Can I use FlentValidation with WorkerService and MediatR

Which version of FluentValidation are you using? v8.6.2

Which version of ASP.NET are you using? NET Core 3.1

Describe the issue that you’re having I have a WebApi working with Angular 9 and I use FluentValidation and MediatR. It is working fine. However, I need to implement multiple worker service now. So, is there a way to using fluent validation with Dependecy Injection?

I use _validator.Validate inside my methods but I hope there will be an easy way.

using (var scope = Services.CreateScope()) {
                    var mediator =
                        scope.ServiceProvider
                            .GetRequiredService<IMediator>();
                    var context =
                        scope.ServiceProvider
                            .GetRequiredService<IMyDbContext>();
                    _validator = new UpsertCategoryCommandValidator(context);

                    var newCategory = new UpsertCategoryCommand { Name = "CategoryName" };
                    var validationResult = _validator.Validate(newCategory);
                    if (validationResult.IsValid) {
                        var result = await mediator.Send(newCategory);
                    }
                }

[JeremySkinner]

The AddFluentValidation call is specifically for adding the ASP.NET integration - if you’re not using the ASP.NET integration, then you don’t need to call this method.

Just register your validators directly with the service provider:

Either manually:

services.AddTransient<IValidator<Person>, PersonValidator>();

Or in bulk:

// This is an extension method which will need the FluentValidation.DependencyInjectionExtensions package.
services.AddValidatorsfromAssemblyContaining<PersonValidator>();

[JeremySkinner]

As I said in my example, you need to have the FluentValidation.DependencyInjectionExtensions package installed for that method to show up as it’s an extension method.

If you have problems getting it to work then let me know.

Hope that sorts everything