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POPrevent Ninject from calling Initialize multiple times when binding to several interfaces
 

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  1. POPrevent Ninject from calling Initialize multiple times when binding to several interfaces
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    <p>We have a concrete singleton service which implements <code>Ninject.IInitializable</code> and 2 interfaces. Problem is that services Initialize-methdod is called 2 times, when only one is desired. We are using .NET 3.5 and Ninject 2.0.0.0.</p> <p>Is there a pattern in Ninject prevent this from happening. Neither of the interfaces implement <code>Ninject.IInitializable</code>. the service class is: </p> <pre><code>public class ConcreteService : IService1, IService2, Ninject.IInitializable { public void Initialize() { // This is called twice! } } </code></pre> <p>And module looks like this:</p> <pre><code>public class ServiceModule : NinjectModule { public override void Load() { this.Singleton&lt;Iservice1, Iservice2, ConcreteService&gt;(); } } </code></pre> <p>where Singleton is an extension method defined like this:</p> <pre><code> public static void Singleton&lt;K, T&gt;(this NinjectModule module) where T : K { module.Bind&lt;K&gt;().To&lt;T&gt;().InSingletonScope(); } public static void Singleton&lt;K, L, T&gt;(this NinjectModule module) where T : K, L { Singleton&lt;K, T&gt;(module); module.Bind&lt;L&gt;().ToMethod(n =&gt; n.Kernel.Get&lt;T&gt;()); } </code></pre> <p>Of course we could add bool initialized-member to ConcreteService and initialize only when it is false, but it seems quite a bit of a hack. And it would require repeating the same logic in every service that implements two or more interfaces.</p> <hr> <p>Thanks for all the answers! I learned something from all of them! (I am having a hard time to decide which one mark correct).</p> <p>We ended up creating IActivable interface and extending ninject kernel (it also removed nicely code level dependencies to ninject, allthough attributes still remain). </p>
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    1. CODoesnt IStartable get called multiple times same as Initializable? (Maybe it doesnt...)
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      1. USRuben Bartelink
    2. COIt did, at least the way described in this question.
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    3. COBTW v3 has a [cleaner interface for binding multiple interfaces on an type](http://www.planetgeek.ch/2011/12/30/new-features-and-changes-of-ninject-3-0/) (Though I'm not sure if it addresses the multiple-`IInitializ`ation issue. If anyone needs the answer, I suggest asking a new question and no doubt @Remo Gloor will pounce on it!
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