How to remove(unregister) registered instance from Unity mapping?

Question

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

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


        

Answer 1

Here is how I handled unregistering instances from a unity container

I needed to implement Add/Remove functionality like this:

public interface IObjectBuilder
{
    void AddInstance(T instance);
    void RemoveInstance(T instance);
}

I created a custom lifetime manager to do the implementation

public class ExplicitLifetimeManager :
    LifetimeManager
{
    object Value;

    public override object GetValue()
    {
        return Value;
    }

    public override void SetValue(object newValue)
    {
        Value = newValue;
    }

    public override void RemoveValue()
    {
        Value = null;
    }
}

Here is the final implementation:

    Dictionary Instances = new Dictionary();

    public void AddInstance(T instance)
    {
        ExplicitLifetimeManager e = new ExplicitLifetimeManager();
        Instances[instance] = e;
        Container.RegisterInstance(instance, e);
    }

    public void RemoveInstance(T instance)
    {
        Instances[instance].RemoveValue();
        Instances.Remove(instance);
    }

calling removevalue on the custom lifetime manager causes the instance to be unregistered