Entity with Validator Sample

4.Post.DomainNotification.Entity.cs

public abstract class Entity
{
	public Guid Id { get; protected set; }
	public bool Valid { get; private set; }
	public bool Invalid => !Valid;
	public ValidationResult ValidationResult { get; private set; }

	public bool Validate<TModel>(TModel model, AbstractValidator<TModel> validator)
	{
		ValidationResult = validator.Validate(model);
		return Valid = ValidationResult.IsValid;
	}
}

5.Post.DomainNotification.Customer.cs

public class Customer : Entity
{
	public string Name { get; }
	public string Email { get; }

	public Customer(string name, string email)
	{
		Id = Guid.NewGuid();
		Name = name;
		Email = email;

		Validate(this, new CustomerValidator());
	}
}

6.Post.DomainNotification.CustomerValidator.cs

public class CustomerValidator : AbstractValidator<Customer>
{
	public CustomerValidator()
	{
		RuleFor(a => a.Email)
			.NotEmpty()
			.EmailAddress()
			.WithMessage("Invalid email");

		RuleFor(a => a.Name)
			.NotEmpty()
			.WithMessage("Name cannot be empty");
	}
}