Injecting Dependencies into Domain Model classes with Nhibernate (ASP.NET MVC + IOC)
- by Sunday Ironfoot
I'm building an ASP.NET MVC application that uses a DDD (Domain Driven Design) approach with database access handled by NHibernate. I have domain model class (Administrator) that I want to inject a dependency into via an IOC Container such as Castle Windsor, something like this:
public class Administrator
{
public virtual int Id { get; set; }
//.. snip ..//
public virtual string HashedPassword { get; protected set; }
public void SetPassword(string plainTextPassword)
{
IHashingService hasher = IocContainer.Resolve<IHashingService>();
this.HashedPassword = hasher.Hash(plainTextPassword);
}
}
I basically want to inject IHashingService for the SetPassword method without calling the IOC Container directly (because this is suppose to be an IOC Anti-pattern). But I'm not sure how to go about doing it. My Administrator object either gets instantiated via new Administrator(); or it gets loaded via NHibernate, so how would I inject the IHashingService into the Administrator class?
On second thoughts, am I going about this the right way? I was hoping to avoid having my codebase littered with...
currentAdmin.Password = HashUtils.Hash(password, Algorithm.Sha512);
...and instead get the domain model itself to take care of hashing and neatly encapsulate it away. I can envisage another developer accidently choosing the wrong algorithm and having some passwords as Sha512, and some as MD5, some with one salt, and some with a different salt etc. etc. Instead if developers are writing...
currentAdmin.SetPassword(password);
...then that would hide those details away and take care of those problems listed above would it not?
