dotnet-fluent-validation

To validate DTOs in ASP.NET Core using FluentValidation, create validator classes deriving from AbstractValidator<T>, register them in DI using AddValidatorsFromAssemblyContaining, and apply rules to controllers or services to enforce consistent input validation.

Centralizing input validation in .NET 8 is achieved by using FluentValidation to define rules in AbstractValidator<T> classes and registering them via dependency injection, which standardizes enforcement across API controllers, services, and domain layers.

Yes, you can validate nested objects and collections in .NET by deriving validators from AbstractValidator<T> and defining rules for nested properties, ensuring invalid data is prevented from entering the domain across all layers.

You can either explicitly call ValidateAndThrow in your services or optionally add a ValidationFilter to auto-validate requests, depending on whether you want manual control or automatic enforcement during the ASP.NET Core pipeline.

FluentValidation requires dependency injection setup in .NET 8 to automatically discover and register validator classes from assemblies using DependencyInjectionExtensions, reducing boilerplate and ensuring validators are available across API controllers and services.