Question

Previously I registered dependencies in IoC container at application start setting controller factory. But now I need to register some dependencies per request. Are there any ways to make it in ASP.NET MVC 3?

Answer 1

Generally, even every basic IoC container supports object lifecycle management in some way.

My favorite container is Ninject 2.0 which seemlessly integrates with ASP.NET MVC 3. It’s available as a NuGet package called Ninject.MVC3.

In the RegisterServices(IKernel) method, you can define a scope for each type to resolve. The following code configures Ninject to return the same single instance of SomeImplementation when ISomeInterface is being resolved:

/// <summary>
/// Load your modules or register your services here!
/// </summary>
/// <param name="kernel">The kernel.</param>
private static void RegisterServices(IKernel kernel)
{
    kernel.Bind<ISomeInterface>().To<SomeImplementation>().InRequestScope();
}

Ninject lets you choose from one of the following available scopes:

• InRequestScope()
• InThreadScope()
• InSingletonScope()
• InTransientScope()

Nate Kohari wrote a blog post about that topic called Cache-and-Collect Lifecycle Management in Ninject 2.0 — you would definitely want to check that out!