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POStructureMap Constructor Injection without Interface?
 

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  1. POStructureMap Constructor Injection without Interface?
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    <p>I'm setting up a MVC project. It looks like this</p> <pre><code>EfDbContext : IDbContext { ... } MyStuff : IMyStuff { ... } MyService : IMyService { List&lt;things&gt; GetSomething(IDbContext context, IMyStuff stuff) { ... } } MyController : Controller { ActionResult MyAction(IMyService service) { ... } } </code></pre> <p>I use StructureMap.MVC to resolve all the constructor dependencies, plus setter injection for auditing and logging in custom ActionFilters. The only thing I have to manually specify in the IoC is the connection string for IDbContext, everything else just automagically worked!</p> <p>Until I read some <a href="http://blog.ploeh.dk/2010/12/02/Interfacesarenotabstractions/" rel="nofollow">articles</a> that says, it smells to have 1:1 ratio between class and interface. My application is quite simple, there will never be different implementation of IMyStuff or IMyService. The only reason I have them is so that they can be injected and unit tested (I used Rhino but start to like NSubstitue).</p> <p>Is there way I can get rid of the interface and inject the concrete class directly? So it looks like </p> <pre><code>GetSomething(IDbContext context, MyStuff stuff) {} MyAction(MyService service) {} </code></pre> <p>Of course, I still want all the convention based auto wiring with StructureMap, so I don't have to specify them one by one.</p> <p>Thanks.</p>
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    1. COUpon further testing, it seems StructureMap.MVC has no problem injecting anything. The concrete class in constructor parameters are injected without even manually config. But mocking during test seems to be the problem. Without interface, I have to mark all method virtual, and also specify constructor parameters in test. There are some arguments about this making test more vulnerable. Any suggestions? Thanks
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    2. COAs I understand it, you shouldn't just replace interfaces with concrete classes because having a 1:1 ratio of interfaces and classes is bad. What I hear Mark saying is that having a 1:1 ratio means that you have an architectural problem in your application, using poor abstractions. Read his [follow up post](http://blog.ploeh.dk/2010/12/03/Towardsbetterabstractions/) for some examples on how to improve the design.
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    3. COThanks for the follow up. That's the exact article that bring me to the question. My applications are usually simple, there will never be a different implementation of the same service. Even the IDbContext, I have no intention of having anything other than EfDbcontext. So the interfaces are there just for IoC and Unit test mocking, rather than abstraction. I read about you can mark everything virtual and mock the class, but there are disagreement there too. So I'm not really sure what I can do differently.
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