dotnet-mediatr

To decouple request handling in .NET, you implement the MediatR mediator pattern, which separates request senders from receivers. This eliminates direct method calls and tightly coupled components by routing requests through a centralized mediator.

The best way to implement CQRS in .NET is using the MediatR pattern to separate command and query responsibilities. This architecture divides data mutation operations from data retrieval operations, allowing distinct handlers for each request type without direct coupling.

You add cross-cutting concerns like validation to .NET request handling by implementing MediatR pipeline behaviors. Pipeline behaviors automatically execute logging, validation, or authorization steps before the target command handler processes the request.

Yes, you need to install MediatR and its dependency injection extensions to use MediatR in .NET. These packages are required to integrate the mediator pattern into your application's dependency injection container using the dotnet add package command.

You should use the mediator pattern in .NET when you need to manage complex component interactions and decouple request senders from receivers. It is particularly useful for CQRS architectures and centralizing cross-cutting concerns like logging and validation.

MediatR pipeline behaviors work by wrapping command handlers in a sequence of actions that execute before the main handler. When building a feature, you add a validation step to the pipeline that automatically runs and validates user input before the command handler is invoked.