validation pipeline using ErrorOr package

public class ValidationBehaviour<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> 
    where TRequest : IRequest<TResponse>
    where TResponse : IErrorOr
{
    private readonly IValidator<TRequest>? _validator;

    public ValidationBehaviour(IValidator<TRequest>? validator)
    {
        _validator = validator;
    }

    public async Task<TResponse> Handle(
        TRequest request,
        RequestHandlerDelegate<TResponse> next,
        CancellationToken cancellationToken)
    {
        if (_validator == null)
        {
            return await next();
        }
        
        ValidationResult? validationResult = await _validator.ValidateAsync(request, cancellationToken);
        
        if (validationResult.IsValid)
        {
            return await next();
        }

        var errors = validationResult.Errors
            .ConvertAll(validationFailure =>
                Error.Validation(
                    validationFailure.PropertyName,
                    validationFailure.ErrorMessage));
        
        return (dynamic)errors;
    }
}