Mediatr Introduction

MediatR works by providing a central mediator that handles communication between components through requests and handlers. It supports two main types of messages: Request/Response pairs where one handler processes a request and returns a response, and Notifications which can trigger multiple handlers. When a request is sent through MediatR, it automatically discovers and invokes the appropriate handler for that request type using .NET's dependency injection. The library also implements a pipeline behavior system similar to ASP.NET Core middleware, allowing you to add cross-cutting concerns like logging, validation, and caching around request processing. All communication happens in-process within the same application, with handlers being simple POCO classes that implement MediatR's handler interfaces.