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POStructure Map Generic Type Scanner
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  1. POStructure Map Generic Type Scanner
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    copied!<p><strong>High Level</strong></p> <p>With StructureMap, Can I define a assembly scan rule that for an interface <code>IRequestService&lt;T&gt;</code> will return the object named TRequestService</p> <p>Examples:</p> <ul> <li><code>FooRequestService</code> is injected when <code>IRequestService&lt;FooRequest&gt;</code> is requested</li> <li><code>BarRequestService</code> is injected when <code>IRequestService&lt;BarRequest&gt;</code> is requested</li> </ul> <p><strong>Details</strong></p> <p>I have a generic interface defined</p> <pre><code>public interface IRequestService&lt;T&gt; where T : Request { Response TransformRequest(T request, User current); } </code></pre> <p>and then I have multiple Request objects that implement this interface</p> <pre><code>public class FooRequestService : IRequestService&lt;Foo&gt; { public Response TransformRequest(Foo request, User current) { ... } } public class BarRequestService : IRequestService&lt;Bar&gt; { public Response TransformRequest(Bar request, User current) { ... } } </code></pre> <p>Now I am at the point where I need to register these classes so that StructureMap knows how to create them because in my controller I want have the following ctor (which I want StructureMap to inject a <code>FooRequestService</code> into)</p> <pre><code>public MyController(IRequestService&lt;Foo&gt; fooRequestService) { ... } </code></pre> <p>Right now to get around my issue I have implemented an empty interface and instead of having the <code>FooRequestService</code> implement the generic interface I have it implement this empty interface</p> <pre><code>public interface IFooRequestService : IRequestService&lt;Foo&gt; { } </code></pre> <p>Then my controllers ctor looks like so, which works with StructureMaps' Default Convention Scanner</p> <pre><code>public MyController(IFooRequestService fooRequestService) { ... } </code></pre> <p>How could I create a rule with StructureMap's assembly scanner to register all objects named TRequestService with <code>IRequestService&lt;T&gt;</code> (where T = "Foo", "Bar", etc) so that I don't have to create these empty Interface definitions?</p> <p>To throw something else into the mix, where I am handling StructureMap's assembly scanning does not have any reference to the assembly that defines <code>IRequestService&lt;T&gt;</code> so this has to use some sort of reflection when doing this. I scanned the answer to "<a href="https://stackoverflow.com/questions/516892/structuremap-auto-registration-for-generic-types-using-scan">StructureMap Auto registration for generic types using Scan</a>" but it seems as though that answer requires a reference to the assembly that contains the interface definition.</p> <p>I am on the path of trying to write a custom StructureMap.Graph.ITypeScanner but I am kind of stuck on what to do there (mainly because I have little experience with reflection).</p>
 

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