MediatR Pipeline Behavior, FluentValidation and IExceptionHandler

Handling Validation Exceptions in ASP.NET Core the Right Way


Next, in the .NET 8 Series, we are going to learn about Validation Handling in CQRS-based ASP.NET Core applications.

I combined MediatR Pipeline Behavior, FluentValidation, and IExceptionHandler to build a super robust mechanism to seamlessly handle validation exceptions in your application pipeline.

  1. FluentValidation helps you separate your validation rules away from your domain entity.

  2. MediatR Pipeline Behavior detaches the validation logic from your application logic. It helps validate the request even before it hits your actual business code!

  3. IExceptionHandler is a super clean way to catch validations and produce a standardized response, which is ProblemDetails!

We will build an entire ASP.NET Core 8 Web API and implement this pattern! The source code is available on my website.

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Until next time.

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