Blog: Dependency Injection

Avoid wrongly scoped injections with a custom Ninject kernel

October 22, 2015, (updated on February 19, 2016), Software Development

I’m currently working on a large project where different teams implement assemblies which are consumed by other teams. We use Ninject for dependency injection: Each assembly has a Ninject module class which registers the available interface-to-implemenation bindings. At the moment, the consumers of these assemblies just know what module classes to load and what interfaces to inject into own objects like ASP.NET controllers or own service objects, but nothing about the scope of the injected objects. Recently we had some nasty runtime errors, because a consumer of one of these assemblies injected a per-request scoped object into a singleton-scoped object. […] Read more...

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How to implement and register a custom dependency resolver in ASP.NET MVC 5

March 6, 2015, (updated on March 26, 2015), Software Development

The ASP.NET MVC 5 framework supports the integration of 3rd party dependency injection frameworks. This can be done by implementing the IDependencyResolver interface and registering an instance of the interface on application startup. The registration is made in the Application_Start method which can be found in the Global.asax.cs file: protected void Application_Start() { ... var compositionContext = new CompositionContext(); compositionContext.AddPart<IMyService, MyServiceImpl>(); // TODO: Register your own services here DependencyResolver.SetResolver(new MyDependencyResolver(compositionContext)); } Most dependency injection frameworks provide a NuGet package which already contains an IDependencyResolver implementation (for example Ninject.MVC3). However, because I wanted to use the IoC container from my own […] Read more...

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