Centeva Request Validation

Centeva.RequestAuthorization is a .NET library that provides a method for validating MediatR requests using FluentValidation. This enables validation at the request level instead of inside ASP.Net Core controllers, separating validation logic from the presentation layer.

Built With

• .NET
• MediatR
• FluentValidation

Installation

Import the Centeva.RequestValidation package to your projects where needed.

Dependency Injection

Register the validators and add a MediatR pipeline behavior in your Program.cs:

builder.Services.AddRequestValidation(typeof(SampleValidator).Assembly);

NOTE: If you're also using Centeva.RequestAuthorization, you likely want to call the above method first, then add the Authorization behavior. This ensures that validation happens first in your MediatR pipeline.

Validating a Request

To validate a request, add a validator class to your project that inherits from AbstractValidator<TRequest>, where TRequest is the type of request you want to validate. For example:

public class SampleValidator : AbstractValidator<SampleRequest> { public SampleValidator() { RuleFor(x => x.Name).NotEmpty(); } }

If validation fails, a ValidationException will be thrown. Your application is responsible for handling those exceptions, possibly by mapping to a custom HTTP response or a ProblemDetails object.

Validating with Result Types

If your request handler returns a Result or Result<T> type (from the Ardalis.Result library), then validation failures will be returned as an invalid Result containing the validation errors instead of a thrown exception. This allows you to handle validation errors in a more functional style, without relying on exceptions for control flow.