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MediatR v9.0.0 Release Notes

Release Date: 2020-10-09 // over 2 years ago

  • 🚀 This release contains a small, but breaking change. In order to provide a simpler interface, the IMediator interface is now split into two interfaces, a sender and publisher:

    public interface ISender{ Task\<TResponse\> Send\<TResponse\>(IRequest\<TResponse\> request, CancellationToken cancellationToken = default); Task\<object?\> Send(object request, CancellationToken cancellationToken = default); }public interface IPublisher{ Task Publish(object notification, CancellationToken cancellationToken = default); Task Publish\<TNotification\>(TNotification notification, CancellationToken cancellationToken = default) where TNotification : INotification; }public interface IMediator : ISender, IPublisher{ }

    The main motivation here is that sending should be a top-level concern of an application, but publishing can happen anywhere. This interface segregation should help catch design errors, where should never send requests from anywhere inside a request handler.


Previous changes from v8.0.2

  • 🚀 This is a minor release to add support for nullable reference types and target netstandard2.1 (#518).