Simple validation behavior using FluentValidation and MediatR

ValidationBehavior.cs

public class ValidatorBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
    where TRequest : IRequest<TResponse>
{
    private readonly IEnumerable<IValidator<TRequest>> _validators;

    public ValidatorBehavior(IEnumerable<IValidator<TRequest>> validators)
    {
        _validators = validators ?? throw new ArgumentNullException(nameof(validators));
    }

    public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
    {
        await Task.WhenAll(_validators.Select(v => v.ValidateAndThrowAsync(request)));
        return await next();
    }
}