namespace ConsoleApp1

{

    public interface IValidatable

    {

        bool ValidateTo(ErrorList errors, params object[] blabla);

    }

​

    public delegate ValidationArgs PreValidationSuccessful();

​

    public class ValidationArgs

    {

        public ErrorList ErrorList { get; set; }

        public object[] Args { get; set; }

        public bool ProcessValidation { get; set; }

    }

​

    public interface IValidatableWithConditions : IValidatable

    {

        bool ValidateWithConditions(PreValidationSuccessful preValidationDelegate);

    }

​

    public abstract class ValidatableWithConditions : IValidatableWithConditions

    {

        public bool ValidateWithConditions(PreValidationSuccessful preValidationDelegate)

        {

            var prereqs = preValidationDelegate.Invoke();

            if (prereqs.ProcessValidation)

            {

                return this.ValidateTo(prereqs.ErrorList, prereqs.Args);

            }

            return false;

        }

​

        public abstract bool ValidateTo(ErrorList errors, params object[] blabla);

    }

​

    public class ErrorList { }

}