MediatR Pattern

Overview

MediatR is a mediator pattern implementation that enables decoupled request handling in .NET. This skill should be invoked when implementing CQRS, needing decoupled handlers, or requiring pipeline behaviors for cross-cutting concerns.

Core Principles

• Mediator Pattern: Decouple senders from receivers
• Request/Handler: Each request has one handler
• Pipeline Behaviors: Add cross-cutting concerns (logging, validation)
• Notification Patterns: Support for publish/subscribe

Preparation Checklist

• Install MediatR: dotnet add package MediatR
• Install DI extensions: dotnet add package MediatR.Extensions.Microsoft.DependencyInjection
• Plan request/command structure
• Configure in Program.cs