Using MediatR in ASP.NET Core

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Using MediatR in ASP.NET Core

MediatR is a popular library in .NET that implements the Mediator Pattern, promoting loose coupling by enabling communication between components without direct dependencies. In ASP.NET Core, it helps keep controllers thin and business logic clean by sending requests to handlers rather than calling services directly.

With MediatR, you define Requests (Commands or Queries) and their respective Handlers. A Controller action sends a request through IMediator.Send(), and the library routes it to the correct handler. This improves maintainability, testability, and separation of concerns.

Key Benefits:

Decoupling: Reduces tight coupling between layers.

Single Responsibility: Handlers focus on one task.

Scalability: Easy to extend with behaviors like logging or validation.

Example Setup:

Install MediatR and MediatR.Extensions.Microsoft.DependencyInjection.

Create a request class implementing IRequest<TResponse>.

Create a handler class implementing IRequestHandler<Request, TResponse>.

Register services in Program.cs:

csharp

builder.Services.AddMediatR(typeof(Program));

Inject IMediator in controllers and use await _mediator.Send(request);.

MediatR helps structure ASP.NET Core applications into clean, testable, and maintainable codebases—perfect for CQRS and enterprise-grade projects. 

Read More

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SignalR in ASP.NET Core for Real-time Apps

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