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POCircular dependencies in StructureMap - can they be broken with property injection?
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  1. POCircular dependencies in StructureMap - can they be broken with property injection?
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    copied!<p>I've got the simplest kind of circular dependency in structuremap - class A relies on class B in its constructor, and class B relies on class A in its constructor. To break the dependency, I made class B take class A as a property, rather than a constructor argument, but structuremap still complains.</p> <p>I've seen circular dependencies broken using this method in other DI frameworks - is this a problem with Structuremap or am I doing something wrong?</p> <p><b>Edit:</b> I should mention that class B's property is an array of class A instances, wired up like this:</p> <pre><code>x.For&lt;IB&gt;().Singleton().Use&lt;B&gt;().Setter(y =&gt; y.ArrayOfA).IsTheDefault(); </code></pre> <p>Just to clarify, I want the following sequence of events to occur:</p> <ul> <li>Construct an instance of B, "b"</li> <li>Construct an instance of A, "a", injecting "b" into its constructor</li> <li>Set "b.ArrayOfA" to ["a"]</li> </ul> <p>And I want all this to happen using autowiring, if possible... </p> <p><b>Edit 2:</b> Here's a simplified example that uses explicit wiring up:</p> <pre><code>interface ILoader { } interface ILoaderManager { } class Loader : ILoader { public Loader(ILoaderManager lm) { } } class LoaderManager : ILoaderManager { public ILoader Loader { get; set; } // Was an array, but same circular dependency appears here } ObjectFactory.Configure ( x =&gt; { x.For&lt;ILoader&gt;.Singleton().Use&lt;Loader&gt;(); x.For&lt;ILoaderManager&gt;().Singleton().Use&lt;LoaderManager&gt;().OnCreation((c, a) =&gt; a.Loader = c.GetInstance&lt;ILoader&gt;()); } ); </code></pre> <p>Validating the configuration causes "Bidirectional Dependency Problem detected with RequestedType: IocTest2.ILoader..."</p>
 

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