Hi,

I know that NHibernate requires a default no parameter constructor to create the session factory and make an object of the class. But what about objects with dependencies. Like Order must have a Customer.

So, I cannot perform the Constructor Dependency:

public Order(Customer customer)
{
_customer = customer;
}

However, I can perform Setter Dependency. Any thoughts on how to perform Constructor dependency for some entity classes.

You can have as many overloaded constructors as you wish -- NHibernate does not use them. When loading an entity from database, NHibernate instantiate an instance using the default constructor and set the properties according to the mapping file.

If it is more convenient for you to have the constructor overloaded, by all means do so.

Hi,

Thanks for the reply. But what if my entity class does not expose a parameterless constructor. NHibernate will fail because it looks for the parameterless constructor to create an object through reflection.

It is one of the few requirements imposed by NHibernate -- your entity class must have a default constructor; it can be private though. It makes some design purist cringe. However, the alternative is to write one's own data access code. Having a private default constructor is not so bad in my opinion.

Thanks!

I did not know about the Private Constructor. I thought NHibernate require a public default constructor. Yeah! private constructor sounds good!