Mediatr Features

MediatR is a popular open-source .NET library that implements the Mediator pattern to provide simple and flexible request/response handling, command processing, and event notifications while promoting loose coupling between application components.
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Key Features of Mediatr

MediatR is a lightweight .NET library that implements the Mediator pattern, providing a simple way to handle in-process messaging with no dependencies. It supports request/response patterns, commands, queries, notifications, and events, both synchronously and asynchronously. The library enables loose coupling between components and helps implement CQRS (Command Query Responsibility Segregation) architecture in .NET applications.
Pipeline Behaviors: Supports middleware-like behaviors for cross-cutting concerns such as logging, validation, and caching, allowing developers to add functionality without modifying existing code
Automatic Handler Discovery: Automatically identifies and registers handlers in the application, reducing the need for explicit configuration and simplifying setup
Multiple Message Types: Supports various types of messages including request/response, commands, queries, notifications and events with intelligent dispatching via C# generic variance
Cross-Platform Compatibility: Works across different .NET platforms including .NET Framework 4.6.1 and netstandard2.0, making it versatile for various project types

Use Cases of Mediatr

Web API Development: Ideal for building clean, maintainable ASP.NET Core APIs by separating business logic from controllers and implementing CQRS pattern
Enterprise Applications: Helps manage complexity in large-scale enterprise applications by organizing code into feature-focused modules with loose coupling
Event-Driven Systems: Facilitates building event-driven architectures by handling notifications and events within the application

Pros

Promotes clean architecture and separation of concerns
Reduces coupling between application components
Simple to implement and integrate with minimal setup

Cons

Can introduce performance overhead in high-throughput scenarios
May add unnecessary complexity for smaller applications
Limited to in-process communication only

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