MediatR
Simple, unambitious mediator implementation in .NET
...Supports request/response, commands, queries, notifications and events, synchronous and async with intelligent dispatching via C# generic variance. You should install MediatR with NuGet. Or via the .NET Core command line interface. Either commands, from Package Manager Console or .NET Core CLI, will download and install MediatR and all required dependencies. MediatR is a low-ambition library trying to solve a simple problem, decoupling the in-process sending of messages from handling messages. Cross-platform, supporting .NET Framework 4.6.1 and netstandard2.0. MediatR has no dependencies. You will need to configure a single factory delegate, used to instantiate all handlers, pipeline behaviors, and pre/post-processors.