MediatR Simple mediator implementation in .NET for In-process messaging.
Supports request/response, commands, queries, notifications and events, synchronous and async with intelligent dispatching via C# generic variance.
https://github.com/jbogard/MediatR/wiki
Workflow Workflow is kind of container for business logic. It could combine set of queries and commands into single operation which matters to end user.
https://github.com/sergeyzwezdin/cqrs-spirit
Thin Controllers with CQRS and MediatR
http://codeopinion.com/thin-controllers-cqrs-mediatr/
Query Objects with a Mediator
http://codeopinion.com/query-objects-with-a-mediator/
Validating Commands with the Decorator Pattern