unable to Calling GetService for each request in Core API

Question

With Microsoft.Practices.Unity, the GetService method of IDependencyResolver in Asp.Net webAPI is called for each request, where i can do the below(user specific resolving of container)

public UnityDependencyResolver(IUnityContainer container)
    {
string userKey = GetUserFromContext();

        if (_container != null)
        {
            if (_container.ContainsKey(userKey))
                _container[userKey] = container;
            else
                _container.Add(userKey, container);
        }
        else
        {
            _container = new Dictionary<string, IUnityContainer>();
            _container.Add(userKey, container);
        }

}

public object GetService(Type serviceType) {

            string userKey = GetUserKey();
            return _container[userKey].Resolve(serviceType);
       
    }

, i want to achieve the same in Core API. as i need this to show container data specific to user. now two user across global can see data of each other

Note: Cannot use default DI of Core API

Kindly help Thanks

tried below but no luck Custom unity Unity