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    <p>Full disclosure: I've never used StructureMap before, so I could be misunderstanding how it's intended to be used. But as near as I can tell, either this use-case is intentionally not supported by StructureMap, or it's a bug. </p> <p>But first, you have one error; you need to fix your <code>id</code> to match your <code>.ToUpper</code> call (i.e. it should be <code>var id = "TESTEVENT";</code>, not <code>var id = "TestEvent";</code>). </p> <p>Once you've done that, though, it still doesn't work. Inspecting the source code, it's clear why. The constructor of the types are inspected (in this case, <code>TestEvent</code>) and if any constructor declares a parameter whose type is "simple" (i.e. primitives, strings, etc.) then that constructor is categorically disqualified from participating in the <code>.GetInstance</code> behavior. </p> <p>Specifically, if you examine <code>StructureMap.Graph.PluginFamily.discoverImplicitInstances()</code>:</p> <pre><code>private void discoverImplicitInstances() { _pluggedTypes.Each((key, plugin) =&gt; { if (!plugin.CanBeAutoFilled) return; if (hasInstanceWithPluggedType(plugin)) return; ConfiguredInstance instance = new ConfiguredInstance(plugin.PluggedType).WithName(key); FillInstance(instance); }); } </code></pre> <p>It's that first line in the lambda that is the culprit:</p> <pre><code>if (!plugin.CanBeAutoFilled) return; </code></pre> <p>That's the line that is disqualifying your constructor (and thus your type). Strings can't be "auto-filled" since you can't just new one up, and they wouldn't be registered for injection.</p> <p>If you comment that line out your code will now work. What puzzles me is that while I understand why your constructor couldn't be <em>implicitly</em> created, the code as written seems to also disqualify code from working when you are passing <em>explicit</em> arguments as you've done.</p> <p>Maybe someone with more experience with StructureMap will be able to offer more expert guidance, but hopefully this was better than nothing.</p>
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    1. USKirk Woll
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    1. COThanks for catching the typo Kirk, and for the great explanation. I'll cross-post on the StructureMap google group as well. In the meantime, I'll try creating a simple wrapper object to work around this.
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