namespace MongoProject.Domain.Common { public abstract class ValueObject { protected static bool EqualOperator(ValueObject left, ValueObject right) { if (left is null ^ right is null) { return false; } return ReferenceEquals(left, right) || left.Equals(right); } protected static bool NotEqualOperator(ValueObject left, ValueObject right) { return !(EqualOperator(left, right)); } protected abstract IEnumerable GetEqualityComponents(); public override bool Equals(object obj) { if (obj == null || obj.GetType() != GetType()) { return false; } var other = (ValueObject)obj; return this.GetEqualityComponents().SequenceEqual(other.GetEqualityComponents()); } public override int GetHashCode() { return GetEqualityComponents() .Select(x => x != null ? x.GetHashCode() : 0) .Aggregate((x, y) => x ^ y); } // Other utility methods } }