Username(rabbitMqOption.RabbitMqUser);
h.Password(rabbitMqOption.RabbitMqPassword);
h.Heartbeat(10);
});
cfg.ReceiveEndpoint(rabbitMqOption.RabbitMqQueue, e =>
{
e.PrefetchCount = rabbitMqOption.RabbitMqPrefetchCount;
e.Consumer<FirstConsumer>(provider.Container);
});
}));
});
services.AddMassTransit<ISecondBus, SecondBus>(x =>
{
x.AddBus(provider => Bus.Factory.CreateUsingRabbitMq(cfg =>
{
cfg.Host(rabbitMqOption.NotificationRabbitMqHost, hostConfig =>
{
hostConfig.Username(rabbitMqOption.RabbitMqUser);
hostConfig.Password(rabbitMqOption.RabbitMqPassword);
});
}));
});

Answer 1

When using MultiBus, the ISendEndpointProvider and IPublishEndpoint interfaces when outside of a consumer will always point to IBus. There is no way to get the second bus without depending upon ISecondBus.
If the interface is used by a consumer (or a scoped consumer dependency), those interfaces will refer to the bus on which the message was received.
Configuration Errors
Also, you should change your .AddBus calls to .UsingRabbitMq((context, cfg), which gives you proper access to the container via the context argument. The AddBus syntax will eventually be deprecated.
The correct syntax is shown below (along with a corrected consumer configuration):
services.AddMassTransit(x =>
{
x.AddConsumer<FirstConsumer>();
x.UsingRabbitMq((context, cfg) =>
{
cfg.Host(new Uri(rabbitMqOption.RabbitMqHost), h =>
{
h.Username(rabbitMqOption.RabbitMqUser);
h.Password(rabbitMqOption.RabbitMqPassword);
h.Heartbeat(10);
});
cfg.ReceiveEndpoint(rabbitMqOption.RabbitMqQueue, e =>
{
e.PrefetchCount = rabbitMqOption.RabbitMqPrefetchCount;
e.ConfigureConsumer<FirstConsumer>(context);
});
}));
});

Answer 2

Adding a bit more for a solution that worked on my end after a couple hours of trial and error.
First, add this Nuget package: MassTransit.Extensions.DependencyInjection,
Then, here is exactly how I'm registering MassTransit:
services.AddMassTransit(x =>
{
x.AddConsumer(typeof(MyConsumerType));
x.UsingAzureServiceBus((context, cfg) =>
{
cfg.Host(configuration[Constants.KeyVaultSecretServiceBusConnectionString]);
cfg.Message<IDataPrivacyEvent>(cfg => cfg.SetEntityName(MessagingConstants.DataPrivacyEndpoint));
cfg.ConfigureEndpoints(context);
cfg.UseMessageRetry(m => m.Interval(5, TimeSpan.FromSeconds(10)));
cfg.SubscriptionEndpoint<IValidationEvent>(MessagingConstants.ValidationEndpoint, e =>
{
e.ConfigureConsumer(context, typeof(MyConsumerType));
e.UseMessageRetry(m => m.Interval(5, TimeSpan.FromSeconds(10)));
});
});
});