MessageValidator.cs

    public abstract class MessageValidator<IRequest>
    {
        private readonly DataAnnotationsValidator _dataAnnotationsValidator;
        protected ValidationResult _result;

        protected MessageValidator()
        {
            _dataAnnotationsValidator = new DataAnnotationsValidator();
            _result = new ValidationResult();
        }

        public bool ValidateAnnotations(IRequest message)
        {
            List<System.ComponentModel.DataAnnotations.ValidationResult> dataAnnotationValidationResults;

            var success = _dataAnnotationsValidator.TryValidate(message, out dataAnnotationValidationResults);

            AddDataAnnotationValidationResultsToValidationResultObject(dataAnnotationValidationResults);

            return success;
        }

        private void AddDataAnnotationValidationResultsToValidationResultObject(
            List<System.ComponentModel.DataAnnotations.ValidationResult> dataAnnotationValidationResults)
        {
            foreach (var item in dataAnnotationValidationResults)
            {
                _result.AddError(new ValidationFailure(item.MemberNames.FirstOrDefault(), item.ErrorMessage));
            }
        }

        public abstract ValidationResult Validate(IRequest message);
    }