How could I abstract from INotificationHandler<T>?

[arakakivl]

Something like this:

public interface IDomainNotificationHandler : INotificationHandler<DomainNotification>
{
    public bool HasNotifications();
    public DomainNotification? GetFirstPublishedNotification();
}

public class DomainNotificationHandler : IDomainNotificationHandler
{
    private readonly List<DomainNotification> _notifications;
    public IReadOnlyCollection<DomainNotification> Notifications => _notifications;

    public DomainNotificationHandler()
    {
        _notifications = new();
    }

    public async Task Handle(DomainNotification notification, CancellationToken cancellationToken)
    {
        _notifications.Add(notification);
        await Task.CompletedTask;
    }
    
    public bool HasNotifications() =>
        _notifications.Any();

    public DomainNotification? GetFirstPublishedNotification() =>
        _notifications.FirstOrDefault();
}

Is it possible?

[jbogard]

No, it is not. Either use INotificationHandler or create your own interface and publisher. MediatR is not designed to be abstracted away, MediatR is the abstraction.

[craigfowler]

Thanks for confirming this. We just looking into similar in a project and came to the same conclusion. There's no benefit in abstracting from MediatR because you'd need to duplicate a lot of MediatR's functionality in order to do so usefully.