xVal RuleException and Extension

xval-rules-extension.cs

    /// <summary>
    /// Rules Exception
    /// </summary>
    [Serializable]
    public class RulesException : Exception
    {
        private readonly IList<ErrorInfo> _errors;
        
        public RulesException(string propertyName, string errorMessage)
        {
            _errors = Errors;
            _errors.Add(new ErrorInfo(propertyName, errorMessage));
        }

        public RulesException(string propertyName, string errorMessage, object onObject)
        {
            _errors = Errors;
            _errors.Add(new ErrorInfo(propertyName, errorMessage, onObject));
        }

        public RulesException(IList<ErrorInfo> errors)
        {
            _errors = errors;
        }

        public IList<ErrorInfo> Errors
        {
            get
            {
                return _errors ?? new List<ErrorInfo>();
            }
        }
    }

    public class ErrorInfo
    {
        private readonly string _errorMessage;
        private readonly string _propertyName;
        private readonly object _onObject;
        
        public ErrorInfo(string propertyName, string errorMessage)
        {
            _propertyName = propertyName;
            _errorMessage = errorMessage;
            _onObject = null;
        }

        public ErrorInfo(string propertyName, string errorMessage, object onObject)
        {
            _propertyName = propertyName;
            _errorMessage = errorMessage;
            _onObject = onObject;
        }

        public string ErrorMessage
        {
            get
            {
                return _errorMessage;
            }
        }

        public string PropertyName
        {
            get
            {
                return _propertyName;
            }
        }
    }

    public static class RulesExceptionExtension
    {
        public static void AddModelStateErrors(this RulesException ex, ModelStateDictionary modelState, string prefix)
        {
            foreach (var error in ex.Errors)
            {
                modelState.AddModelError(error.PropertyName, error.ErrorMessage);
            }
        }
    }