How should be initialized CorrelationId at MassTransit

Question

I'd like to track my messages using built-in interface CorrelatedBy<TKey>, but i didn't quite understand: should i initialize it myself, for example, in constructor of my message (command)?

public class RegisterCallback : IRegisterCallback
{
    public RegisterCallback()
    {
        CorrelationId = Guid.NewGuid();
    }

    public Guid RequestId { get; set; }
    public Guid CorrelationId { get; }
}

Answer 1

You should initialize it by either passing it into the constructor, or otherwise generating it as part of the constructor.

public RegisterCallback(Guid correlationId) {...}

Or you can generate it using NewId to get an ordered identifier.

public RegisterCallback()
{
    CorrelationId = NewId.NextGuid();
}

Also, your interface should include CorrelatedBy<Guid> if you want to use the built-in support.

public interface IRegisterCallback :
    CorrelatedBy<Guid> {...}