Making Microsoft Unity dependency properties available in constructors

Question

I've got the following bit of (simplified) code:

public abstract class BaseClass
{
  [Dependency]
  public IRequiredService RequiredService { get; set; }

  protected string RequiredParameter { get; private set; }

  public BaseClass(string requiredParameter)
  {
    this.RequiredParameter = requiredParameter;
  }
}

public class DerivedClass : BaseClass
{
  public DerivedClass(string requiredParameter) : base(requiredParameter)
  {
    RequiredService.DoSomething(); //this will fail!
  }
}

In other words, I'd like to have access to the Unity-filled RequiredService in the constructor... but that's impossible, since that property hasn't been filled by Unity yet. I COULD add the IRequiredService as a required constructor parameter, but then I'd need to refactor every constructor of every derived class to also include that parameter.

I was wondering if there's a better way.

In short, I'd like to run a bit of code after a class has been constructed and after unity has filled all the class' properties marked with the [Dependency] attribute.

Is there a simple way to do this?

Have you considered putting RequiredService.DoSomething(); inside a [InjectionMethod] call instead of the constructor? — Scott Chamberlain
– Scott Chamberlain, Commented Apr 6, 2017 at 15:30
@ScottChamberlain Excellent suggestion. I must have missed that attribute. Feel free to turn this into an official answer, and I'll accept it. — MBender
– MBender, Commented Apr 7, 2017 at 7:57

Scott Chamberlain · Accepted Answer · 2017-04-07 13:30:21Z

1

Instead of putting RequiredService.DoSomething(); in the constructor you can put it in a inside a [InjectionMethod] call, this will allow you to reliably know that RequiredService has been populated.

answered Apr 7, 2017 at 13:30

Scott Chamberlain

128k37 gold badges299 silver badges448 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Making Microsoft Unity dependency properties available in constructors

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related