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PODependency Injection for DataContracts and Models in the BLL
 

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    <p>Apologies if this has been asked before. I was unable to find similar question or post.</p> <p>I have a solution with Unity as DI Framework.</p> <p>I have very recently tried to understand the concept of TDD and DI. This hopefully should be the last question before I now actually move things into my real application.</p> <p>I understand the concept of injecting dependency via constructor, this is how my BLL looks like now:</p> <p>The BLL Class Called <strong>CarService</strong>, with one method <strong>GetCarDetails</strong>:</p> <pre><code>class CarService { IRepository repository; CarService(IRepository repository) { this.repository = repository; } CarResponse GetCarDetails(CarRequest request) { CarResponse carResponse = new CarResponse(); CarModel car = this.repository.SelectCarById(request.CarId); if(car!=null) { carResponse.Make = car.Make; carResponse.Reg = car.Reg; } return carResponse; } } </code></pre> <p>Using the Composition Root (CR) suggestion in <a href="https://stackoverflow.com/questions/9501604/ioc-di-why-do-i-have-to-reference-all-layers-assemblies-in-entry-application">this question</a> I am using my WebAPi project as CR project. I wanted all my projects to be only referred in CR as suggested in that question and <a href="http://blog.ploeh.dk/2011/07/28/CompositionRoot/" rel="nofollow noreferrer">here</a></p> <p>How ever as in above example code, I'll need to have a reference to my DataContracts and Model Project in CarService to do:</p> <pre><code>CarResponse carResponse = new CarResponse(); CarModel car = this.repository.SelectCarById(request.CarId); </code></pre> <p>and to accept CarRequest as method parameter.</p> <p>Is that okay to do that? (this will mean that DataContracts and Model project is not just referenced by CR but also CarService)</p> <p>or should this also be resolved by some sort of DI technique. If so, how?</p>
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