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    <p>Even if you don't use a distinct service layer, you can accomplish what you want, which is to decouple the MVC application from the DAL project using DI.</p> <p>The way to do this is to add a couple of projects/assemblies in between that wires up your IoC container with specific instances of the interfaces you have defined.</p> <p>I typically use this naming convention: </p> <ul> <li><p>MyCompany.MyProject.Infrastructure </p></li> <li><p>MyCompany.MyProject.Abstract</p></li> </ul> <p>Your main MVC project would then have a reference to your Abstract and Infrastructure projects. Your Infrastructure project would have a reference to the Abstract and instance specific projects like the Business and DAL projects. Within Infrastructure project you wire up the dependencies.</p> <p>You'll have to setup a mechanism for your MVC project to bootstrap your IoC in the Infrastructure assembly. You can do that in your global.asax or as an App_Start method and call a Registration class within your Infrastructure assembly.</p> <p>We use StructureMap, but the concept is the same. Here's some sample code.</p> <p>In your MVC App, create a App_Start method to setup the DI.</p> <pre><code>public static class StructuremapMvc { public static void Start() { // Create new Structuremap Controller factory so Structure map can resolve the parameter dependencies. ControllerBuilder.Current.SetControllerFactory(new StructuremapControllerFactory()); IContainer container = IoC.Initialize(); DependencyResolver.SetResolver(new StructureMapDependencyResolver(container)); GlobalConfiguration.Configuration.DependencyResolver = new StructureMapDependencyResolver(container); } } </code></pre> <p>In your Infrastructure assembly, wire up the dependencies.</p> <pre><code>public static class IoC { public static IContainer Initialize() { ObjectFactory.Initialize(x =&gt; { x.Scan(scan =&gt; { scan.TheCallingAssembly(); scan.WithDefaultConventions(); }); x.For&lt;IRepositoryNum1&gt;().Use&lt;Num1Repository&gt;(); x.For&lt;IRepositoryNum2&gt;().Use&lt;Num2Repository&gt;(); x.For&lt;IRepositoryNum3&gt;().Use&lt;Num3Repository&gt;(); }); return ObjectFactory.Container; } } </code></pre>
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    1. COOk, this infrastructure is like the service layer described by Alwyn, but without DTOs, am I right? This approach looks very good to me, I will test it.
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    2. COYes, this approach can be used with or without a service layer and associated DTOs.
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