CODEWITHSUNDEEP
castle-windsorioc-containerproperty-injection
Paul Stovell
Paul Stovell

Reputation: 32715

Windsor Func<T> property injection

Using Windsor 2.5.2, the following works:

public class Foo
{
    public IBar Bar { get; set; }
}

To delay creation of IBar, this also works:

public class Foo
{
    public Foo(Func<IBar> barFactory)
    { 
    }
}

However, if I combine property injection with Func<T>, the following results in a null reference:

public class Foo
{
    public Func<IBar> Bar { get; set; }
}

How can I make Windsor inject the Func<IBar>?

Upvotes: 2

Views: 873

Answers (1)

Krzysztof Kozmic
Krzysztof Kozmic

Reputation: 27374

That's a great question Paul. I'm glad you asked.

For implicitly registered Funcs Windsor is looking at the property, sees it's optional, and it just doesn't bother trying to get it, since... well - it's optional, so you surely are happy not having the dependency populated.

To have it populated, you either register the factory explicitly

container.Register(Component.For<Func<IBar>>().AsFactory().Lifestyle.Transient);

or you mark the dependency as required (on ComponentModel using Require method) which is probably best done via an IComponentModelConstructionContributor

Upvotes: 2

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