public class Address : ValueObject<Address>
    {
        public Guid CityId { get; private set; } //引用城市实体.

        public string Street { get; private set; }

        public int Number { get; private set; }

        public Address(Guid cityId, string street, int number)
        {
            CityId = cityId;
            Street = street;
            Number = number;
        }
    }

var address1 = new Address(new Guid("21C67A65-ED5A-4512-AA29-66308FAAB5AF"), "Baris Manco Street", 42);
var address2 = new Address(new Guid("21C67A65-ED5A-4512-AA29-66308FAAB5AF"), "Baris Manco Street", 42);

Assert.Equal(address1, address2);
Assert.Equal(address1.GetHashCode(), address2.GetHashCode());
Assert.True(address1 == address2);
Assert.False(address1 != address2);