Castle Windsor - Removing or changing a registered instance

Question

I want to change the registered instance with another instance created at runtime.

This can be removing existing component and re-registering the new one, or just reassigning the newly created instance to the registered one.

Foo old = new Foo("asd");
IoC.Register(Component.For<IFoo>().Instance(old));

Foo new = new Foo("qwe");
IoC.Unregister(old); // RemoveComponent method is removed from IKernel after v3.0
IoC.Register(Component.For<IFoo>().Instance(new));

Is there a way to do that? Please do not suggest other ideas such as "re-intialize your IoC container" etc.

Possible duplicate: http://stackoverflow.com/questions/9253388/in-castle-windsor-3-override-an-existing-component-registration-in-a-unit-test — Andrew Shepherd, Feb 06 '17 at 00:34

stuartd · Accepted Answer · 2013-09-18T23:16:08.197

5

If you have to do this more than once, you could consider registering IFoo with UsingFactoryMethod and Lifestyle.Transient, so each time you get an instance it uses the latest parameters:

Component.For<IFoo>().UsingFactoryMethod(GetLatestFoo).Lifestyle.Transient

...


private IFoo GetLatestFoo()
{
    return new Foo(...)
}

edited Sep 18 '13 at 23:16

answered Sep 17 '13 at 11:03

stuartd

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This one was useful, also added "managedExternally: true" parameter to UsingFactoryMethod() to return singleton object which I reinstantiate whenever I want. A bit dirty solution though :) – Mert Akcakaya Sep 17 '13 at 11:52

score 2 · Answer 2 · edited May 23 '17 at 10:29

2

See this answer: https://stackoverflow.com/a/16832183/4593944

Register the new component with IsDefault and it becomes the preferred resolver.

If you already have a container with instances that you want to reset, usually singletons, just call Dispose on container.

edited May 23 '17 at 10:29

Community

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answered Oct 09 '15 at 20:19

Daniel Reis

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score 1 · Answer 3 · answered Sep 17 '13 at 10:48

1

You need to use an IHandlerSelector.

answered Sep 17 '13 at 10:48

Crixo

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This example talks about switching from one implementation to another. In my code, I am using the same implementation, Foo, but want it to be reinstantiated with different parameters. – Mert Akcakaya Sep 17 '13 at 10:59
Ok. Understood. You may consider also a TypedFactory w/ a custom ITypedFactoryComponentSelector.http://docs.castleproject.org/Windsor.Typed-Factory-Facility-interface-based-factories.ashx?HL=typedfactory – Crixo Sep 17 '13 at 12:14

Castle Windsor - Removing or changing a registered instance

3 Answers3