How to get an instance of a registered service in prism 8?

[josdemmers]

Moved from Prism unity 7.2.0.1422 to 8.1.97.

In 7.2.0.1422 I could do this:

aContainerRegistry.RegisterSingleton<IBroker, GreefaBroker>();
aContainerRegistry.GetContainer().TryResolve<IBroker>().Init(lSettings.From);

Allowed me to initialize the broker with an address once the settings are available.

However, now in 8.1.97 there no longer is a TryResolve.
The closest thing I found is something like this:

(aContainerRegistry.GetContainer().Resolve(typeof(GreefaBroker), typeof(GreefaBroker).FullName) as GreefaBroker)?.Init(lSettings.From);

But looks like that gives me a new instance. Because when I use the registered IBroker service afterwards the initialized property is null again.

How should I call Init() of GreefaBroker in prism 8?

[brianlagunas]

This is not a prism question. It actually has nothing to do with Prism. This a Unity Container question. GetContainer() returns the container, which means you are working directly with the container itself.

[josdemmers]

Sorry for mixing that up. Thought it was all part of the prism library.

[dansiegel]

So first of all any time you call GetContainer() you're working with the underlying container (i.e. Unity Container or DryIoc). TryResolve was never part of Prism's API.

That said what I would recommend is something like the following:

containerRegistry.RegisterSingleton<IBroker>(c => 
{
    var broker = c.Resolve<GreefaBroker>();
    broker.Init(lSettings.From);
    return broker;
});

You do not explicitly need a registration for GreefaBroker as it is a concrete type, this means that by default the container will resolve this as a Transient. Using the delegate / factory extension as shown above you can initialize the instance before returning it for the IBroker registration

[josdemmers]

Great, thank you for the explanation.
Tried the above suggestion to initialize an instance and it works great.