How to make Ninject choose a specific constructor without using InjectAttribute?

Question

1) Is there a way to make Ninject select a specific constructor in code other than applying the InjectAttribute?

2) Also, how do I supply values for these arguments of the constructor?

3) Can I override these argument values on resolution or creation of the object, i.e. when I call kernel.Get<T>()?

See http://stackoverflow.com/a/12683042/684096 – BatteryBackupUnit Feb 10 '16 at 07:16 — BatteryBackupUnit, Feb 10 '16 at 07:16

score 1 · Answer 1 · answered Feb 10 '16 at 07:21

There's the ToConstructor binding method:

Bind<IMyService>().ToConstructor(
    ctorArg => new MyService(ctorArg.Inject<IFoo>()));

You can specify values on binding using 3 mechanisms:

create a binding for the dependency (Bind<IFoo>().To<Foo>())
specify a constructor argument (add a WithConstructorArgument(typeof(IFoo), new Foo()) to the end of the binding)
if i remember correctly, you can also specify it in the ToConstructor syntax like ToConstructor(ctorArg => new MyService(myFoo));

You can specify values on resolution by passing a ConstructorArgument or, preferrably, a TypeMatchingConstructorArgument (or some custom IParameter) to the resolution:

IResolutionRoot.Get<IMyService>(new TypedConstructorArgument(
    typeof(IFoo),
    (ctx, target) => myFooInstance));

1 Answers1