CODEWITHSUNDEEP
c#autofac
RadioMan85
RadioMan85

Reputation: 349

How to hand over a specific parameter

Assume that I have the following classes with their interfaces

public class MyService : IMyService
{
    int _value;

    public MyService (int value)
    {
        _value = value;
    }
}


public class MyClass : IMyClass
{
    IMyService _myService;

    public MyClass(IMyService myService)
    {
        _myService = myService;
    }
}

Step 1: Setting up a constructor inside my test project using autofac:

public class Configuration : Autofac.Module
{
    protected override void Load(ContainerBuilder builder)
    {
        builder.RegisterType<MyClass>().As<IMyClass>()
            .InstancePerLifetimeScope();

        builder.RegisterType<MyService>().As<IMyService>()
            .InstancePerLifetimeScope();
    }
}

Step 2: Set up test

public class MyApplication
{
    readonly int _value = 1234;
    private MyClass _myClass;

    public MyApplication(IMyClass myClass)
    {
        _myClass = myClass;
    }
}

Now, how do I inject the parameter "value" which is unknown by the configurator but known by "MyApplication"?

Before the idea was to do this

public class MyApplication
{
    readonly int _value = 1234;
    private MyClass _myClass;

    public MyApplication()
    {
        _myService = new MyService(_value);
        _myClass = new MyClass(_myService);
    }
}

But now I am trying to us dependency inversion and dependency injection ending up in the above described problem.

Upvotes: 1

Views: 83

Answers (1)

Igor
Igor

Reputation: 62213

You have to call the constructor in the autofac configuration.

builder.Register((comCont, parameters) => new MyClass(123))
  .As<IMyClass>()
  .InstancePerLifetimeScope();

Upvotes: 2

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