Unity has CreateChildContainer, is there equivalent in SimpleInjector or LightInject

Question

We're in the process of evaluating SimpleInjector and LightInject to replace our current Unity implementation in our application. Unity has a method that allows a hierarchy of containers with a call to CreateChildContainer(). Is there an equivalent for SimpleInjector and LightInject?

Answer 1

LightInject uses the PerScopeLifetime and the PerRequestLifetime for this.

PerScopeLifetime creates just one instance of a given service per scope and disposes the service instance at the end of the scope if it implements IDisposable.

PerRequestLifetime creates new instances for each request (GetInstance) and disposes all instances at the end of the request.

The scope itself is started using the BeginScope method.

PerScopeLifetime

container.Register<IFoo, Foo>(new PerScopeLifetime());
using(container.BeginScope())
{
    var firstInstance = container.GetInstance<IFoo>();
    var secondInstance = container.GetInstance<IFoo>();
    Assert.AreSame(firstInstance, secondInstance);
} //<- Instances implementing IDisposable are disposed here.

PerRequestLifetime

container.Register<IFoo, Foo>(new PerRequestLifetime());
using(container.BeginScope())
{
    var firstInstance = container.GetInstance<IFoo>();
    var secondInstance = container.GetInstance<IFoo>();
    Assert.AreNotSame(firstInstance, secondInstance);
} //<- Instances implementing IDisposable are disposed here.

Normally the BeginScope method is something that is called by the various extensions available to LightInject.

Examples of this can be found in LightInject.Web, LightInject.Mvc and LightInject.WebApi.