What is the difference between DependencyResolver.SetResolver and HttpConfiguration.DependencyResolver in WebAPI

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Prevent mixing MVC and Web API in the same project. Microsoft seems to suggest this, because the Visual Studio template for Web API mixes the project automatically with MVC, but this is a bad idea.

From an architectural point of view, MVC and Web API are completely different. MVC is a UI technology aimed to optimize end user experience. Web API is a web service technology that is aimed to optimize the experience for the (client) developer.

MVC and Web API don’t share any presentation specific code. Mixing them in the same project just makes that project bigger and more complicated.

But perhaps even more importantly, both application types have their own DI configuration needs. They have their own Composition Root and mixing that into a single DI configuration (a single DI container) can make your configuration extraordinary hard.

And last, mixing Web API with MVC in the same project leads to painful ambiguous naming conflicts, since Web API assemblies contains a lot of classes that share the exact same name as MVC counterparts (but with slightly different implementations).

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