Development @ msnbc.com - dependency-injection

Aug

2011

6:44pm, EDT

NinjectMVC3: Dependency Injection in 30 seconds or less

I'm frequently baffled by the hoops one must go through in order to setup things like dependency injection in a web app. While browsing through Ayende's Raccoon Blog source code, I noticed he avoided using IoC and instead created a helper class to manage store/session lifetimes. Seemed like more work than I wanted to do.

Instead of spending time avoid the IoC setup pain, I took Ninject.MVC3 for a test drive. It went something like:

Use Nuget to get Ninject.MVC3
Edit RegisterServices -- the Nuget package conveniently adds some code in the App_Start folder so you don't have to worry about the boiler plate. In this case, I wanted to pass a controller an instance of IDocumentStore for RavenDB:

Code Snippet

private static void RegisterServices(IKernel kernel)
        {
            kernel
                .Bind()
                .To()
                .InSingletonScope()
                .WithPropertyValue("Url", "http://localhost:8080")
                .OnActivation(store => store.Initialize());
        }

3. Use IDocumentStore in my controllers.

Code Snippet

IDocumentStore store;
 
public AdminController(IDocumentStore store)
{
    this.store = store;
}

By Bryan Wheeler

Pretty slick.