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POError passing constructor args to StructureMap named instance
 

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  1. POError passing constructor args to StructureMap named instance
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    <p>I have an object:</p> <pre><code>public class TestEvent : IEvent { private string _id; public TestEvent() { } public TestEvent(string eventId) { _id = eventId; } } </code></pre> <p>And I have a StructureMap registry:</p> <pre><code>public class TheRegistry : Registry { public TheRegistry() { Scan(_ =&gt; { _.TheCallingAssembly(); _.AddAllTypesOf&lt;IEvent&gt;().NameBy(t =&gt; t.Name.ToUpper()); }); } } </code></pre> <p>I'm trying to get a named instance of IEvent using the StructureMap container and passing in a constructor argument for "eventId":</p> <pre><code>var id = "TESTEVENT"; var args = new ExplicitArguments(); args.SetArg("eventId", id); var eventInstance = _container.GetInstance&lt;IEvent&gt;(args, id); </code></pre> <p>I <em>think</em> the docs suggest it should work, however I'm getting an ArgumentNullException: </p> <blockquote> <p>{"Trying to find an Instance of type MyProject.IEvent, MyProject, Version=1.0.0.0, Culture=neutral, publicKeyToken=null\r\nParameter name: instance"} </p> </blockquote> <p>All the code works properly if I remove the second constructor, and just grab the named instance.</p> <p><strong>UPDATE:</strong></p> <p>Following Kirk's investigation, I've been able to workaround this "issue" by creating a simple object to hold any required arguments. It works now.</p> <pre><code>public class EventArguments { public string EventId { get; set; } } ... var eventName = Context.Parameters.EventTypeName.ToString().ToUpper(); var args = new ExplicitArguments(); args.SetArg("args", new EventArguments { EventId = eventName }); var eventInstance = _container.GetInstance&lt;IEvent&gt;(args, eventName); </code></pre>
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    1. COSaw your edit -- nice idea. I find myself using that technique a lot when using DI.
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      1. USKirk Woll
    2. COWhat version of Structuremap are you using? I'm on 2.6.4, and GetInstance doesn't have an overload that takes 2 arguments
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      1. USCocowalla
 

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