Unity: How to remove(unregister) registered instance from Unity mapping.

Question

Hello, I meet one problem that i can't solve now. I have the following:

UnityHelper.DefaultContainer.RegisterInstance(typeof(IMyInterface), "test", instance);

where UnityHelper.DefaultContainer is my helper for getting unity container with loaded configuration.

here I registered instance as an instance of IMyInterface.

So anywhere(some time after using) I want to remove this mapping. Remove it at all. How I can do it?

I have tried

UnityHelper.DefaultContainer.Teardown(instance)

but is was unsuccessfull and the following code returns instance anyway.

UnityHelper.DefaultContainer.ResolveAll()

Any ideas?
Thank you.

Answer 1

Hello! I think that is what you are looking for.

var lifetimeManager = new TransientLifetimeManager();
UnityHelper.DefaultContainer.RegisterInstance(typeof(IMyInterface), "test", instance, lifetimeManager);
lifetimeManager.RemoveValue();

Answer 2

I had a similar requirement whereby I wanted to temporarily store objects in the unity container and found this was not possible (or at least easily possible). If your objective is to have a temporary storage place easily available to unity, then create a temporary storage service.

public class TemporaryStorageService : ITemporaryStorageService
{
    public void Deposit<T>(Object o, string key)
    {
        System.Windows.Application.Current.Properties[key] = o;
    }

    public T Withdraw<T>(string key)
    {   T o = (T)System.Windows.Application.Current.Properties[key];
        System.Windows.Application.Current.Properties.Remove(key);
        return o;
    }
}

Register your service with Unity. Then when you wish to store an object you call the Deposit Method and when you wish to remove the object you call the Withdraw method. A fuller explanation can be found here