Mediatr Howto
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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Install Required NuGet Packages: Add the MediatR and MediatR.Extensions.Microsoft.DependencyInjection NuGet packages to your .NET project
Configure MediatR in Startup: Add MediatR to the service collection in ConfigureServices method using services.AddMediatR() to register handlers automatically
Create Request Class: Create a class that implements either IRequest (for commands with no return value) or IRequest<T> (for queries that return data)
Create Handler Class: Create a handler class that implements IRequestHandler<TRequest> or IRequestHandler<TRequest,TResponse> and implements the Handle method
Inject IMediator: Inject IMediator interface into your controllers or services where you need to send requests
Send Requests: Use the injected IMediator to send requests using Send() for request/response or Publish() for notifications
Optional: Add Behaviors: Implement pipeline behaviors for cross-cutting concerns like logging, validation, and authorization using IPipelineBehavior<TRequest,TResponse>
Mediatr FAQs
MediatR is a .NET library that implements the mediator pattern, helping to decouple application logic from the presentation layer. It's commonly used in ASP.NET Core applications to manage in-process communication between components.
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