Prism.Ioc Container

[Midnayt]

@brianlagunas Is it possible to cleare registered singltons? f.e. I have a few servers with different data wich can be stored at interfaces and when logout I need to cleare that, because when I'll choose another server some info will be restored from previous server.

[brianlagunas]

well, usually you wouldn't need to "clear" a registration. Instead you would update the instance to point to the correct server. Or you could replace the instance with another instance.

[xusan]

Hi @brianlagunas
How to Replace instance ?

[sylvesp]

My understanding is that there is no general way to replace instances.
You have to write code specific to your IoC container.
In my Prism app I am using DryIoC and the code to replace instances is:

//*** DryIoc specific ***
   ContainerLocator.Container.GetContainer().RegisterInstance(typeof(IBIMrxApplicationSettings), _commonSettingsEx, IfAlreadyRegistered.Replace);
//*** End DryIoc specific ***

[sylvesp]

Ah! Sorry. I missed a key word in there, and that is "Singleton"
In my scenario I have to replace non-singleton registrations.
E.g:

• For a given interface there is a default implementation registered on startup
• The user chooses one of the multiple possible enhancements => We replace the registration of the interface with the enhnced implementation the user did choose.

As long as I know Prism doesn't allow the replacement of non singleton registrations - but as said earlier I may be wrong on this.
For now I am using container specific code to replace non-singleton registrations.

[brianlagunas]

Prism has always allowed you replace any registration. This actually isn’t even a Prism thing. It’s a container thing. The replacement behavior depends on the container you’re using.

[sylvesp]

:) so I am not going mad after all
What Brian said is exactly what I've posted in my original reply: If you want to replace non-singleton registration then you have to use container specific code.

//*** DryIoc specific ***
   ContainerLocator.Container.GetContainer().RegisterInstance(typeof(IBIMrxApplicationSettings), _commonSettingsEx, IfAlreadyRegistered.Replace);
//*** End DryIoc specific ***

Wish everybody a nice weekend.

[brianlagunas]

You are going mad 🤣. You don’t need to use container specific code. Look at the code linked above and scroll down to see the standard register method. It uses replace 😁

[sylvesp]

Will do it tomorrow. Promise! it is too late for such a delicate thing!
:D