MVCLogin/VCart.Domain/ValueObjects/DateBirth.cs

using BaseDomain;
using System;
using System.Diagnostics.Metrics;
using System.IO;
using System.Reflection.Emit;

namespace VCart.Domain
{
    public class DateBirth : AValueObject
    {
        public DateTime Value { get; private set; }

        public DateBirth(string dateOfBirth)
        {
            DateTime dateAsDate;
            if (dateOfBirth!=null && (DateTime.TryParse(dateOfBirth, out dateAsDate) || dateAsDate > DateTime.Now))
            {
                this.Value = dateAsDate;
                this.IsValid = true;
            }
            else
            {
                this.IsValid = false;
            }
        }

        public DateBirth(DateTime dateOfBirth)
        {
            if (dateOfBirth > DateTime.Now)
            {
                this.IsValid = false;
            }
            this.Value = dateOfBirth;
        }

        public int YearsOld { 
            get
            {
                var age = DateTime.Now.Year - this.Value.Year;
                if (this.Value.Date > DateTime.Now.AddYears(-age)) age--;
                return age;
            }
        }

        public static implicit operator string(DateBirth d) => d.Value.ToString("pt-BR");
        public static explicit operator DateBirth(DateTime b) => new DateBirth(b);
        public static explicit operator DateBirth(string b) => new DateBirth(b);

        protected override IEnumerable<object> GetEqualityComponents()
        {
            yield return Value;
        }

        public override bool GetValidationExpression()
        {

            if (this.Value > DateTime.Now)
            {
                this.IsValid = false;
            }

            return this.IsValid;
        }
    }
}